title: Decolorization of dyeing wastewater and characterization of flocs during coagulation by a new composite coagulant.
abstract: A composite coagulant, polymeric aluminum ferric chloride-poly-epichlorohydrin-ethylenediamine (PAFC-EPI-ETA), was synthesized and then used for the treatment of synthetic reactive brilliant red (RBR) dyeing wastewater. Effects of (Fe+Al) to EPI-ETA mass ratio (P) on the color removal and zeta potential were investigated under different coagulant dosages and initial pHs. Experimental results indicate that the removal of reactive dye and the charge neutralization ability of composite coagulant were improved by increasing the content of organic EPI-ETA. PAFC-EPI-ETA with P=1 achieved the best color removal percentage and strongest charge neutralization ability. Decolorization efficiency using PAFC-EPI-ETA was quite effecient with pH range of 6.0-7.5 for RBR dye removal. Characteristics of the formed floc were investigated with the dosage of PAFC-EPI-ETA under different P values. The low (Fe+Al) to EPI-ETA mass ratio contributed to the formation of flocs with high growth rate, large size and large size variation.
authors.affiliation: School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China E-mail: zhazhb@163.com; Zhibin_Zhangsd@126.com.
authors.forename: Cuizhen
authors.initials: C
authors.lastname: Sun
authors.affiliation: School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China E-mail: zhazhb@163.com; Zhibin_Zhangsd@126.com.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China E-mail: zhazhb@163.com; Zhibin_Zhangsd@126.com; Center for Sustainable Development and Global Competitiveness, Stanford University, Stanford, CA 94305, USA.
authors.forename: Zhibin
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China E-mail: zhazhb@163.com; Zhibin_Zhangsd@126.com.
authors.forename: Yanhao
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China E-mail: zhazhb@163.com; Zhibin_Zhangsd@126.com.
authors.forename: Xiaorui
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D000535:Aluminum / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry; D003029:Coagulants / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D009282:Naphthalenesulfonates / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000535:Aluminum; D001391:Azo Compounds; D002712:Chlorides; D003029:Coagulants; D004396:Coloring Agents; D005290:Ferric Compounds; D009282:Naphthalenesulfonates; D011108:Polymers; D062065:Wastewater; C472928:reactive bright red K2G; C024555:ferric chloride