The following article will guide you about how to remove refractory organic and dissolved inorganic substances from sewage. Removal of Refractory Organic Materials from Sewage: In the conventional methods of sewage treatment such as activated sludge process and trickling filters various organic materials (measured by BOD) are removed, but these methods are not effective for the removal of refractory organic [...]
The granular-medium filters may be classified according to: 1. The Direction of Flow 2. Types of Filter Beds 3. The Driving Force 4. The Method of Flowrate Control. 1. Direction of Flow: Filters used for the filtration of the sewage effluent may be classified according to the direction of flow as downflow, upflow or biflow filters. Schematics of these three [...]
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 suspended solids settle down to [...]