Distillery effluent, which is commonly termed, as raw spent wash is one of the most polluting effluent with very high values of BOD, COD, suspended solids & dissolved solids. This dark brown effluent has great potential of biogas generation, which can be used as fuel and burnt directly in boiler or can be used to generate electricity by burning the same in biogas engines. Anaerobic digestion process is used to convert this high strength wastewater into biogas. The Digester based on CSTR process offered by ProEnergy provides higher treatment efficiency and is considered the best available amongst anaerobic processes. The CSTR system gives consistent and higher biogas production. It is not only the most reliable system but extremely easy to operate, as well.
“CSTR” process being offered by ProEnergy is based on the concept of conversion of organic matter into biogas. The process of conversion of organic matter into biogas occurs through a group of bacteria. In ‘‘CSTR’’ process, which is a high rate process, anaerobic digestion takes place in the mesophillic range of temperature, i.e. 36o – 40°C. The pH inside the reactor is usually kept around 7.2 while proper ratio of volatile acid and alkalinity is maintained. In CSTR process the bacteria responsible for digestion process are kept in suspension with the help of Lateral as well as central Agitators. .
Biogas will be collected at the top of the reactor and will be stored in a gasholder separately constructed. Biogas holder is fabricated in MS plated and shall be of floating type. Biogas from biogas holder will be compressed and sent to boiler for burning. Flare stack is provided to flare the excess biogas.