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

Environment International
Xinyi WangHuiyang Wen

Abstract

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 enha...Continue Reading

Citations

Sep 9, 2020·Environmental Science and Pollution Research International·Huiyang WenXinyi Wang
Jan 13, 2021·Journal of Environmental Management·Juan DuShuqing An
Jan 27, 2021·Bioresource Technology·Hongliang GuoDuu-Jong Lee
Jun 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Hoang Thi Hong AnhAndrew S Ball
Jun 30, 2021·Environmental Science and Pollution Research International·Shenyan ZhouShuqing An
Aug 29, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Deepak MaratheKanchan Kumari

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