For the sludge digestion system to work effectively, the pH of the slu – McqOptions

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1.	For the sludge digestion system to work effectively, the pH of the sludge should be between:
A.	10 - 12
B.	8.5 - 10
C.	3.5 - 5.5
D.	6.5 - 7.4
Answer» E.

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