Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, PR China; Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China; Research Center for Pollution Control and Ecological Restoration, Yuxi Normal University, Yuxi 653100, Yunnan, PR China.
Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China; Centre for Technology in Water and Wastewater, University of Technology Sydney, Ultimo, NSW 2007, Australia.
Bioresour Technol. 2021 Jun;329:124897. doi: 10.1016/j.biortech.2021.124897. Epub 2021 Feb 26.
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 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. High-throughput 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.
本研究提出了一种新型间歇曝气人工湿地（CW）以解决三级处理中垂直耗氧问题。与非曝气 CW 相比，在溶解氧为 3mg/L 和水力停留时间为 2 天的条件下，间歇曝气 CW 表现出更好的去除性能（化学需氧量去除率为 90.8%，氨氮去除率为 94.3%，总氮去除率为 91.5%，总磷去除率为 94.1%）。这主要归因于氧气供应提高了细菌群落的丰度和多样性。高通量测序表明，间歇曝气 CW 中丰度较高的菌门 Proteobacteria（35.34%）和 Bacteroidetes（18.20%）负责同步去除氮和磷。此外，还检测到优势科 Burkholderiaceae（11.16%）、Microtrichales（6.88%）和 Saprospiraceae（6.50%），这对于水解和利用复杂有机物至关重要。总的来说，氧气供应上调了氨基酸和碳水化合物的代谢途径，为去除污染物带来了更大的生物降解潜力。
