Bioaugmented constructed wetlands for denitrification of saline wastewater: A boost for both microorganisms and plants

被引：68
作者：
Wang, Xinyi [1 ,2 ]
Zhu, Hui [1 ,2 ]
Yan, Baixing [1 ,2 ]
Shutes, Brian [3 ]
Banuelos, Gary [4 ]
Wen, Huiyang [1 ,2 ]
机构：
[1] Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun 130102, Peoples R China
[2] Jilin Prov Engn Ctr CWs Design Cold Reg & Beautif, Changchun 130102, Peoples R China
[3] Middlesex Univ, Dept Nat Sci, London NW4 4BT, England
[4] ARS, USDA, San Joaquin Valley Agr Sci Ctr, 9611 South Riverbend Ave, Parlier, CA 93648 USA
来源：
ENVIRONMENT INTERNATIONAL | 2020年 / 138卷
关键词：
Saline wastewater; Constructed wetlands; Microbial augmentation; Alishewanella sp; Denitrifying bacteria; MICROBIAL COMMUNITY; NITROGEN REMOVAL; SALT-TOLERANCE; PERFORMANCE; AQUACULTURE; EFFICIENCY; REACTOR; GROWTH; BIODEGRADATION; NITRIFICATION;
D O I：
10.1016/j.envint.2020.105628
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The inhibition of salt stress on plant and microbial functions has led to the reduction of nitrogen removal capacity of constructed wetlands (CWs) under saline conditions. The mechanisms and effectiveness of bioaugmented CW (Bio-CW) microcosms with a salt-tolerant microbial inoculum were evaluated for nitrogen removal at different salinity levels. The results showed that the denitrification capacity of CWs was improved under saline conditions by adding the salt-tolerant microbial inoculum. At an EC of 15 mS/cm, the removal percentages of ammonia nitrogen (NH4+-N) and total nitrogen (TN) in Bio-CW microcosms (95.7% and 99.4%) on Day 5 were significantly (p < 0.05) higher than that in unbioaugmented CW (un-Bio-CW) microcosms (68.5% and 76.4%), respectively. The high throughput sequencing data of substrate samples indicated that the microbial community in the CWs was changed by the addition of the salt-tolerant microbial inoculum and the frequency of bacteria with nitrogen removal function was increased in the CWs. Furthermore, both growth and the TN accumulation capacity of plants in Bio-CW microcosms were promoted compared with the un-Bio-CW microcosms. In conclusion, the addition of the salt-tolerant microbial inoculum can enhance the nitrogen removal efficiency of CWs under saline condition via boosting the function of both microorganisms and plants.
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页数：10
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