The relative efficiency of ammonia‐chlorine and free residual chlorine in the treatment of lowland river water was studied. The roles of these chemicals in trihalomethane (THM) formation, water disinfection, and zooplankton removal were considered. Use of ammonia‐chlorine reduced THM formation by as much as 80 percent and did not impair water disinfection. Compared with free residual chlorine, ammonia‐chlorine was more effective against Copepoda ( Cyclops ) but less effective against Cladocera ( Daphnia and Bosmina ).
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Mitcham et al. (1983) studied this question.
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