Effect of substrate types on contaminant removals, electrochemical characteristics and microbial community in vertical flow constructed wetlands for treatment of urban sewage

被引：18
作者：
Bai, Shaoyuan [1 ,2 ]
Qin, Lanqian [1 ]
Liu, Liheng [1 ,2 ]
Gao, Xutao [1 ]
Ding, Yanli [3 ]
Li, Yanhong [2 ]
机构：
[1] Guilin Univ Technol, Coll Environm Sci & Engn, Guilin 541004, Peoples R China
[2] Guilin Univ Technol, Guangxi Key Lab Environm Pollut Control Theory &, Guilin 541004, Peoples R China
[3] Guilin Univ Technol, Coll Earth Sci, Guilin 541004, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2021年 / 280卷
基金：
中国国家自然科学基金;
关键词：
Vertical flow constructed wetlands; Quartz sand and coke; Contaminant removals; Electrochemical characteristics; Microbial community; High-concentration sewage;
D O I：
10.1016/j.jenvman.2020.111682
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The purpose of this study was to investigate the influence of substrates (quartz sand and coke) on the removal of pollutants (COD, NH4+-N and TP), electrochemical characteristics and microbial communities of vertical flow constructed wetlands (VFCW) under high pollutant loads. During operation, the removal rates of COD, NH4+-N and TP by VFCW-C (coke as substrate) were higher than that of VFCW-Q (quartz sand as substrate) by 9.73-19.41%, 5.03%-13.15% and 8.83%-14.58%, respectively. And the resistances of the VFCW-Q and VFCW-C were increased by 1228.9 Omega and 38.3 Omega, while their potentials were dropped from 182.4 mV to 377.9 mV-85.6 mV and 222.0 mV, respectively. The dominant bacteria at the bottoms of VFCW-Q and VFCW-C were individually aerobic denitrifying bacteria (ADNB; 14.98%)/ammonia oxidizing bacteria (AOB; 5.73%) and organics aerobic degrading bacteria (OADB; 12.48%)/ammonia oxidizing bacteria (AOB; 7.24%), while the predominant bacteria at their tops were separately ADNB (11.36%)/OADB (10.52%)/AOB (4.69%) and ADNB (15.09%)/AOB (8.86%) and OADB (3.20%) The removal of pollutants by VFCW-Q and VFCW-C may be mainly attributed to substrate adsorption and microbial degradation.
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页数：7
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