The ingenuity behind the innovation holds the listener’s attention. The septic tank is a combined sedimentation cum digestion tank where household sewage is treated. The lighter solids including grease and fat rise to the surface to form “scum” and the heavier solids settle down in the tank to form “sludge” which is gradually decomposed by bacteria. The liquid waste or effluent goes into the drain field and undergoes oxidation. The baffle helps to reduce the disturbance of the settled sludge and keep the solids and scum in the tank. In the conventional septic tank, two baffles made of concrete are used. However, in Rajesh’s innovation, only one baffle made of PVC pipes is necessary. This circular baffle which consists of three chambers works as a divider and filter.
Link: The system is cost effective, because, instead of a normal septic tank measuring 2.6m by 9m by 1.8 metres costing Rs.10, 000, by using this unit inside, the size of the can be reduced to1.8m by 9m by 1.8 metres. This results in a saving of Rs.3500. Other advantages include a greater capacity for settling, digestion and storage of sludge, the clearer effluent that is relatively free from stench and particles of excreta, and above all the sheer simplicity of the idea.
Manufacturing Capacity: Yes
Problem Scale: Grave Globally