The following points highlight the four methods adopted for on-site disposal of sewage. The methods are: 1. Septic Tanks 2. Leaching Cesspools 3. Imhoff Tanks 4. Clarigester. Method # 1. Septic Tanks: A septic tank is a combined sedimentation and digestion tank where sewage is held for one to two days. During this period, the […]