铝盐、铁盐和钛盐混凝对三卤甲烷前体物的去除研究

Removal of trihalomethane precursors by coagulation among aluminum,iron and titanium salts

以引黄水库水加标腐殖酸为研究对象,重点对比分析了聚合氯化铝(PAC)、氯化铁(FeCl_(3))、硫酸钛[Ti(SO_(4))_(2)]对三卤甲烷(THMs)前体物的去除效能及控制机理。结果表明,在低投加量下,PAC对THMs前体物的去除效果最好;在高投加量下,Ti(SO_(4))_(2)的去除率最高,并且Ti(SO_(4))_(2)对小分子有机物也能获得理想的处理效果。PAC去除THMs前体物的混凝机理以吸附电中和以及吸附架桥为主,FeCl_(3)、Ti(SO_(4))_(2)的去除机理更多的是依靠网捕卷扫。

The removal efficiencies and control mechanisms of polyaluminum chloride( PAC),ferric chloride( FeCl_(3)) and titanium sulfate on the precursors of trihalomethanes( THMs) are analyzed and compared by using standard humic acid in the water of Yellow River diversion reservoir as the research object. Results indicate that PAC shows the best removal effect on precursor of THMs at low dosage,while titanium sulfate holds the highest removal efficiency at high dosage.Ideal effect can be obtained by using titanium sulfate to treat with small molecule organic matter.The coagulation mechanism of PAC to remove THMs precursors is mainly adsorption electric neutralization and adsorption bridging,while FeCl_(3) and Ti(SO_(4))_(2) rely more on net sweeping.