The hea to the activated sludge process is -
The hea of activated sludge process is aeration tank. The effluent from primary sedimentation tank is mixed with sludge drawn from the final settling tank,rich in aerobic bacteria.The mixture is subjected to aeration in aeration chamber for about 6 to 8 hours.During aeration organic matter get oxidised to carbon dioxide,nitrates,and water with help of aerobic bacteria in activated sludge.The typhoid and cholera organisms get destroyed and coliforms are reduced. Parks textbook of preventive and social medicine.K Park. Edition 23. page no:764
Primary sedimentation tank
Sludge digestor
Aeration tank
Final settling tank
Environment and health