化学预氧化对微污染水源三氯乙醛生成潜能的影响

Influence of Chemical Pre-Oxidation on Chloral Hydrate Formation Potential of Micro-Polluted Water Sources

以南方某微污染水源为研究对象,分析了二氧化氯、高锰酸钾、过氧化氢、臭氧和臭氧-过氧化氢不同预氧化剂对水体中三氯乙醛生成潜能(CHFP)的影响,以找出合适的预氧化剂及其适宜的投加量,为三氯乙醛(CH)的控制提供指导。结果表明,能够有效降低CHFP的化学预氧化方式依次为高锰酸钾、过氧化氢和二氧化氯,优化投加量分别为0.4、5.0、0.5 mg/L,对CHFP相应的去除率分别为43.66%、23.86%、21.86%;臭氧和臭氧-过氧化氢能够使CHFP含量增加或对其去除作用不明显,不适用于常规工艺中CH的控制。

The influences on chloral hydrate formation potential （CHFP） from different chemical pre-oxldants, chlorine dioxide （ClO2）, permanganate （KMnO4）, hydrogen peroxide （H2O2）, ozone （O3） and ozone/hydrogen peroxide （O3-H2O2,） were studied for a micro-polluted water source in the south of China. Suitable pre-oxidants and corresponding optimum doses were determined to provide guidance for controlling chloral hydrate （CH） formation during drinking water treatment. The results indicated that the pre-oxidants of KMnO4, H202 and C102 could decrease CHFP effectively were, and corresponding optimum doses were 0.4, 5.0 and 0.5 mg/L respectively, and the removal rates to CHFP were 43.66%, 23.86% and 21.86% separately. In addition, 03 and O3-H2O2 were not suitable for controlling CH in the conventional treatment process because they could increase CHFP or not remove CHFP effectively.