School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
School of Environmental Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, PR China.
Bioresour Technol. 2017 Jun;234:243-252. doi: 10.1016/j.biortech.2017.03.036. Epub 2017 Mar 9.
Three novel floating treatment wetlands, including autotrophic enhanced floating treatment wetland (AEFTW), heterotrophic enhanced floating treatment wetland (HEFTW) and enhanced floating treatment wetland (EFTW) were developed to remove nitrogen from the secondary effluent. Results showed that the analogously excellent nitrogen removal performance was achieved in AEFTW and HEFTW. About 89.4% of the total nitrogen (TN) was removed from AEFTW at a low S/N of 0.9 and 88.5% from HEFTW at a low C/N of 3.5 when the hydraulic retention time (HRT) was 1d in summer. Higher nitrification and denitrification performance were achieved in AEFTW. Addition of electron donors effectively reduced the NO emission, especially in summer and autumn. High-throughput sequencing analysis revealed that the electron donors distinctly induced the microbial shifts. Dechloromonas, Thiobacillus and Nitrospira became the most predominant genus in HEFTW, AEFTW and EFTW. And autotrophic and heterotrophic denitrification could simultaneously occur in HEFTW and AEFTW.
三种新型浮式处理湿地，包括自养强化浮式处理湿地（AEFTW）、异养强化浮式处理湿地（HEFTW）和强化浮式处理湿地（EFTW），被开发用于从二级出水去除氮。结果表明，AEFTW 和 HEFTW 具有类似的优异脱氮性能。在夏季水力停留时间（HRT）为 1d 时，当 S/N 为 0.9 时，AEFTW 去除了约 89.4%的总氮（TN），当 C/N 为 3.5 时，HEFTW 去除了 88.5%的总氮（TN）。AEFTW 具有更高的硝化和反硝化性能。添加电子供体可有效减少 NO 排放，尤其是在夏季和秋季。高通量测序分析表明，电子供体明显诱导了微生物的变化。在 HEFTW、AEFTW 和 EFTW 中，脱氯菌、硫杆菌和硝化螺菌成为最主要的属。并且异养和自养反硝化可以同时在 HEFTW 和 AEFTW 中发生。
