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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.1 P.133-141


Applicability of anoxic-oxic process in treating petrochemical wastewater

Author(s):  Li-jun ZHAO, Fang MA, Jing-bo GUO

Affiliation(s):  School of Chemical Engineering, China University of Petroleum, Beijing 102249, China; more

Corresponding email(s):   wwep001@yahoo.com.cn

Key Words:  Petrochemical wastewater, Polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE), Anoxic-oxic (A/O) process, Applicability

Li-jun ZHAO, Fang MA, Jing-bo GUO. Applicability of anoxic-oxic process in treating petrochemical wastewater[J]. Journal of Zhejiang University Science A, 2009, 10(1): 133-141.

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author="Li-jun ZHAO, Fang MA, Jing-bo GUO",
journal="Journal of Zhejiang University Science A",
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%T Applicability of anoxic-oxic process in treating petrochemical wastewater
%A Li-jun ZHAO
%A Fang MA
%A Jing-bo GUO
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%@ 1673-565X
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A0820006

T1 - Applicability of anoxic-oxic process in treating petrochemical wastewater
A1 - Li-jun ZHAO
A1 - Fang MA
A1 - Jing-bo GUO
J0 - Journal of Zhejiang University Science A
VL - 10
IS - 1
SP - 133
EP - 141
%@ 1673-565X
Y1 - 2009
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A0820006

To explore the applicability of anoxic-oxic (A/O) activated sludge process for petrochemical wastewater treatment, the relationship between bacterial community structure and pollutants loading/removal efficiencies was investigated by gas chromatograph-mass spectrometry (GC-MS), polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) and other conventional techniques. It showed that when the concentrations of the influent chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N) were 420~560 mg/L and 64~100 mg/L, respectively, the corresponding average effluent concentrations were 160 mg/L and 55 mg/L, which were 1.6 and 2.2 times higher than those of the national standards in China, respectively, demonstrating the inefficient performances of A/O process. Analysis of GC-MS indicated that refractory pollutants were mainly removed by sludge adsorption, but not by biodegradation. PCR-DGGE profile analysis suggested that the biological system was species-rich, but there was apparent succession of the bacterial community structure in different locations of the A/O system. Variations of bacterial community structure and pollutant loadings had obvious influences on pollutants removal efficiencies. Thus, A/O process was inapplicable for the treatment of complicated petrochemical wastewater, and strategies such as the reinforcement of pre-treatment and two-stage A/O process were suggested.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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