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用腐殖酸1、腐殖酸2及国产富里酸三种腐殖质进行配水试验,研究了混凝对消毒副产物前体物的去除。结果表明:当聚氯化铝投加量为0~12mg/L时,混凝对腐殖酸1、腐殖酸2及国产富里酸的DOC最高去除率分别为74%、75%、18%;SUVA最高去除率分别为64%、62%、19%。混凝可选择性去除腐殖酸来源的消毒副产物前体物,如对其单位DOC的卤乙酸生成势去除率最高为53%,三卤甲烷为45%。这种选择性作用在富里酸配水体系中不显著。混凝对三种腐殖质单位DOC的水合三氯乙醛生成势基本没有影响;二氯乙腈仅来源于富里酸,混凝对其单位DOC生成势最高可降低24%。当原水中富里酸含量较高时,不适合用常规工艺控制消毒副产物生成。
The humic acid 1, humic acid 2 and domestic fulvic acid were used to carry out water distribution test, and the removal of precursors by disinfection was studied. The results showed that when the polyaluminum chloride dosage was 0 ~ 12 mg / L, the maximum removal rates of DOC, humic acid 1, humic acid 2 and domestic fulvic acid were 74%, 75%, 18% ; SUVA maximum removal rates were 64%, 62%, 19%. Coagulation can selectively remove humic acid-derived disinfection byproduct precursors, such as the highest potential generation rate of halogenated acetic acid for its unit DOC of 53%, trihalomethanes of 45%. This selective effect is not significant in the fulvic acid distribution system. Coagulation had no effect on the hydration of chloral hydrate in DOC with three kinds of humus units. Dichloroacetonitrile was only derived from fulvic acid, and coagulation could reduce the DOC generation potential by up to 24%. When the raw water fulvic acid content is high, it is not suitable for the use of conventional process control disinfection by-products generated.