Effect of influent COD/N ratio on performance and N2O emission of partial nitrification treating high-strength nitrogen wastewater
Effect of influent COD/N ratio on performance and N2O emission of partial nitrification treating high-strength nitrogen wastewater
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进水COD/N比对部分硝化处理高浓度含氮废水性能和N2O排放的影响
DOI：
10.1039/c5ra08364h
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发表时间：
2015-07
期刊：
影响因子：
3.9
通讯作者：
Wenkai Li.
中科院分区：
文献类型：
--
作者：
Zhen Hu;Huijun Xie;Dong Wei;Wenkai Li.
研究了部分硝化处理高浓度含氮废水时进水化学需氧量/氮（COD/N）比对脱氮和一氧化二氮（N2O）排放的影响。三个实验室规模的缺氧/好氧序批式反应器 (SBR) 在不同的进水 COD/N 比率（分别为 0.5、1.0 和 2.5）下运行。 COD/N 比为 0.5 和 1.0 时，亚硝酸盐积累率稳定且较高，约为 90%。当 COD/N 为 2.5（第 20-65 天）时，观察到暂时较高的亚硝酸盐积累率（89.9 ± 1.04%），然而，随后废水中的主要氮形态从亚硝酸盐变为硝酸盐。尽管部分硝化过程有很多好处，但大量产生 N2O（一种强效温室气体）仍然是这一创新且有前途的过程的一个问题。尝试通过增加缺氧/好氧相分数来最大限度地减少部分硝化过程中的N2O排放，结果发现，进水COD/N为0.5和1.0时，SBR中N2O排放量分别减少了50.6%和46.2%。这是因为较长的缺氧期有利于 nosZ 基因的表达，并导致异养微生物的丰度更高。
The effect of influent chemical oxygen demand/nitrogen (COD/N) ratio on nitrogen removal and nitrous oxide (N2O) emission during partial nitrification treating high-strength nitrogen wastewater was investigated. Three laboratory scale anoxic/aerobic sequencing batch reactors (SBRs) were operated under different influent COD/N ratios (0.5, 1.0, and 2.5, respectively). Stable and high nitrite accumulation ratios around 90% were obtained at COD/N ratios of 0.5 and 1.0. A temporary high nitrite accumulation ratio (89.9 ± 1.04%) was observed at a COD/N of 2.5 (days 20–65), however, the main nitrogen species in the effluents changed from nitrite to nitrate afterwards. Despite the many benefits of the partial nitrification process, the significant generation of N2O, a potent greenhouse gas, remains a problem for this innovative and promising process. Attempts to minimize N2O emissions during the partial nitrification process by increasing the anoxic/aerobic phase fraction were conducted, and it was found that the N2O emission quantity was reduced by 50.6% and 46.2% in SBR with influent COD/N of 0.5 and 1.0, respectively. This was because a longer anoxic phase benefited nosZ gene expression and resulted in higher abundance of heterotrophic microorganisms.
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