Which water disinfectant prevents the generation of toxic compounds_________________?
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Answer: D. both B & C
Explanation
Ozone and chlorine dioxide effectively destroy waterborne pathogens through powerful oxidation reactions. Neither of these disinfectants reacts with natural organic matter to form harmful trihalomethanes. Using these chemical agents ensures safe drinking water without introducing regulated disinfection byproducts. Chlorine gas commonly reacts with humic substances in raw water to produce suspected carcinogenic trihalomethanes. Ozone is an unstable allotrope of oxygen that decomposes rapidly into harmless diatomic oxygen molecules. Chlorine dioxide is a synthetic gas that acts as a selective oxidizing agent in municipal water treatment.
Modern municipal water treatment plants utilize ozone to control taste, odor, and pathogens simultaneously. Drinking water standards limit halogenated disinfection byproducts to protect public health from chronic toxicity risks. Engineers select alternative disinfectants like chlorine dioxide to comply with stringent environmental protection regulations. Option A produces toxic halogenated organic compounds when reacting with organic precursors present in surface water. Option B correctly identifies ozone, but it is incomplete because chlorine dioxide shares this beneficial attribute. Option C correctly identifies chlorine dioxide, but it is incomplete because ozone also prevents toxic byproducts.
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