Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test People Development & Environment Environmental Issues Pollution
Which one of the following is a chemical treatment process of wastewater treatment?
1
Sedimentation
2
Neutralization
3
Aeration
4
More than one of the above
5
None of the above