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In a sludge digestion tank the process of sludge digestion is rapid when the pH value is in the range of | |
A. | 4 - 7 [Wrong Answer] |
B. | 10 - 14 [Wrong Answer] |
C. | 6.8 - 7.2 [Correct Answer] |
D. | 7 - 8 [Wrong Answer] |