Enhanced electrooxidation/electrocoagulation-ultrafiltration membrane process with S 2 O 4 2- for saline algae-containing surface water treatment: Purification and membrane performance.

Autor: Song W; School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China. Electronic address: sw_hitsz@foxmail.com., Li B; School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China. Electronic address: l15027047096@163.com., Zhuang Z; School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China. Electronic address: Z794911612@163.com., Du X; School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China. Electronic address: hitduxing@163.com., Lin D; School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China; State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China. Electronic address: dachiu_lam@foxmail.com., Zhou Y; Guangzhou Water Supply Co., Ltd., Guangzhou, 510000, PR China. Electronic address: 48160630@qq.com., Wang Z; School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China. Electronic address: wzhihong@gdut.edu.cn.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2024 Mar 15; Vol. 345, pp. 123423. Date of Electronic Publication: 2024 Feb 01.
DOI: 10.1016/j.envpol.2024.123423
Abstrakt: The surface water in coastal areas involving algae, is often affected by saline and emerging contaminants caused by saltwater intrusion, and expanding aquaculture industry. Therefore, it is necessary to conduct studies to address the issues that affect ecological safety and health of aquatic environments. This study presents the development of an enhanced electrooxidation/electrocoagulation-ultrafiltration (EO/EC-UF) membrane process using S 2 O 4 2- (DTN@EO/EC-UF) for the treatment of saline water containing algae. Our results have shown that significant removal of NH 3 -N (95.1 %), UV 254 (89.4 %) and algae (75.7 %) was achieved with the addition of S 2 O 4 2- (DTN). Additionally, an optimal DTN dosage of 40 mg/L was used in the DTN@EO/EC process to enhance water purification, utilizing reactive species such as SO 4 ·- and ·OH. After coupling with the ultrafiltration (UF) process, optimal operating conditions (DTN: 40 mg/L, current density: 4.65 mA/cm 2 , electrolysis: 60 s) were applied to treat the saline algae-containing surface water. The generated free chlorine, including NHCl 2 , accounted for approximately 22 % (0.14 mg/L). In addition, DTN significantly improved the ceramic membrane's permeability and anti-fouling characteristics, with a maximum increasing specific flux from 0.76 to 0.93, mainly attributing to the reduced the irreversible fouling resistance. Furthermore, we discovered that common membrane cleaning using acid or base enhanced the DTN@EO/EC-UF process. In conclusion, this study established an innovative DTN@EO/EC-UF process with excellent performance in terms of water purification and membrane self-cleaning. The results provided a promising alternative for treating saline algae-containing surface water.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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