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

被引:12
|
作者
Li, Cong [1 ]
Feng, Likui [2 ]
Lian, Jianjun [3 ]
Yu, Xiaoting [4 ]
Fan, Chunzhen [5 ]
Hu, Zhen [6 ]
Wu, Haiming [6 ]
机构
[1] Liaocheng Univ, Sch Geog & Environm, Liaocheng 252059, Peoples R China
[2] Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resources & Environm SKL, Harbin 150090, Peoples R China
[3] Anhui Univ Technol, Coll Energy & Environm, Maanshan 243002, Peoples R China
[4] Liaocheng City Ecol Environm Bur, Liaocheng 252000, Peoples R China
[5] Wenzhou Univ, Coll Life & Environm Sci, Natl & Local Joint Engn Res Ctr Ecol Treatment Tec, Key Lab Zhejiang Prov Water Environm & Marine Biol, Wenzhou 325000, Peoples R China
[6] Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource R, Qingdao 266237, Peoples R China
关键词
Static magnetic field; Constructed wetland; Nitrogen and phosphorus removal; Microbial community; WASTE-WATER TREATMENT; NITROGEN REMOVAL; DISSOLVED-OXYGEN; SUBSURFACE FLOW; DENITRIFICATION; COMMUNITIES; PERSPECTIVE; INTENSITY; EMISSION; STRATEGY;
D O I
10.1016/j.jenvman.2022.117192
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页数:9
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