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WATER PURIFICATION See Also: water purification Water purification is the removal of contaminants from Raw Water to produce Drinking Water that is Pure enough for human consumption. Substances that are removed during the process of '''drinking water treatment''' include Bacteria , Algae , Virus es, Fungi , Mineral s, and man-made chemical Pollutants . Many contaminants can be dangerous—but depending on the quality standards, others are removed to improve the water's smell, taste, and appearance. A small amount of disinfectant, known as a disinfectant residual, is usually intentionally left in the water to reduce the risk of re-contamination in the distribution system (chlorine and chloramine are commonly used for this purpose). SEWAGE TREATMENT See Also: sewage treatment Sewage treatment is the process that removes the majority of the contaminants from waste-water or Sewage and produces both a liquid effluent suitable for disposal to the natural environment and a Sludge . To be effective, sewage must be conveyed to a treatment plant by appropriate Pipes And Infrastructure and the process itself must be subject to Regulation And Controls . Other wastewaters require often different and sometimes specialised treatment methods. At the simplest level treatment of sewage and most wastewaters is through separation of solids from liquids, usually by settlement. By progressively converting dissolved material into solid , usually a biological floc and settling this out, an effluent stream of increasing purity is produced. OTHERS (SUMMARIES STILL TO BE ADDED)
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