Sources of Arsenic in Soil
Arsenic occurs naturally as an element, ranks as the 20th most occurring trace element in the earth's crust (NRC 1977) and is widely distributed in the environment. The ultimate source of arsenic on the Earth's surface is igneous activity (Nriagu 1994). Arsenic is widely spread in the upper crust of the Earth, although mainly at very low concentrations, with arsenic concentrations in soil ranging from 0.1 to more than 1,000 ppm (mg kg-1). In atmospheric dust, the range is 503,400 ppm.
The Health Effects of Dioxins Furans and PCBs
Over a billion dollars has been spent on research to determine the extent to which dioxins, furans, and PCBs cause toxic reactions in humans. Nevertheless, conclusions about this issue are still tentative and controversial. Evidence about toxicity is derived from two sources toxicological experiments on animals that have been deliberately exposed to the chemicals and epidemiological studies of humans who have been accidentally exposed. It is generally agreed that most PCBs are not acutely toxic...
Leading Countries Using Desalination
According to the 2010 UN-Water Global Annual Assessment of Sanitation and Drinking-Water 1 , around 1.1 billion people in developing countries have inadequate access to water, while 2.6 billion lack basic sanitation. Close to half of T. G. Hurd S. Beyhaghi M. Nosonovsky (& ) Department of Mechanical Engineering, College of Engineering and Applied Science, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA e-mail nosonovs uwm.edu M. Nosonovsky and B. Bhushan (eds.), Green Tribology,...
Self Lubricating Behavior of Silver Graphite Composites
Several metal matrix composites have been designed for use in electrical contacts by combining constituents which impart excellent wear resistance with constituents which have high electrical conductivity. Apart from copper base-graphite composites, another composite which is widely used in this field include silver base-graphite composites. The friction and wear behavior under sliding in the Fig. 17.21 Variation of wear loss with sliding distance as function of a normal load, and b current 47...
Macrocyclic Musk Compounds
The development of the macrocyclic musk compounds began in 1926 with the structural characterization of muscone and civetone by Ruzicka and others 15, 22,24-26 . They demonstrated the compounds to be cyclic macromolecules, the existence of which had been considered impossible according to the so-called Baeyer's strain theory 3,15,56 . After this breakthrough additional macrocyclic compounds exhibiting musklike odors were isolated from natural materials, their structures were elucidated, and...
Binary Mixtures
Binary mixtures of miscible liquids such as Water and ethanol are of interest because of the differences in vapor pressure that they exhibit and the influence that vapor pressure has upon their separation by distillation. All mixtures fall into one of three classes, and their properties are considerably different. Class 1 includes all mixtures with total vapor pressure, regardless of the composition of the mixture, that is always less than that of the most volatile component and always more...
Synthetic Musks in House Dust
Fachbereich Chemie, Carl von Ossietzky University Oldenburg, PO Box 2503,26111 Oldenburg, Germany E-mail werner.butte uni-oldenburg.de Abstract House dust is a sink and repository for semi-volatile organic compounds and particle bound organic matter. Although data are available on the occurrence of pesticides, plasti-cizers, endocrine disrupters, and other organics that are persistent in house dust, reports on analytical methods and concentrations of synthetic musks in house dust are limited....
Synthetic Musks in Ambient and Indoor Air
Roland Kallenborn1 Robert Gatermann2 1 Norwegian Institute for Air Research (NILU), The Polar Environmental Centre, NO-9296 Troms0, Norway 2 Dr. Wiertz - Dipl. Chem. Eggert - Dr. J rissen GmbH Analytical Laboratory (WEJ), Stenzelring 14b, 21107 Hamburg, Germany Abstract For the first time, the presence of synthetic musks is confirmed and investigated in air samples. New analytical methods are described developed for the purpose of ultra trace analysis of synthetic musks in low contaminated...
Oganotin Compounds
Abarnou A, Avoine J, Dupont JP, Lafite R, Simon S (1987) Role of suspended sediments on the distribution of PCB in the Seine Estuary (France). Cont Shelf Res 7 1345-1350 Alderton DHM (1985) Sediments. In Historical monitoring, MARC Monitoring and Assessment Research Centre, Technical report no. 31, ISBN 0-905918-28-2, University of London Alexander CR, Smith RG, Calder FD, Schropp SJ, Windom HL (1993) The historical record of metal enrichment in two Florida Estuaries. Estuaries 16(3B) 627-637...
Hausdorff Measure and Dimension
Of all the dimensions of sets, the one introduced by Hausdorff 25 is undoubtedly the most useful for characterizing nowhere-differentiable sets. Familiarity with its definition, and with its limitations, is essential to understanding the concept of fractals. To understand the mathematical background of the Hausdorff dimension, it is useful to first consider as an illustration the process of measuring the 'size' of a set of points defining a surface in three-dimensional Euclidian space R3...
Definition of Contact Angle Youngs Equation
Wetting is the process of making an interface between a solid and a liquid. The primary parameter for a liquid wetting a solid is the angle at which the liquid-vapor interface meets the solid-liquid interface, called the static contact angle h as seen in Fig. 8.6. In this figure, h is the angle between the solid surface and the tangent to the liquid-vapor interface. ySG, ySL, and yLG are solid-vapor, solid-liquid and liquid-vapor interfacial energies respectively. At the equilibrium, Young's...
Solid Waste Collection
Collection cost has been estimated to represent about 60 to 75 percent of the total cost of solid waste management, depending on the disposal method. Because the cost of collection represents such a large percentage of the total cost, the design of collection systems must be considered carefully. The type of service provided, the frequency of service, and the equipment used for collection are considered in the following discussion. The type of collection service provided will depend on the...
Cadmium Metal Detoxification and Hyperaccumulators
Increasing anthropological practices have led to the addition of a highly toxic metal, cadmium, into the natural environment that affects the overall growth and metabolism of plants (Shah and Dubey 1998 Agrawal and Sharma 2006 Shah and Nongkynrih 2007). Cadmium toxicity can elicit a variety of adaptive responses that have been comprehensively reviewed by Toppi di Sanita and Gabbrielli (1999). Bioaccumulation of such toxic metals in the plants poses a risk to human and animal health (Wang et al....
Temkin Isotherm Model
The values of qe versus ln Ce were plotted so that linearised form of Temkin model is obtained in the form of qe A B ln Ce, whereby A is the y intercept and B is the gradient. The linearised Temkin model are illustrated in Figs. 30, 31, 32, 33, 34 and 35 followed by a summary Table 9 that gives the calculated values of the Temkin parameters. The R2 values obtained from the linear method were above Fig. 30 The linearized Temkin model of RR158 by CAC's. Experimental conditions room temperature...
Freundlich Model
The values of the Freundlich constants determined from the graphs displayed in Figs. 18, 19, 20, 21, 22 and 23 are given in Table 7. The high correlation Table 7 Langmuir and Freundlich constants of RR158 adsorption on CAC's Table 7 Langmuir and Freundlich constants of RR158 adsorption on CAC's Fig. 18 The linearised Freundlich isotherm for RR158 on CAC's. Experimental conditions at room temperature, 200 rpm, adsorbent dosage 7.5 g L Fig. 18 The linearised Freundlich isotherm for RR158 on...
Zinc Cadmium and Mercury
Zinc, cadmium, and mercury make up one family of the periodic table. These three elements are representative metals possessing two valence electrons. Their position in the periodic classification immediately follows the transition series, and in keeping with the usual periodic trends, they have comparatively high electronegativity values for metallic elements and form bonds with non-metals of significant covalent character. The covalent properties are emphasized on going down the family from...
The Nature Of The Bod Reaction
Studies of the kinetics of BOD reactions have established that they are for most practical purposes first-order in character (see Sec. 3.10), or the rate of the reaction is proportional to the amount of biodegradable organic matter remaining at any time, as modified by the population of active organisms.
Methods Of Determining Volatile Acids
Two methods of deteimining volatile acids are currently described in Standard Methods. One uses column-partition chromatography, and the other involves distillation. Several laboratories today also use gas chromatography or ion chromatography (Sec. 12.4) for the measurement of the concentration of individual volatile acids, although these procedures are not yet considered as standard. They may be in the future as we leam more about the significance of individual volatile acids in the control of...
Aliphatic Hydrocarbons
Aliphatic hydrocarbons are straight chain and branched-chain structures (see Chap. 1). Most aliphatic hydrocarbons introduced into the environment come from industrial solvent waste, the petroleum industry, and vehicular traffic. Liquid aliphatic hydrocarbons readily degrade under aerobic conditions, especially when the number of carbons is between 8 and 16. Longer chain aliphatic compounds are usually waxy substances. Biodegradation of these longer carbon chains is slower due to limited water...
Additional Problems Uud
A sample of acidic precipitation is found to have a pH of 4.2. Upon analysis it is found to have a total sulfur concentration of 0.000010 M. Calculate the concentration of nitric acid in the sample, and from the ratio of nitric to total acid decide whether the air sample probably originated in eastern or in western North America. 2. If the pH of rainfall in upstate New York is found to be 4-0, and if the acidity is half due to nitric acid and half to the two hydrogen ions released by...
Uncatalyzed Ozone Destruction
5.2.3.1 Ozone in a Clean Stratosphere Below 100 km into the midmesosphere region, the three-body recombination of O atoms, reaction (5-21), becomes potentially important because of the increasing total third-body pressure. However, the O2 concentration is also increasing as we go to lower altitudes, increasingly leading to absorption of the solar radiation below 243 nm. Photodissociation of O2 is decreased, lowering the O atom concentration. Since the rate of reaction (5-21) varies as the...
The Saturated Zone and the Water Table
Infiltrating water settles by gravity, reaching a depth at which all voids in the ground are filled with water. This portion of the ground is called the saturated zone. The water in this zone forms a continuous medium interwoven with the solid matter system. The water in the saturated zone settles with a smooth horizontal upper face, called the water face, or water table. By analogy, water poured into a vessel settles with a smooth horizontal upper face a miniature water table.
Mechanical Vapor Compression
Vapor compression systems are divided into two main categories mechanical vapor compression (MVC) and thermal vapor compression (TVC) systems. In MVC and TVC plants, vapor is produced from the saline solution then compressed thermally, or mechanically, to generate additional production. VC units were first used in naval vessels powered by diesel engines during WWII 22 . A number of MVC-based desalination plants are installed worldwide shortly after, producing fresh water for industrial and...
Wave Energy Collectors
Another type of hydropower devices is the wave energy collector (WEC). The momentum of the movement of water bodies is a significant resource for energy harvesting. Ocean waves present a form of consistent energy by winds passing over open water. It has been demonstrated that capturing wave energy in Table 21.1 Classification of wave energy collectors Attenuators Long multi-segment devices Overtopping Large reservoirs filled then released, devices gravity then pulls water to harness Point...
Metadisciplinary Approaches
We have written in the past about the emergence of the new metadiscipline of sustainability science and engineering. The prefix meta refers to after and beyond, thus, a metadiscipline is a higher level discipline. Unlike interdisciplinary approaches that focus on activities at the interface between disciplines, we called this new field a metadiscipline approach because it provides an over-arching framework for adopting and incorporating knowledge across many fields of study to inform human and...
Bunter Sandstone Aquifer Eastern England
The Bunter sandstone aquifer has been studied over an area of 2000 km2 in eastern England (Fig. 11.18). A large body of data has been published by Andrews and Lee (1979) and Bath et al. (1979). The regional geology, shown in Fig. 11.19, reveals a sequence of formations from the Permian in the west to the Jurassic in the east, the strata dipping eastward. A more detailed geology of the study area, with sampled well locations, is given in Fig. 11.20, and a cross-section is given in Fig. 11.21....
Palladium Catalysis for the Treatment of Contaminated Waters A Review
Stanford University, Stanford, CA 94305-4020 Key words Palladium, catalysis, halogen, remediation Abstract The widespread contamination of waters by halogenated and unsaturated hydrocarbons (e.g. solvents and pesticides) has spurred the investigation of a number of remediation technologies. Treatment via reductive dehalogenation and hydrogenation with Pd catalysts shows promise, offering a number of advantages over other processes. First, a broad range of compounds are reducible in aqueous...
Steinkopff Prize 1993 recipient Duan Vudelic
Dusan Vucelic was born July 17, 1938 in Belgrade, where he completed a Master of Science degree at the Faculty of Physical Chemistry of Belgrade University in 1964. In 1970, he received his doctorate in Physical Chemistry, his thesis being NMR Relaxation of Molecules at Interphases, a field with only a few publications at that time. Subsequently, he became assistant professor of solid state physical chemistry at Belgrade University. Since 1981, Dusan Vucelic has held a full...
Significance Of Chloride
Chloride in reasonable concentrations is not harmful to humans. At concentrations above 250 mg L it gives a salty taste to water, which is objectionable to many people. For this reason a secondary standard of 250 mg L for chloride in drinking water has been set by the U.S. EPA, the same value contained in the WHO guidelines. In many areas of the world where water supplies are scarce, sources containing as much as 2000 mg L are used for domestic purposes without the development of adverse...
GSR glutathione conjugate of the pollutant
Glutathione-conjugation reaction of a pollutant containing an X' leaving group. GSTs represent a family of enzymes with usually broad and overlapping substrate specificities, which facilitate the above reactions of hydrophobic, electrophilic substrates. Our knowledge on plant GSTs in trees has expanded greatly in recent years. Evidence is accumulating on the regulation of gene expression, molecular characteristics, and specific catalytic action of the multiple forms of these enzymes....
Physical Properties of Beeswax and Paraffin Wax
Paraffin wax is a tasteless and odorless, white, translucent solid. The source of paraffin wax is crude oil, which is derived from organic materials. Paraffin wax is produced by refining and de-waxing light lubricating oil stocks. It consists of a mixture of solid aliphatic hydrocarbons of high molecular weight, such as C36H74. Its molecular formula is C H.
Ex Situ Bioremediation Technologies
In many cases, it is necessary to move the contaminated soil or groundwater to a site where a suitable treatment system can be engineered. Contaminated soil may be excavated and moved to landfills to thermal treatment systems, e.g., incinerators or to a variety of bioremediation systems including biopiles, windrows for composting, landfarms, and soil slurry reactors. All have their merits. The choice of which technology to use often is driven by the required performance criteria, i.e., the...
Methods to Remove or Reduce Objectionable Tastes and Odors
Some of the common methods used to remove or reduce objectionable tastes and odors in drinking water supplies, not in order of their effectiveness, are as follows Free residual chlorination or superchlorination Aeration or forced-draft degasifier Application of activated carbon Filtration through granular activated-carbon or charcoal filters Coagulation and filtration of water (also using an excess of coagulant) Control of reservoir intake level Elimination or control of source of trouble...
Peak Demand Estimates
The maximum hourly or peak-demand flow upon which to base the design of a water distribution system should be determined for each situation. A small residential community, for example, would have characteristics different from a new realty subdivision, central school, or children's camp. Therefore, the design flow to determine distribution system capacity should reflect the pattern of living or operation, probable water usage, and demand of that particular type of establishment or community. At...
Ch2o o2 co2 h2o
Some organic matter is partially oxidized to aldehydes, ketones, and alcohols, which give fresh waste its characteristic sweet smell. In the second, anaerobic acid phase, the process of acidic fermentation occurs, generating ammonia, hydrogen, and carbon dioxide gases and large quantities of partially degraded organic compounds, especially organic acids. The pH of the leachate in this phase, 5.5-6.5, is chemically aggressive. Other organic and inorganic substances dissolve in this leachate due...
Lcrs In Environmental Engineering
LCRS Leachate collection and removal system Composite Synthetic liner + Low permeability soil *Based on volume and the physical, chemical, and biological characteristics of the solid waste. FIGURE 3.29 Industrial commercial and ash monofill waste landfill liner configuration. (New York State, 6 NYCRR Part 360, Solid Waste Management Facilities, New York State Department of Environmental Conservation, Division of Solid Waste, Albany, 1990a.) recirculation. Controlled leachate recirculation,...
Landfill Facilities and Equipment for Disposal by Sanitary Landfill
In addition to the control of leachate and landfill gases, a number of other facilities and operating equipment are required for the effective implementation of a sanitary landfill. Personnel requirements are discussed in the following section. Fire Protection The availability of fire protection facilities at a site should also be considered as fire may break out at the site without warning. Protective measures may be a fire hydrant near the site with portable pipe or fire hose, a watercourse...
Insecticides Prior to the Chemical Era
To our knowledge, the first documented compendium of insecticide substances is the Egyptian Ebers Papyrus (ca. 1600 BC).6 Another example of historical reports concerning the control of insect pests can be found in ancient Chinese civilizations, where fire was used to destroy plagues of migratory locust (Locusta migratoria manilensis).7 Pre-Roman civilizations already reported the burning of brimstone (sulfur)6 as an insecticide and purifying agent. Such an application was also described by...
Lipid Water Partition Coefficient
Information on the solute partition behavior in lipid-water mixtures is essential to an understanding of contaminant bioconcentration potentials in natural aquatic environments. Meanwhile, it offers a direct account of a chemical's lipophilicity as well as an important reference to the fish bioconcentration factor (BCF) observed. As before, we select triolein as the model lipid in our analysis of the lipid-water partition coefficient. The preceding section showed evidence that Raoult's law is...
Preparation of Organophosphorus Insecticides
The synthesis of organophosphorus insecticides involves numerous different reactions. In most cases, the preparation starts by treating phosphorous with sulfur or chlorine to give diphosphorus pentasulfide or phosphorus trichloride, respectively. Subsequently, they are transformed into the main intermediates 58-64 depicted in Scheme 2.4.97 As an example, phenyl phosphorothionates 65 can be made by treatment of dialkyl phosphorochloridothionates 64 with phenols in basic medium (see Scheme 2.4)....
Water and Wastewater Analysis 399
9.1 Importance of Quantitative Measurements 401 9.2 Character of Environmental Engineering and Science Problems 402 9.3 Standard Methods of Analysis 402 9.4 Scope of a Course in Analysis of Environmental Samples 402 9.6 Other Items 408 Problems 408 Statistical Analysis of Analytical Data 410 10.2 Rounding Numerical Data 411 10.4 Distribution of Experimental Data 416 10.8 Lognormal Distribution 433 10.10 Quality Assurance and Quality Control 446 11.2 The Analytical Balance 455 11.6 Physical...
Oil Dispersion Technology
Recently, Bayer CropScience has developed a completely new formulation technology O-TEQ (oil dispersion, OD) for foliar application of both imidacloprid (Confidor OD 200)and thiacloprid (Biscaya OD 240).96 98 This formulation type is defined as a stable suspension of ai(s) in a water immiscible fluid, which may contain other dissolved ai(s), intended for dilution with water before use''.99 The main characteristics related to this aspect are outlined in Figure 4.9. O-TEQ can be seen as a vehicle...
High Level Dose
There is no single value for absorbed dose that marks a sharp cutoff between a high-level and a low-level dose of ionizing radiation.69 For each harmful health 69Sometimes an absorbed dose above about 1 Gy is referred to as a high-level dose. The U.S. Nuclear Regulatory Commission refers to a High Radiation Area as one in which an individual effect, there is a range of values of dose within which the severity or the number of occurrences of the effect correlates with the dose in a statistically...
Sanitary Landfill Planning
Key elements in the planning and implementation of a landfill include (1) legal requirements, (2) intermunicipal cooperation, (3) social and political factors, and (4) long-term planning issues. Landfill design considerations are considered in the section following the description of the types of landfills. Legal Requirements State environmental protection agency regulations and local sanitary codes or laws usually build on federal regulatory requirements. A new solid waste disposal location...
Designation of Spectroscopic States
The recipes briefly summarized here are used in arriving at atomic and molecular state (energy) descriptions. The reader is referred to standard textbooks of quantum mechanics and spectroscopy, some of which are given in the Additional Reading, for the mathematical formulations of these principles. The state of the electron in the hydrogen atom or hydrogen-like ion (e.g., He+ and Li2+, each containing only one electron) is specified by the three quantum numbers n, i, and mi. The principal...
Breakpoint Chlorination For Removing Ammonia
Chlorination can be used to remove dissolved ammonia and ammonium ion from wastewater by the chemical reactions NH3 + Cl2 NH2Cl + Cl- + H+. (6.6a) NH4+ + Cl2 NH2Cl + Cl- + 2 H+. (6.6b) Ammonia is converted stoichiometrically to monochloramine (NH2Cl) at a 1 to 1 molar ratio or a 5 to 1 ratio by weight of Cl2 to NH3-N. NHCl2 (dichloramine), and NCl3 (nitrogen trichloride or Suggested Maximum Parameter Levels in Water Used for Crop Irrigation total dissolved solids (TDS) mg L specific...
Isotope analysis of bulk samples
There are two main types of analytical devices used for bulk analyses. Bulk analysis refers to the analyses of the average isotope ratio of the complete sample without prior separation into different fractions. The first device to be developed was the coupling of an elemental analyzer to an IRMS (EA-IRMS) to measure the carbon, nitrogen, and sulfur isotopic composition of bulk samples in liquid or solid form (Giesemann et al. 1994 Matthews and Hayes 1978). A more recent development is the...
Sulfur isotope fundamentals
Sulfate is a major constituent of many surface waters and groundwaters. Identifying potential sources and the biogeochemical history of dissolved sulfate is often of significant interest for water resource managers, since sulfate may cause acidification (Reuss and Johnson 1986), contributes to the hardness of water, and is an important terminal electron acceptor in reductive processes (Appelo and Postma 2005). For the delineation of various sources of sulfate in the hydrosphere, the application...
What Is Integrated Waste Management
There are many different ways of dealing with waste in order to minimise risks to public health and the environment. For many years waste management was carried out in a piecemeal, relatively unplanned way. More recently, experience has shown that a more sustainable approach to society's uses of resources and management of wastes is needed. The term integrated waste management (IWM) is often used to describe an approach in which decisions on waste policies and practices take account of waste...
Unsaturated Alkyl Halides
T0001 3M Company, 3M Empore Extraction Disk T0005 Active Environmental Technologies, Inc., TechXtract T0011 Advanced Microbial Solutions, SuperBio T0012 Advanced Processing Technologies, Inc., Air-Sparged Hydrocyclone T0020 Aeration Basins General T0021 Aeromix Systems, Inc., BREEZE T0025 Akzo Nobel MPP Systems, Macro Porous Polymer (MPP) T0027 AlliedSignal Environmental Systems and Services, Inc., Biological Air Treatment (BAT) System T0029 Alternative Technologies for Waste, Inc., Detoxifier...
Disubstituted and Polysubstituted Benzene Hydrocarbons
T0001 3M Company, 3M Empore Extraction Disk T0011 Advanced Microbial Solutions, SuperBio T0012 Advanced Processing Technologies, Inc., Air-Sparged Hydrocyclone T0021 Aeromix Systems, Inc., BREEZE T0025 Akzo Nobel MPP Systems, Macro Porous Polymer (MPP) T0027 Allied Signal Environmental Systems and Services, Inc., Biological Air Treatment (BAT) System T0039 AMETEK Rotron Biofiltration Products, Biocube Aerobic Biofilter T0048 Aqualogy BioRemedics, Environmental Quality PetroKlenz T0049 Aqualogy...
Benzene Toluene Ethylbenzene And Xylene Btex
T0011 Advanced Microbial Solutions, SuperBio T0021 Aeromix Systems, Inc., BREEZE T0025 Akzo Nobel MPP Systems, Macro Porous Polymer (MPP) T0027 AlliedSignal Environmental Systems and Services, Inc., Biological Air Treatment (BAT) System T0039 AMETEK Rotron Biofiltration Products, Biocube Aerobic Biofilter T0048 Aqualogy BioRemedics, Environmental Quality PetroKlenz T0051 ARC Sonics, Inc., Sonic Reactor (or Sonic Grinder) T0067 Ariel Industries, Inc., Ariel SST Low-Temperature Thermal Desorber...
Trichloroethene Trichloroethylene TCE
T0005 Active Environmental Technologies, Inc., TechXtract T0011 Advanced Microbial Solutions, SuperBio T0012 Advanced Processing Technologies, Inc., Air-Sparged Hydrocyclone T0021 Aeromix Systems, Inc., BREEZE T0025 Akzo Nobel MPP Systems, Macro Porous Polymer (MPP) T0027 AlliedSignal Environmental Systems and Services, Inc., Biological Air Treatment (BAT) System T0029 Alternative Technologies for Waste, Inc., Detoxifier In Situ Steam Hot-Air Stripping Unit T0032 Alzeta Corporation, EDGE...
Polycyclic Aromatic Hydrocarbons Pah Pna Pom
T0001 3M Company, 3M Empore Extraction Disk T0002 7-7, Inc., Liquefication Process T0009 Advanced Environmental Services, Inc., System 64MT Low-Temperature T0011 Advanced Microbial Solutions, SuperBio T0017 Advanced Soil Technologies, Thermal Desorption T0025 Akzo Nobel MPP Systems, Macro Porous Polymer MPP T0034 American Biotherm, L.L.C., Biotherm Process T0035 American Combustion, Inc., Pyretron Thermal Destruction System T0048 Aqualogy BioRemedics, Environmental Quality PetroKlenz T0051 ARC...
Alister Rapid Environment Assessment AUV Autonomous Underwater Vehicle
Thierry Copros and Daniel Scourzic Abstract ECA is mainly known worldwide for its successful PAP family (mine disposal systems). In the late 1970s, ECA designed the first operational AUV, named EPAULARD for IFREMER. Using its know-how gained over the years in designing and building various types of free swimming and inspection underwater vehicles, ECA decided in spring 2003 to develop the A3000, the first inspection AUV with hovering capabilities.
Factor and Atom Economy
Previous sections have outlined the general aspects of evaluation of sustainability, and the value and limits ofthe different methodologies. Even though not exhaustive of the state of the art in this broad topic, which is beyond the scope of this book, the discussion can provide the elements for an evaluation of the specific indexes and methodologies proposed for green (sustainable) chemistry. We also remark that some of the indicators and methodologies discussed in the previous sections do not...
Aqueous Biphase Operations
An excellent example of sustainable chemical processes using homogeneous catalysts is Ruhrchemie Rhone-Poulenc's (RCH RPs) oxo process, which is a prototype of an aqueous biphasic process (Figure 2.3) 65, 66 . The first commercial oxo plant using the RCH RPs biphasic process went on stream in 1984 and has produced over 5 million tons of n-butanyraldehyde (as well as less than 4 iso-butyraldehyde). The oxo-active HRh(CO)4 catalyst is modified by trisulfonated triphenylphosphine (TPPTS) ligands....
Friedel Crafts Acylation of Aromatic Ethers Using Zeolites
RolandJacquot and Philippe Marion 14.1 The Friedel-Crafts reaction and the related Fries rearrangement of aromatics are the most important methods in organic chemistry for synthesizing aromatic ketones, which are of interest in the synthesis of numerous fine chemicals such as drugs, fragrances, dyes and pesticides. The conventional method for preparation of these aromatic ketones involves reaction of the aromatic hydrocarbon with a carboxylic acid derivatives using a Lewis acid (AlCl3, FeCl3,...
Metolachlor and Smetolachlor
Metolachlor or S-metolachlor are commonly used in various crops for control of small-seeded broadleaf weeds, some annual grasses, and yellow nutsedge (Grichar et al., 1996). S-metolachlor will control small-seeded annual grasses, but does provide inconsistent control of large-seeded annual grasses (Grichar et al., 2004a 2004b). Many growers have reported peanut stunting when soil applications of metolachlor have been followed by rain (Grichar et al., 1996). Grichar et al., (1996) reported that...
Indicators Of Fecal Contamination Coliform And Streptococci Bacteria
Detecting and preventing fecal contamination is of prime importance for all drinking water systems and recreation water managers. Fecal wastes may contain enteric pathogens (disease-causing organisms from the intestines of warm-blooded animals) such as viruses, bacteria, and protozoans (which include Cryptosporidium and Giardia). Fecal contaminated water is a common cause of gastrointestinal illness, including diarrhea, dysentery, ulcers, fatigue, and cramps. It also may carry pathogens that...
Effects of Herbicides and Pesticides on Aquatic Life
Pollution to aquatic life is mostly land based and caused by agricultural overspill and waste materials carried by wind. The surface flow can contaminate water sources as 1-6 of the applied pesticides may be lost to the aquatic environment by runoff and drainage depending on the slope of the field, agronomic practices, presence or absence of subsurface drains, and the quantity and timing of rainfall after applications. Sometimes these deposited chemicals react in such a way that they may cause...
Sources of water impurities
A water impurity is any substance other than water (H2 O) that is found in the water sample. Thus, calcium carbonate (CaCO3 ) is a water impurity even though it is not considered hazardous and is not regulated. Impurities can be divided into two classes (1) unregulated impurities not considered harmful, and (2) regulated impurities (pollutants) considered harmful. In water quality analysis, unregulated as well as regulated impurities are measured.
Measuring impurities
There are four characteristics of water impurities that are important for an initial assessment of water quality 1. What impurities are present Are they regulated compounds 2. How much of each impurity is present Are any standards exceeded for the water body being sampled 3. How do the impurities influence water quality Are they hazardous Beneficial Unaes-thetic Corrosive 4. What is the fate of the impurities How will their location, quantity, and chemical form change with time The chemical...
Estimating The Amount Of Residual Lnapl Immobilized In The subsurface
Residual LNAPL in the subsurface is the portion that will not flow into a well. It is the part of an LNAPL spill that cannot be removed by pumping to the surface. Residual LNAPL must be remediated by biodegradation, soil flushing, or excavation. Residual LNAPL is retained in the unsaturated zone by adsorption and capillary forces. Therefore, small soil particles and large surface area both increase the amount of residual LNAPL retained. The soil retention factor (volume of LNAPL per volume of...
Estimating The Amount Of Free Product In The Subsurface
The first steps in the remediation of a site where an LNAPL spill has occurred is to try to limit the movement of contaminant plumes and to remove from the subsurface as much free product as possible. As long as free product is present, it continues to partition into the sorbed, dissolved, and vapor contaminant plumes, continually feeding their growth. Only after the mobile free product has been removed from above the water table can remediation of the contaminant plumes be effective. LNAPL...
The Acid Volatile Sulphides AVS concept
Sulphide, derived form sulphate-reducing bacteria in the pore-water of anoxic sediments, forms relatively insoluble compounds with various trace metals. These metal sulphides can be liberated from wet sediment by treatment with 1 N hydrochloric acid (HCl). Sediments containing an excess of this acid volatile sulphide (AVS) over simultaneously extracted metals (SEM) are characterized by very low pore-water metal concentrations, as well as low metal bioavailability and toxicity. The theoretical...
Steady state or equilibrium
Let us look at an individual trace gas in the atmosphere. We will take methane (CH4), not an especially reactive gas, as an illustration. It is present in the atmosphere at about 1.7 ppm (Box 3.1). Methane could be imagined to react with O2 in the following way CH4(g) + 2O2(g) CO2(g) + 2H2O(g) eqn. 3.2 The reaction can be represented as an equilibrium situation (Box 3.2) and described by the conventional equation which can be written in terms of pressure (Box 3.1) The equilibrium constant (K)...
Aluminium solubility and acidity
Aluminium is largely insoluble during weathering processes (Table 5.1), but becomes soluble when pH is both low and high. At the simplest level, three aluminium species are identified soluble Al3+, dominant under acid conditions, insoluble aluminium hydroxide (Al(OH)3), dominant under neutral conditions, and Al(OH)-, dominant under alkaline conditions. Aluminium solubility is therefore pH-dependent and aluminium is insoluble in the pH range 5-9, which includes most natural waters. The details...
Decay Effects of Pollutants
This section would deal with the sources, pathways and decay mechanisms of the main pollutants affecting materials in the built environment. The diverse pollutants will be discussed in specific sections but here are presented some transversal concepts that are relevant for diverse forms of the polluting substances. In the built environment, water (even in its purest form) can be considered a pollutant as it promotes decay reactions on materials such as paints (Koleske 1995 Wypych 1995) ,...
Structure and Properties of RDX and HMX
(RDX) and (HMX) are two widely used cyclic nitramine explosives. The nitramines are the most recently introduced class of organic nitrate explosives. RDX (Research Department Explosive) and HMX (High Melting Explosive) are the most prominent members of this class. RDX and HMX are considered to be oligomers, (CH2NNO2)n n 3 or 4, respectively of the same repeating structural moiety, CH2NNO2. HMX is a big ring molecule, same as RDX but with an extra CH2NNO2 unit (Fig. 9.1). Research Department...
Sources of Chlorine in Groundwater
Chloride is perhaps the most informative ion from a hydrochemical perspective, as it is common in groundwater, has a limited number of identifiable sources, and is hydrochemically conservative. These properties turn chlorine into a most useful hydrochemical marker. Three basic sources of chlorine in groundwater have to be considered in every case study Rock salt.
Water Table Measurements
The depth of the water table in a well is measured relative to an agreed-upon mark at the top, for example, the edge of the casing. This reference point should be clearly marked to ensure reproducibility of the measurements. The depth of the water table is obtained in meters below the top of the well or, more meaningfully, in meters below the surface, as shown in Fig. 4.1. AC is the depth of the water table below the reference mark at the edge of the well casing (or any other selected mark)....
Calculation of isotope ratios
The IRMS system provides information about ratios of isotopologues (identical molecules with a different isotopic composition) relative to the reference gas from which the isotope ratio of elements in the molecules are calculated. The calculation procedure is discussed in detail for CO2, probably the most commonly measured molecule. The basic information obtained from the IRMS are electrical signals proportional to the amount of ions with specific masses (44, 45 and 46 in case of CO2) reaching...
Biographies
Agardy, Ph.D. is President of Forensic Management Associates, a company focused on environmental litigation support and expert witness services. Dr. Agardy received a B.S. in civil engineering from the City College of New York in 1955, an M.S. in sanitary engineering from the University of California at Berkeley in 1958, and a Ph.D. degree in sanitary engineering from the University of California at Berkeley in 1963. He taught civil and sanitary engineering at San Jose State...
Polanyi Adsorption Potential Theory
If adsorption is highly energetically heterogeneous, as with high-surface-area microporous solids such as activated carbon and silica gel, the adsorption data exhibit serious deviations from the Langmuir model or the BET model. This is because the force field within a pore space (adsorption space) of a micro-porous material that attracts a molecule varies considerably with the location. The Polanyi adsorption potential theory (Polanyi, 1916) has long been recognized as the most powerful model...
Land Occupation and Land Transformation
In LCI, main attention is given to the insight that surface of land is a limited resource. In this sense, land use is included in LCI in the same way as other limited resources, that is, as an input elementary flow. This is the so-called concept of occupancy, where the total area or the area for a certain use (e.g., farm-land or forest) is reported in hectare or some other square measure. The use of land specified in this way is termed as occupation process. As an additional information which...
Enzymes In Soils
The first known report on enzymes in soils was presented by Woods at the 1899 Annual Meeting of the American Association for the Advancement of Science in Columbus, Ohio (1). However, little significant progress occurred in the area of soil enzymology until the 1950s. This was mainly due to a lack of appropriate methodologies and understanding of the true nature of enzymes. Although Sumner first isolated urease in crystalline form from jack bean (Canavalia ensiformis) meal in 1926, for which he...
Biofilm Life Cycle
It is often easier to understand what a biofilm is in terms of the events that lead to its formation. Most studies of biofilms in natural environments have concentrated on events at solid-liquid interfaces, the colonization of a submerged abiotic surface is depicted in Fig. 1. Upon immersion of a nonbiological material, such as glass or silica, the surface becomes coated rapidly with a layer of proteinacous material called a conditioning layer (15-17). Ions and other nutrient sources accumulate...
References and Bibliography
Abdel-Ghani, M.S. and Davies, G.A., 1983, Simulation of Non-Woven Fibre Mats and the Application to Coalescers. Chemical Engineering Science 40 117-129. Ackermann, R., 1961, Inductive Simplicity, Philosophy of Science 28 2 152-61 Adelaide, 2006, Waite Solid-state NMR Facility, University of Adelaide, Australia accessed December 30,2006. Adelman, M.A., 2001, The Clumsy Cartel Opec's Uncertain Future, Harvard International Review, Vol. 23 1 - Spring. Adeoti, O., Ilori, M.O., Oyebisi, T.O., and...
Design of Existing EOR Projects
Due to the lack of rigorous scientific investigation, the designs of EOR projects involving COz or other greenhouse gases have been flawed both technically and environmentally. Flow rates that have been selected in the past are usually high enough to induce viscous fingering, with the only exception being the projects involving injection of gas from the top of an anticline (see Islam et al. 1994 for detail). If this is not the case, viscous fingering will most likely occur, and the entire...
Alkalinity of Maple Wood Ash Extracted Solution
The pH values of maple wood ash extracted solutions at different percentages of maple wood ash (1 , 2 , 4 , 6 , and 8 ) were measured, and the pH values are presented in Table 14.3. It is found that the alkalinity (pH value) of a 6 wood ash solution is close to a 0.5 synthetic sodium hydroxide solution. This value is also very close to the pH value of a 0.75 Na2Si03 solution (Rahman et al. 2006). It was reported that alkaline solutions of the pH range 12-14 were treated as strong bases, as...
Yessotoxins Ytxs
YTXs originally were isolated from the digestive glands of scallops (Patinopecten yessoensis) 106 . Originally classified as DSP toxins as they do not induce diarrhoea YTXs have now been removed from this category 33,34 . The YTXs are sulphonated polyether toxins (Figure 11) and have been reported in shellfish in several countries including, Japan 106 , Norway 107 , New Zealand 108 and Italy 109 . Structurally, YTX is unusual as it is a sulphonated polyether with eleven fused rings 106,110 ....
Food Contaminants Introduction
Phytoplankton are microalgae and are the main contributor to the marine food web as well as oxygen on earth. The beneficial role of algae in the food chain arises from the fact that they are the only organisms that can readily make long chain polyunsaturated fatty acids PUFAs . Shellfish feed on phytoplankton and the potential beneficial role of shellfish in the human diet has been attributed to the presence of oils that are rich in PUFAs. Shellfish are also a rich source of protein, essential...
Microbial Pest Control Agents and Products
The term biopesticide is widely used, and definitions vary. Definitions of the term biopesticide may include microbial organisms, pheromones, insect and plant regulators, plant extracts, transgenic plants as well as macroorganisms. Various institutions have defined biopesticides and sub-sets thereof such as microbial pesticides and microorganisms. Regulatory agencies have provided exact definitions of microorganisms, and for plant protection products containing microorganisms as the active...
Octanol Water Partition Coefficient
The equilibrium distribution of a substance between water and octanol is known as the octanol-water partition coefficient and is often used to predict the expected partitioning in the environment between water and animal plant lipids and water and sediment soil organic matter. There is an abundance of correlations between KOW and measured environmental partition coefficients (e.g. bioconcentration factors, see review by Gobas et al. 46 soil sediment organic carbon-water partition coefficients,...
Synthetic Musks in Drinking Water
The regulations and directives of the EU and the national legislation of the Member States set high standards for the quality of drinking water in terms of chemical and biological,but also organoleptic properties. These latter concern the flavor and odor as criteria for a high-quality drinking water. Studies on the threshold concentrations for the odor of fragrance substances in drinking water also included HHCB and AHTN 37 . The relatively low threshold concentrations of 80 ng L-1 HHCB and 40...
Ongoing Studies
No on-going studies regarding the development analytical methods for the chlorophenols were identified. The international, national, and state regulations and guidelines regarding chlorophenols in air, water, and other media are summarized in Table 7-1. Occupational standards (OSHA) or guidelines (ACGIH) have not been set for any of the eight chlorophenols discussed in this profile. The chlorophenols as a group have been classified as an IARC group 2B carcinogen (IARC 1987). This classification...
What Is Cxvx In Figure
Substitution of the next-to-last equation into the last one gives When we sum the nx values over all phases x of interest, we must obtain the total number of moles. Thus Rearrangement of this equation allows us to calculate the value of the system fugacity An Example of a Fugacity Calculation As an example of how fugacity calculations are carried out in practice, consider the distribution of 1 mole of DDT among three phases air, water, and sediment in a model compartment of Earth (Figure 1). As...
Passive Sampler Fundamentals And Terminology
Until the advent of SPMDs and solid phase microextraction SPME fibers, passive sampling devices were generally limited to integrative diffusion or permeation samplers Fowler, 1982 , with engineered barriers that control uptake rates. The engineered rate-limiting barriers of these classical samplers consist of a structural feature with stagnant air or water diffusional samplers or a nonporous polymeric membrane permeation samplers . In both cases, these barriers are designed to account for gt 90...
Contamination by Polycyclic Musk Compounds
In the mid of the 1990s, Eschke et al. 31-33 reported the first findings of poly-cyclic musk compounds in the aquatic environment and their accumulation in fish from areas contaminated by municipal sewage effluents. Therefore, samples of 476 fishes caught from different surface waters in Berlin were analyzed for six important polycyclic musk compounds 11 to observe the degree of contamination of fish from the Berlin area. These investigations were again commissioned by the Berlin Fishery Board...
Air Water Partition Coefficient
The equilibrium distribution of a substance between air and water is known as the air-water partition coefficient (KAW) and is used to indicate the tendency of a substance to escape from water to air. It is noteworthy that volatility of the pure substance is characterized by vapour pressure. Volatility from water is expressed as Kaw and for volatilisation from organic media KOA is preferred. KAW is more usually measured in the form of a Henry's law constant (H, Pa mol m 3), which can also be...