The effect of poly-β-hydroxyalkanoates degradation rate on nitrous oxide production in a denitrifying phosphorus removal system

被引：27

作者：

Wei, Yan ^{[1
]}

Wang, Shuying ^{[1
]}

Ma, Bin ^{[1
]}

Li, Xiyao ^{[1
]}

Yuan, Zhiguo ^{[1
,2
]}

He, Yuelan ^{[1
]}

Peng, Yongzhen ^{[1
]}

机构：

[1] Beijing Univ Technol, Engn Res Ctr Beijing, Key Lab Beijing Water Qual Sci & Water Environm R, Beijing 100124, Peoples R China

[2] Univ Queensland, Adv Water Management Ctr, St Lucia, Qld 4072, Australia

来源：

BIORESOURCE TECHNOLOGY | 2014年 / 170卷

关键词：

Nitrous oxide (N2O); Denitrifying phosphorus removal; Poly-beta-hydroxyalkanoates (PHAs); Nitrite; ACTIVATED-SLUDGE; WASTE-WATER; ACCUMULATING ORGANISMS; METABOLISM; REDUCTION; 2-SLUDGE; DENITRIFICATION; NITRIFICATION; EMISSION;

D O I：

10.1016/j.biortech.2014.06.012

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Poly-beta-hydroxyalkanoates (PHAs) and free nitrous acid (FNA) have been revealed as significant factors causing nitrous oxide (N2O) production in denitrifying phosphorus removal systems. In this study, the effect of PHA degradation rate on N2O production was studied at low FNA levels. N2O production always maintained at approximately 40% of the amount of nitrite reduced independent of the PHA degradation rate. The electrons distributed to nitrite reduction were 1.6 times that to N2O reduction. This indicated that electron competition between these two steps was not affected by the PHA degradation rate. Continuous feed of nitrate was proposed, and demonstrated to reduce N2O accumulation by 75%. While being kept low, a possible compounding effect of a low-level FNA could not be ruled out. The sludge used likely contained both polyphosphate- and glycogen-accumulating organisms, and the results could not be simply attributed to either group of organisms. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：175 / 182

页数：8

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