Method for controlling generation of iodo-trihalomethanes in drinking water
The invention relates to a method for controlling generation of iodo-trihalomethanes in drinking water. The method comprises the following steps: (1) regulating the pH value of to-be-treated water to be less than or equal to 9, adding potassium ferrate into the to-be-treated water, stirring for unif...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention relates to a method for controlling generation of iodo-trihalomethanes in drinking water. The method comprises the following steps: (1) regulating the pH value of to-be-treated water to be less than or equal to 9, adding potassium ferrate into the to-be-treated water, stirring for uniformly mixing and reacting; (2) filtering the reacted solution by adopting a natural settling and micro-filtration membrane to obtain iodine-free water; and (3) adding disinfectant into the iodine-free water for disinfecting to obtain drinking water. Compared with the prior art, the method has the advantages that the risk of generating I-THMs in drinking water can be controlled, a complex and long operation process is not required, generation of I-THMs can be avoided under acidic and neutral pH value, I-THMs generated in subsequent chlorination/chloramine can be respectively reduced by 94.5 percent and 84.1 percent when the pH value is 9, and the carcinogenic risk of byproducts caused by disinfection with chlorine a |
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