Imhoff
Tank - Imhoff tanks are anaerobic sewage settling tanks. They are actually modification of the septic tank. Though it is differing from, septic tank in physical design and larger size, it functions in a similar way to that of septic tank.
The tank is divided into two sections. The upper section acts as a settling tank. Digestion occur in the lower section where conditions are more anaerobic. Gaseous products are removed by a gas pipe at the top.
The settling compartment is separated from the digestion compartment. Solids move down into the digestion compartment but are prevented from being carried back up into the settling compartment. Stabilized solids are removed from the bottom of the tank.
