How is sludge treated in a waste water treatment plant
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Sewage sludge treatment describes the processes used to manage and dispose of sewage sludge produced during sewage treatment. Sludge is mostly water with lesser amounts of solid material removed from liquid sewage. Primary sludge includes settleable solids removed during primary treatment in primary clarifiers
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1. the sludge is transferred into a septic tank where anaerobic bacteria as on it
2. the clarified water is shifted to an aeration tank where is pumped into it to allow aerobic bacteria to grow and to consume organic contaminants.
3. bacteria settle down at the bottom as activated sludge.
4. removal of water takes place by sand drying beds.
5. dried sludge is used as manure.
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