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This story is from May 21, 2006
Cooking gas from sewage
Generate cooking gas from sewage water! That is the latest experiment the CPCB has undertaken to generate resources from waste.
The procedure will not only generate methane as cooking gas, but also make the sewage water fit for secondary purposes.
The new procedure, termed Decentralise Waste Water Treatment System (DEWATS), is being initiated at a colony for beedi workers in Kengeri and at a home for mentally retarded in Bannerghatta.
It is also being used by a tea manufacturer in Yeshwantpur and even in a community toilet in Ullaru. "Since the new procedure DEWATS adopts natural methods, like using anaerobic bacteria and upflow movement of sludge in gravel filters, it is far more economical compared with the prevalent, centralised method of treatment," CPCB zonal officer D C Sharma said.
Shortcomings of the centralised system are: Sewage needs to be flown through underground pipes and s a result, the pipelines sometimes are placed as deep as 30 feet at the treatment site.
A lot of power is consumed to pump the sewage from that level. "Considering that the sewers laid by Bangalore Water Supply and Sewerage Board (BWSSB) cover 5,200 km to carry tonnes of sewage every day, a lot of money is required to get the water to the site, apart from the cost of getting it treated," a BWSSB official said.
DEWATS involves three steps. First the sewage is collected in a biogas digester (a pot-shaped structure made of earth, built underground).
The digester is built at a juncture where a locality's or an industry's sewage flows. Then the anaerobic bacteria are released, which convert biodegradable (BOD) mass into methane gas. The gas generated is collected through a pipe.
At this step, almost 75 per cent of BOD is converted into methane gas as the sewage is given an upflow anaerobic sludge blanker treatment.
To decompose remaining 25 per cent of the BOD mass, the sludge is passed through 'planted gravel filter' units. It serves two purposes - that of killing the anaerobic bacteria and also purifying the water.
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