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How does primary sludge differ from activated sludge? What type of changes in the sludge are carried out in anaerobic sludge digester?Give the composition

of biogas produced in the sewage treatment plant.Class XIIMicrobes in human welfare


A tank can be filled by one tap in 20 minutes and buy another in 25 minutes wap.in are kept open for 5 minutes and then the second is turned off in how many more minutes is completely filled
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