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Secondary sewage treatment is mainly aA. mechanical processB. chemical processC. biological processD. physical process |
Answer» Correct Answer - C In secondary or biological treatment of municipal waste, the organic matter is decomposed with the help of microbes. Decomposition of organic matter occurs by one of the three methods-water hyacinth pond, trickling filter method and activated sludge method. After decomposition the treated water is sterilised through chlorination and recycled. |
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