Question

Treatment of waste water involves physical, chemical, and biological processes, which remove _______ matter that contaminates waste water.

• A. physical
• B. chemical and biological
• C. both $A$ and $B$
• D. none of the above

Answer 1

The correct option is C both $A$ and $B$

Physical treatment of water includes-filtration, sedimentation, separation etc. Chemical and Biological treatment includes coagulation, flocculation, ion-exchange, absorption, also aerobic treatments and anaerobic treatments. By these treatments, all physical, chemical and biological matter that contaminates wastewater, can be removed