title: Influence of Enteromorpha polysaccharides on variation of coagulation behavior, flocs properties and membrane fouling in coagulation-ultrafiltration process.
abstract: Enteromorpha polysaccharides (Ep) were used as a new coagulant aid together with polyaluminum chloride (PACl) in coagulation-ultrafiltration process to purify Yellow River water. The evolution of flocs size, growth rate, strength, recoverability and fractal structure due to Ep addition were systematically studied in this paper. On this basis, membrane fouling caused by the coagulation effluents of PACl and Ep were also investigated. Results indicated that Ep addition lead to 20% increase in coagulation performance, and meanwhile generate flocs with bigger sizes, faster growth rates and higher recovery abilities. Additionally, the flocs formed by PACl presented more compact structure with a larger D(f) value, while much looser flocs were obtained when Ep was added. Results of ultrafiltration experiments implied that with Ep addition, membrane fouling could be significantly reduced due to large size and loosely structures of flocs in coagulation effluents. Considering both the coagulation efficiency and ultrafiltration membrane performance, 0.2 mg/L Ep was determined as the optimal dosage in coagulation-ultrafiltration process in this study.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China.
authors.forename: Shuang
authors.initials: S
authors.lastname: Zhao
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China. Electronic address: baoyugao_sdu@aliyun.com.
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China.
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China.
authors.forename: Shenglei
authors.initials: S
authors.lastname: Sun
authors.affiliation: Jinan Water and Wastewater Monitoring Center, 250033 Jinan, PR China.
authors.forename: Wuchang
authors.initials: W
authors.lastname: Song
authors.affiliation: Jinan Water and Wastewater Monitoring Center, 250033 Jinan, PR China.
authors.forename: Ruibao
authors.initials: R
authors.lastname: Jia
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D005427:Flocculation; D008567:Membranes, Artificial; D011134:Polysaccharides / Q000737:chemistry*; D014462:Ultrafiltration; D044445:Ulva; D018508:Water Purification / Q000379:methods*
chemical_list: D008567:Membranes, Artificial; D011134:Polysaccharides; C016213:aluminum oxychloride; D000536:Aluminum Hydroxide
keywords: Coagulation–ultrafiltration; Enteromorpha; Flocs characteristics; Membrane fouling; Polysaccharides