Effect of the addition of organic carbon sources on nitrous oxide emission in anaerobic-aerobic (low dissolved oxygen) sequencing batch reactors

doi:10.1007/s11783-010-0248-4

Front Envir Sci Eng Chin

2010, Vol. 4

Issue (4) : 490-499 https://doi.org/10.1007/s11783-010-0248-4

RESEARCH ARTICLE

Effect of the addition of organic carbon sources on nitrous oxide emission in anaerobic-aerobic (low dissolved oxygen) sequencing batch reactors

Hongjing LI¹(

), Xiurong CHEN², Yinguang CHEN³

1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; 2. School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China; 3. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

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Abstract

The effect of additional organic carbon sources on the production of nitrous oxide (N₂O) in anaerobic-aerobic (low dissolved oxygen) real wastewater treatment system was investigated. In this paper, three laboratory-scale sequencing batch reactors (SBRs) (SBR-1, SBR-2 and SBR-3) were operating under an anaerobic-aerobic (low dissolved oxygen, 0.15–0.45 mg·L^-1) configuration. The SBRs were ‘long-term cultured’ respectively with a single municipal wastewater sample, sodium acetate, and a waste-activated sludge alkaline fermentation liquid as the additional carbon sources of real wastewater. Off-gas analysis showed that N₂O was emitted into the atmosphere during the aerobic (low dissolved oxygen) period in the three SBRs, and the order of N₂O emission rate was SBR-2>SBR-1>SBR-3. It was observed that the higher poly-β-hydroxyvalerate fraction of polyhydroxyalkanoates, the lower glycogen transformation and less nitrite accumulation was in SBR-3, while the opposite behavior was observed in SBR-2. Further research indicated that the interaction of the factors above potentially affected the N₂O emission in the anaerobic-aerobic (low dissolved oxygen) system.

Keywords anaerobic-aerobic (low dissolved oxygen) nitrous oxide (N₂O) emitting rate municipal wastewater waste activated sludge alkaline fermentation liquid

Corresponding Author(s): LI Hongjing,Email:lihongjing2371@163.com

Issue Date: 05 December 2010

Cite this article:

Yinguang CHEN,Hongjing LI,Xiurong CHEN. Effect of the addition of organic carbon sources on nitrous oxide emission in anaerobic-aerobic (low dissolved oxygen) sequencing batch reactors[J]. Front Envir Sci Eng Chin, 2010, 4(4): 490-499.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0248-4
https://academic.hep.com.cn/fese/EN/Y2010/V4/I4/490

Fig.1

Typical variations of glycogen during one cycle of all three SBRs

Fig.2

Typical variations of total PHA, PHB, PHV, and PH2MV during one cycle in three SBRs. (a) PHA; (b) PHB; (c) PHV; (d) PH2MV

Fig.3

Comparison of TP concentrations in three anaerobic-aerobic (low DO) systems

Fig.4

Typical variations of NH4+-N, NO3--N, NO2--N, and TN during one cycle in three SBRs. (a) NH4+-N; (b) NO3--N; (c) NO2--N; (d) TN

Fig.5

Comparison of emitting rate of N₂O in the aerobic (low DO) time among three SBRs

Tab.1

Main composition and their concentrations of real wastewater*

Tab.2

Variations of the main composition of alkaline fermentation liquid before and after phosphorus and nitrogen recovery

Tab.3

Main carbon source and BOD₅ concentrations in the influent of the three SBRs

Tab.4

Anaerobic and aerobic (low DO) transformations of PHA and glycogen in the three SBRs (n = 3)^*

Tab.5

Comparison of nitrogen and phosphorus removal in three SBRs (n = 3)*

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