Enhancement of organics and nutrient removal and microbial mechanism in vertical flow constructed wetland under a static magnetic field

Cong Li; Likui Feng; Jianjun Lian; Xiaoting Yu; Chunzhen Fan; Zhen Hu; Haiming Wu

doi:10.1016/j.jenvman.2022.117192

Enhancement of organics and nutrient removal and microbial mechanism in vertical flow constructed wetland under a static magnetic field

J Environ Manage. 2023 Mar 15:330:117192. doi: 10.1016/j.jenvman.2022.117192. Epub 2023 Jan 6.

Authors

Cong Li¹, Likui Feng², Jianjun Lian³, Xiaoting Yu⁴, Chunzhen Fan⁵, Zhen Hu⁶, Haiming Wu⁷

Affiliations

¹ School of Geography and Environment, Liaocheng University, Liaocheng 252059, PR China.
² State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), School of Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: 422816499@qq.com.
³ College of Energy and Environment, Anhui University of Technology, Maanshan 243002, PR China.
⁴ Liaocheng City Ecological Environment Bureau, Liaocheng 252000, PR China.
⁵ National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Key Laboratory of Zhejiang Province for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou 325000, PR China.
⁶ Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao 266237, PR China.
⁷ Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Qingdao 266237, PR China. Electronic address: haimingwu20@sdu.edu.cn.

PMID: 36621318
DOI: 10.1016/j.jenvman.2022.117192

Abstract

Low and unstable pollutant removal is regarded as the bottleneck problem in constructed wetlands (CWs) for wastewater treatment. This study investigated the effect of static magnetic field (MF) on enhancing the purification efficiency and microbial mechanism in vertical flow CW systems for treating domestic wastewater. The results showed that MF-CWs outperformed control systems in terms of treatment performance, with average removal efficiencies of COD, NH₄⁺-N, TN, and TP reaching 92.58%, 73.58%, 72.53%, and 95.83%, respectively. The change of malondialdehyde (MDA), catalase (CAT), and superoxide dismutase (SOD) activity indicated that MF application was beneficial for plant health. Additionally, higher ammonia monooxygenase (AMO) activity in MF-CWs suggested the removal of NH₄⁺-N was facilitated. The high-throughput sequencing results demonstrated that MF application could enrich the functional bacteria such as Patescibacteria phylum, mainly, including Gammaproteobacteria, Betaproteobacteria, and Alphaproteobacteria, which further accelerated pollutants transformation. These findings would be beneficial in understanding pollutant removal processes and their mechanism in CWs with MF application.

Keywords: Constructed wetland; Microbial community; Nitrogen and phosphorus removal; Static magnetic field.

MeSH terms

Environmental Pollutants*
Nitrogen / analysis
Nutrients
Waste Disposal, Fluid* / methods
Wetlands

Substances

Nitrogen
Environmental Pollutants