Department of Environmental Resources Engineering, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, NY 13210, USA.
Water Environ Res. 2012 Dec;84(12):2099-105. doi: 10.2175/106143012x13415215907095.
Simultaneous nitritation/anammox and nitrification/denitrification (SNAND) is a promising method to increase nitrogen removal from ammonium- and nitrate-rich wastewater. This study examined the effects of influent nitrogen concentrations on plant assimilation and microbial nitrogen removal via SNAND in three free water surface wetlands. Anammox and denitrification contributed 78 and 22%, respectively, of microbial removal of total inorganic nitrogen (TIN). Nitrogen removal rates increased with influent concentrations in the low ranges of 17 to 105 mg N/L ammonium and 51 to 179 mg N/L TIN. However, nitrogen removal rates appeared to decrease with influent concentrations in the high ranges of 248 to 293 mg N/L ammonium and 348 to 391 mg N/L TIN. Plant growth was negatively affected when influent ammonium concentration exceeded 46 to 76 mg N/L. Plant assimilation contributed 11 to 47% toward TIN removal at low influent ammonium concentrations (42 to 76 mg N/L) and 4% at high influent ammonium concentrations (mean 264 mg N/L).
同步硝化反硝化/厌氧氨氧化（SNAND）是一种从富含铵和硝酸盐的废水中增加脱氮的有前途的方法。本研究在三个自由水面湿地中考察了进水氮浓度对通过 SNAND 进行植物同化和微生物脱氮的影响。厌氧氨氧化和反硝化分别贡献了总无机氮（TIN）中微生物去除的 78%和 22%。在 17 至 105 mg N/L 铵和 51 至 179 mg N/L TIN 的低进水浓度范围内，氮去除率随进水浓度的增加而增加。然而，氮去除率似乎随进水浓度在 248 至 293 mg N/L 铵和 348 至 391 mg N/L TIN 的高浓度范围内而降低。当进水氨浓度超过 46 至 76 mg N/L 时，植物生长受到负面影响。在低进水氨浓度（42 至 76 mg N/L）下，植物同化对 TIN 去除的贡献为 11%至 47%，而在高进水氨浓度（平均 264 mg N/L）下，贡献为 4%。
