engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Environmental Engineering Sewage Sewage Treatment
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as:
1
4.5 to 6.0
2
6.5 to 8.0
3
8.5 to 10.0
4
10.5 to 12.0