define the term activated sludge.
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Sewage mixed with bacteria and protozoa that thrive and multiply in it and lead to its oxidation (see biological oxygen demand). Activation reduces the organic pollution that raw sewage otherwise will impose on the body of water to which it is discharged.
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The activated sludge process is a type of wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa.
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