Determination of the disinfectant demand of a water or wastewater is an important consideration in design. It serves as the basis for determining the capacity of disinfection units required, the amount of disinfectant needed, the type of shipping containers, and all appurtenances required for handling and storage.
Disinfectant residuals are used universally in disinfection practice to control addition of disinfectant so as to ensure effective disinfection without waste of chemicals. A measurable disinfectant residual at the consumer's tap is required in many localities. They are also used to control disinfection of domestic and industrial wastes and usually are the sole criteria immediately available to determine whether or not desired objectives are being attained.
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