Zhou Ling-ling, Zhang Yong-ji, Ye He-xiu, Zhang Yi-qing
National Engineering Research Center for Urban Pollution Control, Tongji University, Shanghai 200092, China.
Huan Jing Ke Xue. 2012 Aug;33(8):2680-4.
Enhanced coagulation effects of four coagulants, such as aluminium sulfate, ferric chloride, aluminium polychloride and poly-ferric chloride, were examined, with an emphasis on pH, turbidity, Ca+ and relative contents of humic acid and fulvic acid. The result showed that the removal efficiency of four kinds of coagulant for humic acid was higher than that for fulvic acid. Compared with aluminium polychloride and poly-ferric chloride, aluminium sulfate and ferric chloride possessed a better coagulation effect. At the coagulant dosage of 40 mg x L(-1), ferric chloride, aluminium sulfate, poly-ferric chloride and aluminium polychloride removed fulvic acid from 10 mg x L(-1) to 3.22 mg x L(-1), 4.34 mg x L(-1), 5.85 mg x L(-1) and 4.86 mg x L(-1) respectively, while the four coagulants removed humic acid from 10 mg x L(-1) to 1.13 mg x L(-1), 2.13 mg x L(-1), 3.44 mg x L(-1) and 2.50 mg x L(-1) respectively in water. At pH between 5.5 and 6.5, aluminium sullfate and ferric chloride had the best coagulation effect. The coagulant had the lower efficiency with increase of organic carbon in water. Especially, the content ratio of fulvic acid and humic acid was above 0.4, the coagulation effect markedly decreased. Turbidity has a little influence on organic carbon removal rate. With the concentration of Ca2+, the removal efficiency of humic acid and fulvic acid increased.
研究了硫酸铝、氯化铁、聚合氯化铝和聚合硫酸铁四种混凝剂的强化混凝效果，重点考察了pH值、浊度、Ca+以及腐殖酸和富里酸的相对含量。结果表明，四种混凝剂对腐殖酸的去除效率高于富里酸。与聚合氯化铝和聚合硫酸铁相比，硫酸铝和氯化铁具有更好的混凝效果。在混凝剂投加量为40mg·L(-1)时，氯化铁、硫酸铝、聚合硫酸铁和聚合氯化铝分别将10mg·L(-1)的富里酸去除至3.22mg·L(-1)、4.34mg·L(-1)、5.85mg·L(-1)和4.86mg·L(-1)，而四种混凝剂分别将水中10mg·L(-1)的腐殖酸去除至1.13mg·L(-1)、2.13mg·L(-1)、3.44mg·L(-1)和2.50mg·L(-1)。在pH值为5.5至6.5之间，硫酸铝和氯化铁的混凝效果最佳。随着水中有机碳含量的增加，混凝剂的效率降低。特别是当富里酸与腐殖酸的含量比高于0.4时，混凝效果明显下降。浊度对有机碳去除率的影响较小。随着Ca2+浓度的增加，腐殖酸和富里酸的去除效率提高。
