Composition of extracellular polymeric substances in a partial nitrification reactor treating high ammonia wastewater and nitrous oxide emission.
Composition of extracellular polymeric substances in a partial nitrification reactor treating high ammonia wastewater and nitrous oxide emission.
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DOI：
10.1016/j.biortech.2015.02.104
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发表时间：
2015-08
影响因子：
11.4
通讯作者：
Dong Wei;B. Du;Jian Zhang;Zhen Hu;S. Liang;Yiran Li
中科院分区：
文献类型：
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作者：
Dong Wei;B. Du;Jian Zhang;Zhen Hu;S. Liang;Yiran Li
本研究的目的是表征的胞外聚合物（EPS）的组成过程中实现的部分硝化和随后的一氧化二氮（N2 O）排放处理高氨氮废水。运行120 d后，反应器达到了较高的氨氮去除率和稳定的亚硝酸盐积累。反应器中污泥絮体的平均粒径由102.6 μ m增加到258.5 μm。EPS的主要成分蛋白质（PN）和多糖（PS）分别增加到65.46 ± 3.27和21.63 ± 1.08 mg/g VSS。三维激发-发射矩阵光谱的结果表明，EPS转移到色氨酸PN类和腐殖酸类底物。在稳定运行过程中，N2 O排放量占总脱氮量的11.67%。研究结果有助于从EPS组成的变化更好地理解短程硝化的实现，并为考虑N2 O排放量确定脱氮效果提供更多信息。
The objective of this study was to characterize the composition of extracellular polymeric substances (EPS) during the achievement of partial nitrification and subsequent nitrous oxide (N2O) emission treating high ammonia wastewater. After operation of 120 days, the reactor achieved high ammonia removal efficiency and stable nitrite accumulation. The average size of sludge flocs in the reactor increased from 102.6 to 258.5 μm. The main compositions of EPS, including protein (PN) and polysaccharide (PS), increased to 65.46 ± 3.27 and 21.63 ± 1.08 mg/g VSS, respectively. Results of three-dimensional excitation-emission matrix spectroscopy implied that EPS transferred to tryptophan PN-like and humic acid-like substrates. N2O emission accounts for 11.67% of removed nitrogen during the steady state of partial nitrification reactor. The obtained results could contribute a better understanding the achievement of partial nitrification through the composition changes of EPS, and provide more information to determine nitrogen removal by considering N2O emission.