1.

For decomposing the sludge what we use *anaerobicaerobic​

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Explanation:

Many sludges are treated using a variety of DIGESTION techniques, the purpose of which is to reduce the AMOUNT of ORGANIC matter and the number of disease-causing microorganisms present in the solids. The most COMMON treatment options include anaerobic digestion, aerobic digestion, and COMPOSTING.



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