Bio-Digester Technology

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Bio-Digester Technology

Bio-digester technology converts human faecal waste into water and gas in an eco-friendly way.

The Nagpur Metro Rail Corporation Limited - NMRCL is planning to install BDT on 36 metro stations, depot and other metro buildings. NMRCL is first Metro Rail in the country emphasising on green technology in the metro rail service. The metro has adopted solar energy to meet its energy requirements. This is second step towards its commitment for eco-friendly technology. Brijesh Dixit, Managing Director of NMRCL, stated that he is working on Swachh Bharat Abhiyan, an ambitious initiative of Prime Minister Narendra Modi to make city more clean and green in future.

Defence Research and Development Organization - DRDO has developed a bio-digester technology to convert human faecal waste into water and gas in an eco-friendly way. The technology has been developed to solve the sanitation problem faced by soldiers in high altitude. This technology is a clean technology that does not pollute ground water and the effluent is water, CO2, and Methane gas. The effluent water is enriched with minerals that is odourless, colourless and free of pathogens and can be used for gardening or recycled for flushing. This technology does not require any electricity and the digestion takes place in an anaerobic environment and in a sealed container due to bacterial activity. There is no sedimentation and therefore, the septic tank does not require evacuation at all. The effluent water is safe and it can be used safely where there is no sewerage or drainage system.

The digester is to be charged with the bacteria enriched inaculom only once at the time of installation and after that the bacteria will self-multiply. The bacteria can survive minimum three months even when the toilets are not in use and will start multiplying when the toilets are back in use. It may be mentioned that human waste disposal in innocuous form is an ever growing problem leading to aesthetic nuisance, threat of organic pollution and several infectious diseases in epidemic proportions due to contamination of ground water and drinking water resources in highly populated cities. This technology has been extended to Indian Railways for on-board treatment of human waste. Hundreds of stainless steel made biodigesters are in operation in different trains of Indian Railway.

Source: The Hitavada

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