Flocculation kinetics and floc characteristics of dye wastewater by polyferric chloride–poly-epichlorohydrin–dimethylamine composite flocculant
Flocculation kinetics and floc characteristics of dye wastewater by polyferric chloride–poly-epichlorohydrin–dimethylamine composite flocculant
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DOI：
10.1016/j.seppur.2013.08.004
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发表时间：
2013-10
影响因子：
8.6
通讯作者：
Zhonglian Yang;Xin-xin Liu;B. Gao;Shuang Zhao;Yan Wang;Q. Yue;Qian Li
中科院分区：
文献类型：
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作者：
Zhonglian Yang;Xin-xin Liu;B. Gao;Shuang Zhao;Yan Wang;Q. Yue;Qian Li
采用聚合氯化铁-聚环氧氯丙烷-二甲胺(PFC-ECH-DAM)复合絮凝剂，对比研究了不同羟基/铁比、铁与有机环氧氯丙烷-二甲胺质量比和交联剂类型的聚合氯化铁-聚环氧氯丙烷-二甲胺(PFC-ECH-DAM)复合絮凝剂处理印染废水的絮凝过程和絮体特性。考察了羟基铁摩尔比(B值)、铁与ECH-DAM质量比(MR值)、交联剂类型和ECH-DAM投加量对絮凝性能的影响，考察了絮凝剂投加量和印染废水pH的变化规律。结果表明，PFC与ECH-DAM的协同作用促进了较大的絮体的形成，具有较高的生长速率和较宽的絮体尺寸分布。在对活性红(K-2BP)印染废水的混凝处理中，较高的絮凝剂投加量范围(>；80 mg/L)和溶液pH值为7.5左右时，可获得较强的絮凝性能。絮体TWV值表明，PFC-ECH-DAM的主要絮凝机理为桥联吸附和扫掠絮凝。此外，较低的OH/Fe摩尔比、较高的Fe/ECH-DAM质量比以及以多乙烯多胺为交联剂有利于形成较大尺寸、较高生长速率和较大尺寸变化的絮体。
The polyferric chloride–poly-epichlorohydrin–dimethylamine (PFC–ECH–DAM) composite flocculants with different OH/Fe ratios, Fe to organic ECH–DAM mass ratios and cross-linker types were comparatively investigated in terms of formed floc aggregation process and floc characteristics for the treatment of synthetic dyeing wastewater. The effect of OH/Fe molar ratio (Bvalue), Fe to ECH–DAM mass ratio (MR value), cross-linker type and ECH–DAM addition on floc characteristics was investigated as function of flocculant dosage and dye wastewater pH. The results demonstrate that the synergic effect of PFC with ECH–DAM promoted the formation of larger flocs with higher growth rate and wider distribution of floc sizes. During the coagulation of reactive red (K-2BP) dyeing wastewater, strengthened floc properties can be obtained at higher flocculant dosage ranges (>80 mg/L) and solution pH of about 7.5. The floc TWV values appear to show that the predominant flocculation mechanism of PFC–ECH–DAM are bridging adsorption and sweep flocculation. In addition, relatively lower OH/Fe molar ratio, higher Fe to ECH–DAM mass ratio and utilizing polyethylene polyamine as cross-linker were favorable for the formation of flocs with larger size, higher growth rate and larger size variation.