Sewage is mixed with microbes that can decompose any compound as well as destroy the pathogens of cholera, typhoid and so on. Then, they generate methane and CO2 by decomposing the carbon compounds found in the sewage. Phenol oxidizing bacteria will also decompose the xenobiotic chemicals in sewage. Afterwards, the sludge that settles down in this process is again used as fertilizer. Water released following the microbial treatment is environmentally safe and the microbes are used for bioremediation of environment polluted due to sewage.
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