title: The dye or humic acid water treatment and membrane fouling by polyaluminum chloride composited with sodium alginate in coagulation-ultrafiltration process.
abstract: Composite flocculants have been extensively studied and applied in recent years in order to improve the water treatment efficiency. In this study, a new composite flocculant prepared by polyaluminum chloride (PAC) and sodium alginate (SA) was used to treat dye and humic acid water in the coagulation-ultrafiltration process. The subsequent effects of PAC/SA on ultrafiltration membrane fouling were investigated by calculating the Modified Fouling Index (MFI). The results showed that the application of PAC/SA could not only restrict the membrane fouling but also improve the removal efficiency of the coagulation-ultrafiltration process. MFI of PAC/SA was the lowest, followed by PAC and the raw water for coagulated effluents filtered by ultrafiltration membrane. For example, MFI of PAC/SA was 0.40 s mL(-2) for reactive blue KGL (denoted as RB-KGL) treatment, while that of PAC was 2.26 s mL(-2). The removal efficiencies were improved as coagulation was used as pretreatment of ultrafiltration membrane. And PAC/SA could form the higher removal efficiency than PAC, especially for RB-KGL. The color removal efficiency of PAC/SA was 96.36% for RB-KGL treated by coagulation-ultrafiltration process, which was higher than that of PAC (85.62%).
authors.affiliation: School of Environmental Science and Engineering, Shandong University, Jinan, China. wangyan_sdjn@yahoo.com.cn
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Zhang
authors.forename: Yongbao
authors.initials: Y
authors.lastname: Chu
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
mesh_terms: D000464:Alginates / Q000737:chemistry*; D000536:Aluminum Hydroxide / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D005427:Flocculation; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006812:Humic Substances; D008567:Membranes, Artificial; D014462:Ultrafiltration / Q000379:methods*; D018508:Water Purification / Q000379:methods*
chemical_list: D000464:Alginates; D004396:Coloring Agents; D006603:Hexuronic Acids; D006812:Humic Substances; D008567:Membranes, Artificial; C016213:aluminum oxychloride; D000536:Aluminum Hydroxide; D020723:Glucuronic Acid