School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China; Department of Environmental Systems Science, Swiss Federal Institute of Technology (ETH) Zurich, 8092 Zurich, Switzerland.
Bioresour Technol. 2019 Jan;271:298-305. doi: 10.1016/j.biortech.2018.09.123. Epub 2018 Sep 26.
Simultaneous nitrification, anammox and denitrification (SNAD) process was developed in subsurface flow constructed wetlands (SFCWs) to treat polluted surface water. The effects of vegetation, hydraulic retention time (HRT), C/N, and influent nitrogen forms on nitrogen removal and microbial communities were investigated. Results showed that denitrification- and anammox-dominant SNAD corresponded to nitrate- and ammonia-dominant influent, respectively, and both could achieve more efficient nitrogen removal in planted SFCWs than the unplated. These higher efficiencies were due to the microbial growth, organic carbon release, oxygen supply and plant uptake promoted by vegetation. The electron donors accelerated denitrification but inhibited ammonia oxidation with deficient oxygen. Anammox contributed to nitrogen removal of 27.34% under oxygen-limited conditions without vegetation. Anammox combined with denitrification and plant uptake were over 90% in planted SFCWs. For the investigated factors, the ammonia, nitrate and C/N were the most significant ones influencing the microbial communities, further nitrogen removal pathways and performances.
同步硝化反硝化-厌氧氨氧化（SNAD）工艺被开发用于处理受污染的地表水的地下流人工湿地（SFCWs）中。研究了植被、水力停留时间（HRT）、C/N 和进水氮形态对氮去除和微生物群落的影响。结果表明，反硝化-厌氧氨氧化主导的 SNAD 分别对应于硝酸盐和氨主导的进水，与未种植的相比，种植的 SFCWs 中都能实现更高效的氮去除。这些更高的效率是由于植被促进了微生物的生长、有机碳的释放、氧气的供应和植物的吸收。电子供体加速了反硝化作用，但在缺氧条件下抑制了氨氧化。在没有植被的缺氧条件下，厌氧氨氧化对氮的去除贡献了 27.34%。在种植的 SFCWs 中，厌氧氨氧化与反硝化和植物吸收相结合，氮去除率超过 90%。在所研究的因素中，氨、硝酸盐和 C/N 是影响微生物群落、进一步氮去除途径和性能的最重要因素。
