What is the environmental hazard or effect associated with water treatment?

Question

include any chemical reactions or chemical changes involved

Answer 1

There is no environmental Hazard associated in the treatment of polluted water., in the conventional method, Ferrous aluminium sulphate is used as the coagulation agent, it removes/seperates the pollutants from the water as a sludge. These sludge will contain Hazardous material depending on the nature of the water that purified. These sludge to be dispossed properly

Answer 2

Probably the effluent quality and discharge location.