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The range of temperature at which mesophilic microorganism becomes active in sludge digester is ___________

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The range of temperature at which mesophilic microorganism becomes active in sludge digester is ___________

(a) 30-40^oC

(b) 10-40^oC

(c) 20-50^oC

(d) 20-40^oC

I had been asked this question in homework.

The above asked question is from Digestion of Sludge, Sludge Digestion Tank topic in division Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Correct option is (d) 20-40^oC

For explanation: The mesophilic microorganism becomes active at 20-40^oC in the sludge digester. The rate of digestion, increases with increase in temperature.

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