A sewage treatment plant uses natural processes to convert sewage into uncontaminated water thats then discharged into rivers or lakes. There are two types of sewage treatment plants: primary and secondary. Primary plants use screening, settling, and grit removal processes to remove gross solids from the sewage. The remaining sewage moves on to secondary plants where it is treated with chlorine or other chemicals to neutralize contaminants like disease-causing microbes before being discharged d
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