Combination of magnetic field and ultraviolet for fouling control in saline wastewater distribution systems

Zeyuan Liu; Yang Xiao; Tahir Muhammad; Yunpeng Zhou; Peng Hou; Yingdong Zha; Ruihong Yu; Shen Qu; Changjian Ma; Yunkai Li

doi:10.1016/j.watres.2024.121118

Combination of magnetic field and ultraviolet for fouling control in saline wastewater distribution systems

Water Res. 2024 Mar 1:251:121118. doi: 10.1016/j.watres.2024.121118. Epub 2024 Jan 8.

Authors

Zeyuan Liu¹, Yang Xiao², Tahir Muhammad³, Yunpeng Zhou², Peng Hou², Yingdong Zha², Ruihong Yu⁴, Shen Qu⁴, Changjian Ma⁵, Yunkai Li⁶

Affiliations

¹ College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; Engineering Research Center for Agricultural Water-Saving and Water Resources, Ministry of Education, Beijing 100083, China; Inner Mongolia Key Laboratory of River and Lake Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010070, China; Key Laboratory of Mongolian Plateau Ecology and Resource Utilization, Ministry of Education, Hohhot 010070, China.
² College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; Engineering Research Center for Agricultural Water-Saving and Water Resources, Ministry of Education, Beijing 100083, China.
³ College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China.
⁴ Inner Mongolia Key Laboratory of River and Lake Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010070, China; Key Laboratory of Mongolian Plateau Ecology and Resource Utilization, Ministry of Education, Hohhot 010070, China.
⁵ State Key Laboratory of Nutrient Use and Management, National Agricultural Experimental Station for Soil Quality (Jinan), Institute of Agricultural Resources and Environment, Shandong Academy of Agricultural Sciences, Jinan, China.
⁶ College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China; Engineering Research Center for Agricultural Water-Saving and Water Resources, Ministry of Education, Beijing 100083, China. Electronic address: yunkai@cau.edu.cn.

PMID: 38219689
DOI: 10.1016/j.watres.2024.121118

Abstract

Fouling is a significant challenge for recycling and reusing saline wastewaters for industrial, agricultural or municipal applications. In this study, we propose a novel approach of magnetic field (MaF) and ultraviolet (UV) combined application for fouling mitigation. Results showed, combination of MaF and UV (MaF-UV) significantly decreased the content of biofouling and reduced the complexity of microbial networks, compared to UV and MaF alone treatments. This was due to MaF as pretreatment effectively reduced the water turbidity, improve the influent water quality of UV disinfection and increases UV transmittance, eliminating the adverse impacts of UV scattering and shielding, hence increased the inactivation effectiveness of UV disinfection process. MaF assisted UV also reduced the abundance of UV-resistant bacteria and inhibited the risk of bacterial photoreactivation and dark repair. Meanwhile, MaF-UV drastically reduced the contents of precipitates and particulate fouling by accelerating the transformation rate of CaCO₃ crystal from compact calcite to loosen hydrated amorphous CaCO₃, and enhancing the flocculation process. These findings demonstrated that MaF-UV is an effective anti-fouling strategy, and provide insights for sustainable application of saline wastewaters.

Keywords: Biofouling; Magnetic field; Particulates; Precipitates; Saline wastewater; Ultraviolet.

MeSH terms

Agriculture
Bacteria
Disinfection / methods
Ultraviolet Rays
Wastewater*
Water Purification* / methods

Substances

Wastewater