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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2016, 37 (5)                                     Back

nstantaneous and historical temperature effects on a-pinene

Effect of COD/SO42- ratio and alkalinity on COD removal and sulfate reduction in two-phase expanded granular sludge bed


Jun Li1*, Tao Xiang1, Jie Wei1, Dongning Chen2 and Muhammad Aqeel Ashraf3

1School of Municipal and Environmental Engineering, Shenyang JianZhu University, Shenyang 110168, Peoples Republic of China.

2Shenyang Urban Planning Design and Research Institute, Shenyang 110168, Peoples Republic of China.

3Faculty of Science and Natural Resources, University Malaysia Sabah 88400 Kota Kinabalu, Sabah, Malaysia

*Corresponding Author E-mail:


 Publication Data

Paper received:

21 February 2016


Revised received:

27 April 2016


Re-revised received:

5 May 2016



23 June 2016



In the present study, a bench-scale two-phase expanded granular sludge bed (EGSB) reactor was applied for treatment of high-sulfate wastewater. The reactor was operated continuously at 35?C. The EGSB1, as sulfate-reducing phase, and EGSB2, as methane-producing phase, were combined after successful start-up. The treatment characteristics, including the effect of influent COD/ SO42- ratio and alkalinity in reactor have been discussed for EGSB1 and EGSB2 respectively. When total COD removal was 85%, the influent COD/SO42- ratio was 2.8.? When the ratio was less than 2.8, the COD removal descended quickly. The total sulfate removal then raised to 90% and the ratio exceeded 4.4. When influent alkalinity was kept at 8-10 mmol l-1, the total COD and SO42- removal reached 93.3% and 94.0% respectively. The results presented in the study provide some useful information for optimization of COD removal and SO42- reduction process in wastewater treatment.   



 Key words

Alkalinity, COD/SO42-, Granule sludge, High-sulfate wastewater, Two-phase anaerobic digestion process



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