Research on polyhydroxyalkanoates and glycogen transformations: Key aspects to biologic nitrogen and phosphorus removal in low dissolved oxygen systems

doi:10.1007/s11783-010-0243-9

Front Envir Sci Eng Chin

2011, Vol. 5

Issue (2) : 283-290 https://doi.org/10.1007/s11783-010-0243-9

RESEARCH ARTICLE

Research on polyhydroxyalkanoates and glycogen transformations: Key aspects to biologic nitrogen and phosphorus removal in low dissolved oxygen systems

Hongjing LI¹(

), Yinguang CHEN²

1. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; 2. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

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Abstract

In this paper, a study was conducted on the effect of polyhydroxyalkanoates (PHA) and glycogen transformations on biologic nitrogen and phosphorus removal in low dissolved oxygen (DO) systems. Two laboratory-scale sequencing batch reactors (SBR1 and SBR2) were operating with anaerobic/aerobic (low DO, 0.15–0.45 mg·L^-1) configurations, which cultured a propionic to acetic acid ratio (molar carbon ratio) of 1.0 and 2.0, respectively. Fewer poly-3-hydroxybutyrate (PHB), total PHA, and glycogen transformations were observed with the increase of propionic/acetic acid, along with more poly-3-hydroxyvalerate (PHV) and poly-3-hydroxy-2-methyvalerate (PH2MV) shifts. The total nitrogen (TN) removal efficiency was 68% and 82% in SBR1 and SBR2, respectively. In the two SBRs, the soluble ortho-phosphate (SOP) removal efficiency was 94% and 99%, and the average sludge polyphosphate (poly-P) content (g·g-MLVSS^-1) was 8.3% and 10.2%, respectively. Thus, the propionic to acetic acid ratio of the influent greatly influenced the PHA form and quantity, glycogen transformation, and poly-P contained in activated sludge and further determined TN and SOP removal efficiency. Moreover, significant correlations between the SOP removal rate and the (PHV+ PH2MV)/PHA ratio were observed (R²>0.99). Accordingly, PHA and glycogen transformations should be taken into account as key components for optimizing anaerobic/aerobic (low DO) biologic nitrogen and phosphorus removal systems.

Keywords low dissolved oxygen (DO) biological nitrogen and phosphorus removal polyhydroxyalkanoates (PHA) glycogen

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

Issue Date: 05 June 2011

Cite this article:

Hongjing LI,Yinguang CHEN. Research on polyhydroxyalkanoates and glycogen transformations: Key aspects to biologic nitrogen and phosphorus removal in low dissolved oxygen systems[J]. Front Envir Sci Eng Chin, 2011, 5(2): 283-290.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0243-9
https://academic.hep.com.cn/fese/EN/Y2011/V5/I2/283

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