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通过对东北某江水进行强化混凝试验,研究聚合氯化铝对不同分子质量组分、不同pH值条件下的消毒副产物三卤甲烷生成势(THMFP)、卤乙酸生成势(HAAFP)的影响。结果表明,当聚合氯化铝投加量为2.0 mg/L时,三卤甲烷生成势、卤乙酸生成势均呈现下降的趋势。当pH值为5.0时,水解产物以Keggin-Al_(13)形态为主,对THMFP的去除效果最好,混凝机理以电中和为主。当pH值为8.0时,水解产物以Al(OH)_3、Al(OH)_4~-形态为主,对HAAFP的去除效果最好,混凝机理以吸附架桥、网捕卷扫为主。
The effect of polyaluminum chloride (PAC) on the trihalomethanes formation potential (THMFP) and haloacetic acid generation potential (HAAFP) of disinfection by-products under different molecular weight and pH value was studied through the coagulation and coagulation tests on a river in Northeast China. . The results showed that when the polyaluminum chloride dosage was 2.0 mg / L, the trihalomethane generation potential and haloacetic acid generation potential all showed a downward trend. When the pH value is 5.0, the hydrolyzate is dominated by Keggin-Al_ (13) and the removal of THMFP is the best. The coagulation mechanism is dominated by electric neutralization. When the pH value is 8.0, the hydrolyzate is dominated by Al (OH) 3, Al (OH) 4 ~ - and the removal efficiency of HAAFP is the best. The coagulation mechanism is dominated by adsorption bridging and net catching and sweeping.