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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: junlee@sjzu.edu.cn
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Publication
Data
Paper received:
21 February 2016
Revised received:
27 April 2016
Re-revised received:
5 May 2016
Accepted:
23 June 2016
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Abstract
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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