The purpose of pre-chlorination in the water treatment process is to oxidize dissolved iron and manganese, control algae growth, reduce taste and odor problems, assist in coagulation, and reduce the biological load before subsequent treatment steps. Pre-chlorination involves adding chlorine to the raw water before it enters the main treatment plant. It oxidizes dissolved iron and manganese, converting them to insoluble forms that can be more easily removed by sedimentation and filtration. This prevents staining and discoloration problems in the finished water. It also controls algae growth in reservoirs and other open water sources, preventing clogging of filters and reducing taste and odor problems. Chlorine can react with algal cells, killi....
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