Question
How are microbes used in sewage management?

Answer

In cities, the sewage is sent to processing plant and is treated with microbes.
- Microbes that carry out decomposition, are mixed with sewage. Such microbes are able to destroy, pathogens as well as decompose any compounds.
- Some microbes bring about bioremediation of environment, that are used for treating sewage pollution.
- Upon decomposition of the carbon compounds present in sewage, microbes release methane and $\mathrm{CO}_2$.

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