Subrit mentioned that the waste water from the sewer systems in India hardly ever gets treated. This is unfortunate, as the effluents probably escape into rivers and cause pollution and germ contamination. But it was our (admittedly not very educated) guess that they also emit considerable amounts of methane, which could be burned to carbon dioxide. Because CO2 is a much weaker greenhouse gas than methane, the combustion would be entitled to certificates; also, the occurring heat could be used for electricity production. The methodology for methane recovery in waste water treatment is to be found here.
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from the blog: