Synthesis, characterization and flocculation performance of a novel sodium alginate-based flocculant

Caiyu Liu; Baoyu Gao; Shue Wang; Kangying Guo; Xue Shen; Qinyan Yue; Xing Xu

doi:10.1016/j.carbpol.2020.116790

Synthesis, characterization and flocculation performance of a novel sodium alginate-based flocculant

Carbohydr Polym. 2020 Nov 15:248:116790. doi: 10.1016/j.carbpol.2020.116790. Epub 2020 Jul 21.

Authors

Caiyu Liu¹, Baoyu Gao², Shue Wang³, Kangying Guo⁴, Xue Shen⁵, Qinyan Yue⁶, Xing Xu⁷

Affiliations

¹ Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 26600, PR China. Electronic address: lcy199501@163.com.
² Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 26600, PR China. Electronic address: baoyugao_sdu@aliyun.com.
³ School of Public Health, Shandong University, Jinan 250012, PR China. Electronic address: wse@sdu.edu.cn.
⁴ Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 26600, PR China. Electronic address: 1302760555@qq.com.
⁵ Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 26600, PR China. Electronic address: xueshen_sdu@163.com.
⁶ Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 26600, PR China. Electronic address: qyyue@sdu.edu.cn.
⁷ Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 26600, PR China. Electronic address: 727649790@qq.com.

PMID: 32919530
DOI: 10.1016/j.carbpol.2020.116790

Abstract

In this study, a natural polymer-based organic flocculant (sodium alginate-methacrylatoethyl trimethyl ammonium chloride, SA-PDMC) was synthesized by graft copolymerization. The optimum preparation procedures were determined by single factor experiments. The flocculation behaviors of SA-PDMC were investigated in humic acid (HA) and kaolin suspension considering the effects of flocculant doses and initial pH. The results indicated that charge neutralization and bridging action played an important role in the removals of HA and kaolin. Also, SA-PDMC performed well in a wide pH range of 5.0-10.0. Besides, SA-PDMC, as polyaluminium (PAC) aid, was investigated in the lake water treatment. The ratio of PAC and SA-PDMC was optimized through response surface methodology based on a central composite design. Results showed that SA-PDMC and PAC have a strong synergy, under optimal conditions SA-PDMC can reduce the dose of PAC by 40 % while ensuring the water quality.

Keywords: Flocculation behavior; Optimization; Response surface analysis; Sodium alginate-based flocculant.