Variation of N2O emission and EPS production during simultaneous nitrification and denitrification in SBBR under different C/N ratio

被引：0

作者：

Gong Y. ^{[1
,2
]}

Zhao Q. ^{[1
]}

Peng Y. ^{[2
]}

机构：

[1] Department of Architecture Engineering, Yantai Vocational College, Yantai, 264670, Shandong

[2] National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing

来源：

Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 12期

关键词：

C/N ratio; Extracellular polymeric substance; N[!sub]2[!/sub]O; Simultaneous nitrification and denitrification;

D O I：

10.11949/0438-1157.20190753

中图分类号：

学科分类号：

摘要：

At normal temperature of (20±2.0)℃, the characteristics of N2O eimssion and extracellular polymeric substance(EPS) production were studied during simultaneous nitrification and denitrification(SND) process under different C/N ratio (C/N=3.0, 5.0, 8.0 and 10.0). When C/N increased from 3.0 to 10.0, the heterotrophic bacteria increased rapidly, DO decreased and the nitrification process was inhibited. The effluent NH4+ increased from below 0.5 mg/L to (7.85±1.42) mg/L, and the N2O emission decreased from (2.68±0.17) mg/L to (1.02±0.12) mg/L. When C/N was 8.0, the maximum total notrogen removal efficiency was 80.4%±3.5%. The accumulation of PHA(poly-β-hydroxyalkanoate) increased firstly and then decreased. Both nitrifier denitrification and heterotrophic denitrification resulted in N2O production. The anoxic area located in the biofilm decreased with the decreasing of C/N ratio, which weakened the denitrification process. With the increase of C/N ratio, N2O diffused into the anoxic region of biofilm can be effectively reduced. The microbial EPS secretion decreased from (57.6±5.6) mg / g VSS to (32.7±3.2) mg / g VSS. The TB-EPS content accounts for 65.8%-68.8% of the total EPS. Under low C/N, the content of polysaccharide (PS) in compact EPS (TB-EPS) increased, the biofilm was more compact, the resistance of N2O diffusion into the anoxic zone increased, and the release increased. © All Right Reserved.

引用

页码：4847 / 4855

页数：8

共 36 条

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