Treatment of a surface water was investigated in bench‐scale and pilot‐plant tests that consisted of flocculation, settling, filtration, granular activated carbon (GAC) treatment, and ozonation. Either GAC treatment or ozonation was necessary to meet the color limit of 15 Co–Pt units. Disinfection with a free chlorine residual without formation of high trihalomethane (THM) levels could only be achieved on GAC‐treated effluent. Application of chlorine dioxide resulted in very low THM levels. The required dosage, however, was high unless preceded by GAC treatment. Chloramine could be used as a disinfectant with any of the treatment schemes without resulting in THMs or other known public health problems.
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Argaman et al. (1984) studied this question.
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