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During sewage wastewater treatment the processing stages are known as primary, secondary and final effluent.
Primary stage involves the holding of sewage within a tank to allow heavy solids to sink, oil, grease and lighter solids to float; the settled sludge and floating particles are removed by a clarifier or by skimming.
Secondary stage involves the removal of the dissolved and biological matter. This is performed by indigenous waterborne microorganisms and bacteria within a habitat. A separate separation process may be required to remove microorganisms. Tanks are built so if they become overloaded with rainwater the primary and secondary stages are bypassed to ensure systems can cope.�
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