混凝对藻源有机物的去除及其消毒副产物的控制

Removal of Algal Organic Matter and Control of Disinfection By-products by Coagulation

以聚合氯化铝（PAC）为混凝剂，研究了混凝处理对藻源性有机质（AOM）及其典型含氮和非含氮消毒副产物（DBPs）的去除效能。结果表明，AOM主要由分子质量较小、芳香结构较少的有机质组成，经混凝处理后沉淀性能较差，当PAC投加量为15～25mg／L时，对其溶解性有机质（DOC）的去除率为46．8％～51．5％。混凝对不同DBPs前体物的去除能力有较大区别，在混合阶段转速为100r／min、搅拌时间为30s的条件下，随着PAC投加量从10mg／L增加至30mg／L，对1，1-二氯丙酮、1，1，1-三氯丙酮、二氯乙腈和三氯硝基甲烷的去除率都有不同程度的提高，但三氯甲烷在PAC投量为10和30mg／L时的生成量反而高于不投加PAC时的。剧烈的搅拌不利于对DBPs的消减。

The removal efficiencies of algal organic matter （AOM） and typical nitrogenous and non-nitrogenous disinfection by-products （DBPs） by coagulation with polyaluminium chloride （PAC） as the coagulant were investigated. The results showed that AOM with low molecular weight was lack of aro- matic structure, so AOM had poor settleability. When the dosage of PAC ranged from 15 to 25 mg/L, the removal rate of dissolved organic carbon was around 46.8% to 51.5%. However, the removal efficiencies of different DBPs by coagulation had a great difference. In the mixing stage （ 100 r/min and 30 s）, the removal efficiencies of 1,1 -dichloroacetone, 1,1,1-trichloroacetone, dichloroacetonitrile and trichloronitromethane were improved by increasing PAC dosage from 10 to 30 mg/L. On the contrary, chloroform concentration increased when PAC dosage was 10 or 30 mg/L. In the mixing stage, vigorous stirring was not conducive to the reduction of DBPs.