Hello Mahesh, couple of ...

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Hello Mahesh,

couple of decades ago I worked on one of the largest slaughter house westewater treatment plant in Canada. The process used is called Returned Activated Sludge. Liquid waste comes from the animal processing floor, rendering plant and plant clean-up and disinfection liquids (bleach).  The wastewatwer treatment plant consists of the following major components: anaerobic lagoon (covered with tallow with few days retention time), aeration tank  (24 - hour retention time) to remove nitrates and phosphorous,  couple of clarifiers and a sludge digestion tower.  At the end waste-water is reclaimed and disinfected before the release in to the environment.