title: Compound bioflocculant and polyaluminum chloride in kaolin-humic acid coagulation: factors influencing coagulation performance and floc characteristics.
abstract: The objective of this study was to investigate the influence of coagulant dosage and pH on coagulation performance and floc properties using polyaluminum chloride (PAC) and compound bioflocculant (CBF) dual-coagulant in kaolin-humic acid (HA) treatment. Results showed that as PAC dosage rose, comparatively better coagulation efficiencies and floc characteristics were achieved due to stronger charge neutralization and sweeping effect. Addition of CBF could enhance coagulation performance and floc properties, including size, strength and recoverability, except fractal dimension. Solution pH had a significant effect on coagulation efficiencies and flocs formation. Under acidic condition, flocs showed higher strength and recoverability but lower fractal dimension, where charge neutralization was the foremost mechanism. More compact flocs were generated under alkaline condition due to the sweeping effect of hydrolyzed Al species.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China.
authors.forename: Ruihua
authors.initials: R
authors.lastname: Li
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of 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, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China.
authors.forename: Xin
authors.initials: X
authors.lastname: Huang
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China.
authors.forename: Hongyu
authors.initials: H
authors.lastname: Dong
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China.
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Li
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of 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, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
mesh_terms: D000536:Aluminum Hydroxide / Q000737:chemistry*; D005427:Flocculation; D017709:Fractals; D006812:Humic Substances / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007616:Kaolin / Q000737:chemistry*; D010316:Particle Size
chemical_list: D006812:Humic Substances; C016213:aluminum oxychloride; D007616:Kaolin; D000536:Aluminum Hydroxide
keywords: Coagulation performance; Compound bioflocculant; Fractal dimension; pH