role of microorganisms in environment cleaning and sewage treatment

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what is the role of microorganisms in environment cleaning,sewage treatment?
asked in Bacteria Kingdom by dhosheka
related to an answer for: What is the role of bacteria in soil fertility?

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some bacteria like azobacteria thipica fertile the soil and some of bacteria fixes the nitrogen in soil which gives fertility to soil some bacteria are chemotrophic which eat them and leave nitrogen or other compounds
answered by prathviraj chawan
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