state gov TSPSC Polytechnic Lecturer Mock Test 2022 Environmental Engineering Disposing of Sewage Effluents
If Dilution factor is between 150 to 300, then standards of purification required will be
1. Primary treatment such as plain sedimentation should be given to the sewage.
2. Treatment such as sedimentation, screening, and essentially chemical precipitation is required.
3. The sewage effluent should not contain suspended solid more than 150 ppm.
1
1 and 3
2
Only 1
3
Only 2
4
2 and 3