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Evaluation of an intermittent-aeration constructed wetland for removing residual organics and nutrients from secondary effluent: Performance and microbial analysis
Li, Jia1,2,3; Zheng, Lei2,4; Ye, Changbing3; Ni, Baosen3; Wang, Xingzhu2; Liu, Hong2
2021-06-01
摘要This study proposed a novel intermittent-aeration constructed wetland (CW) to resolve the vertical loss of oxygen in tertiary treatment. Compared to the non-aeration CW, the intermittent-aeration CW presented a better removal performance (90.8% chemical oxygen demand, 94.3% ammonia nitrogen, 91.5% total nitrogen and 94.1% total phosphorus) at a dissolved oxygen of 3 mg L-1 and hydraulic retention time of 2 days. It was mainly attributed to the higher abundance and greater diversity of bacterial community due to the oxygen supply. Highthroughput sequencing indicated that high abundance of phyla Proteobacteria (35.34%) and Bacteroidetes (18.20%) in intermittent-aeration CW were responsible for simultaneous nitrogen and phosphorus removal. Besides, the dominant families Burkholderiaceae (11.16%), Microtrichales (6.88%) and Saprospiraceae (6.50%) were also detected, which was vital to hydrolyze and utilize complex organic matters. In general, oxygen supply upregulated the metabolism pathways of amino acid and carbohydrate, bringing a greater biodegradation potential for removing contaminants.
关键词Oxygen vertical loss Intermittent-aeration constructed wetland Nutrients removal Microbial community structure
DOI10.1016/j.biortech.2021.124897
发表期刊BIORESOURCE TECHNOLOGY
ISSN0960-8524
卷号329页码:10
通讯作者Liu, Hong(liuhong@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000634858900009
语种英语