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Microbes play a dual role when used for sewage treatment as they not only help to retrieve usable water but also generate fuel. Write how this happens ? |
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Answer» Heterotrophic microbes naturally present in sewage are used, and vigorous growth of aerobic microbes as flocs uses organic matter in effluent and reduce BOD of waste water; other kinds of bacteria grow in it anaerobically and digest the bacteria and fungi called flocs (masses of bacteria associated with fungal filaments). As they digest flocs, a mixture of CH4, H2S, and CO2 or biogas is evolved, which can be used as a fuel. |
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