Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Environmental Engineering Sewage Sewage Treatment
In secondary treatment of sewage the operation which take places:
1
Removal of heavier suspended inorganic material
2
Removal of fine dissolved organic material
3
Removal of harmful bacteria
4
More than one of the above
5
None of the above