Inderscience Publishers

Trihalomethane reduction in drinkable water by controlled chlorination and use of hydrogen peroxide

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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.

Keywords: ammonia, chlorination, disinfectant, hydrogen peroxide, oxidation, trihalomethane reduction, water treatment plants, drinking water, Italy

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