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Waste Water Treatment is the process of removing contaminants from wastewater and household sewage. It includes physical, chemical and biological processes to remove contaminants. Its objective is to produce a stream of treated effluent and a solid waste or sludge suitable for discharge or reuse back into the environment. The micro organisms that breakdown the biological waste require oxygen. Air is also used to prevent the sludge from settling.
In Potable Water Treatment, air is used to back flush filters and for the aeration of reservoirs.
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