Aerobic digestion of sludge takes place in -
Park's textbook of preventive and social medicine 23rd edition. *The effluent from the primary sedimentation tank still contains a propoion of organic matter in solution or colloidal state and numerous living organisms.it is subjected to fuher treatment by filter method activated sludge process.
Trickling filter
Broad irrigation
Activated sludge
Septic tank
Environment and health