WASTEWATERThe use of which substance can be very effective for removing soluble organic contaminants if used in conjunction with coagulation, sedimentation, filtration and disinfection?A. Potassium permanganate
B. Anionic polymer
C. Sodium hydroxide
D. Activated carbon
Answer: D. If used along with other processes — like activated sludge, enhanced primary treatment, filtration and final disinfection — activated carbon can effectively remove soluble organic material from wastewater. Powdered activated carbon (PAC) can be added to the influent where it adsorbs organic contaminants. As it does so, it settles in clarifiers with other solids and is removed. The use of PAC requires a constant feed as a
