title: Effects of papermaking sludge-based polymer on coagulation behavior in the disperse and reactive dyes wastewater treatment.
abstract: In this study, papermaking sludge was used as the raw biomass material to produce the lignin-based flocculant (LBF) by grafting quaternary ammonium groups and acrylamide. LBF was used as a coagulant aid with polyaluminum chloride (PAC) to treat reactive and disperse dyes wastewater. Effects of dosing method, pH, hardness and stirring speed on the coagulation behavior and floc properties were studied. Results showed that the superior coagulation efficiency and recovery factor were achieved by PAC+LBF compared with PAC and LBF+PAC. The primary mechanisms of LBF in the treatment of disperse and reactive dye solutions were charge neutralization and bridging effect, respectively. In the dual-coagulation, the impact of pH on the coagulation efficiency was weak during pH range of 5-9. Moderate hardness could enhance the floc properties due to the decrease of electrostatic repulsion and the chelation of Ca(II) and LBF. Besides, flocs coagulated by PAC+LBF had a stronger anti-crush ability.
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, Shandong 250100, 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, Shandong 250100, 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, Shandong 250100, People's Republic of China.
authors.forename: Kangying
authors.initials: K
authors.lastname: Guo
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, Shandong 250100, People's Republic of China.
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
authors.affiliation: School of Urban Construction and Environmental Engineering, Chongqing University, No. 83 Shapingba Beijie, Chongqing 400045, People's Republic of China.
authors.forename: Huaili
authors.initials: H
authors.lastname: Zheng
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, Shandong 250100, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
mesh_terms: D004396:Coloring Agents; D005427:Flocculation; D011108:Polymers; D012722:Sewage; D062065:Wastewater; D018508:Water Purification
chemical_list: D004396:Coloring Agents; D011108:Polymers; D012722:Sewage; D062065:Wastewater
keywords: Dual-coagulant; Floc structure; Flocculation index; Papermaking sludge; Recovery factor