Wastes are treated by a variety of sewage treatment processes that are aimed at reducing the biological oxygen demand and removing nutrients that could cause eutrophication of receiving waters Sewage treatment can involve physical removal of solids (primary treatment); biological decomposition of organic compounds (secondary treatment); chemical, physical or biological removal of other constituents such as heavy metals, nitrogen, and phosphates (tertiary treatment); and disinfection to remove potentially pathogenic microorganisms.
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