Major odor-causing compounds and their control strategies in drinking water of China
The new version of Standards for drinking water quality(GB 5749-2022)has heightens focus on odorants,designating 2-methylisoborneol(2-MIB)and geosmin,two algal-ori-gin odor-causing compounds,as mandatory controls.Dimethyl disulfide and dimethyl trisulfide are also listed in the standard's appendix.Humans are highly sensitive to odors,with some odorants at just 10 ng/L causing unpleasant odor in drinking water.Additionally,conventional water treat-ment processes do not effectively remove most odorants.The new standards introduce substantial challenges for the water supply industry,necessitating urgent enhancements in odor control capa-bilities among water supply enterprises.Since the 11th Five-Year Plan,China embarked on sys-tematic research into drinking water odor issues.The findings reveal widespread odor pollution in drinking water,characterized predominantly by earthy/musty odor from MIB and swampy/septic odor from thioethers,with localized occurrences of chemical odor attributed to cyclic acetals and other compounds.Various odorants require different control techniques.This paper comprehen-sively summarizes the odor characteristics and odor-causing compounds in drinking water of China,and succinctly outlines source control techniques for MIB and categorized control technologies in water treatment plants for various odorants,offering insights and guidance for the water supply in-dustry to tackle drinking water odor challenges.
Drinking waterTaste and odorWater source regulationWater plant control
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