Keywords: ammonia, chlorination, disinfectant, hydrogen peroxide, oxidation, trihalomethane reduction, water treatment plants, drinking water, Italy
Trihalomethane reduction in drinkable water by controlled chlorination and use of hydrogen peroxide
The reduction of trihalomethane (THM) formation in the water treatment process by a controlled chlorination of ammonia and successive quenching with hydrogen peroxide has been studied. The optimum values of the process parameters have been determined with a calculation programme that makes use of the kinetic constants determined with the water to be treated. The obtained data have been verified on a pilot plant built in parallel to a water treatment plant located near Venice, Italy. A good agreement was found between experimental and calculated values. The results confirmed that with a controlled chlorination and use of hydrogen peroxide the concentration values for ammonia in the exit flow are less than 0.3 p.p.m. and the THM formation is reduced from 50-70 p.p.b. to 10-15 p.p.b.