Altex Technologies Corporation Bio Binder Activated Carbon BAC Abstract

BioBinder activated carbon (BAC) is being developed for recovering metals from waste streams. The technology is in the early testing stages of development and, as such, is not commercially available.

Activated carbon (AC) is carbon that has been heated to high temperatures to develop a porous structure. The interior of these pores provides a considerable surface area onto which metals can be adsorbed. The extent to which AC can remove metals is a function of the amount of AC as well as porosity and surface chemistry.

BAC has been formulated to minimize the cost of adsorbent by using waste as its starter material. BAC is made from a mixture of approximately 85% waste coal fines and 15% municipal sewage sludge on a dry basis. Both materials have very low or no cost and have attributes that contribute to good pore development.

According to the vendor, the use of wastes to produce BAC will decrease the amount of waste that must be disposed of. If BAC were used to replace only 10% of conventional AC, some 50,000 tons of BAC would be needed per year. Approximately 78% of the solids are consumed in the process; thus more than 200,000 tons of waste are beneficially used each year by applying BAC.

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