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Sulfate reduction using an autotrophic biocathode under different initial pH values
TENG Wenkai,ZHANG Renduo,LIU Guangli,LUO Haiping *
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou, Guangdong, 510275, China
*Correspondence author
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Funding: Specialized Research Fund for the Doctoral Program of Higher Education （No.No.20130171120022）, National Natural Science Foundation of China （No.Nos. 51308557, 51278500, and 41471181）, National Natural Science Foundation of Guangdong （No.Nos. S2013010012984 and 2015A030313169）
Opened online:15 June 2016
Accepted by: none
Citation: TENG Wenkai,ZHANG Renduo,LIU Guangli.Sulfate reduction using an autotrophic biocathode under different initial pH values[OL]. [15 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4696179
 
 
In this paper, the aim is to investigate the effect of initial pH of wastewater on the autotrophic sulfate-reducing biocathode. Experiments were conducted using double-chamber microbial electrolysis cell (MEC) under fed-batch mode. Sulfate removal in the MEC increased from 2.4% to 56% with initial pH values from 2.0 to 6.0. The maximum sulfate reductive rate of 57 ± 4.6 mg L-1od-1 was achieved with initial pH 6.0. The sulfate reductive rate reached 31 ± 0.85 mg L-1od-1 with initial pH 3.0, indicating that the autotrophic biocathode MEC could be used to remove sulfate under an acidic condition. High-throughput sequencing analyses showed that Proteobacteria accounted for more than 50% of the bacterial community on the biocathode. As important sulfate-reducing bacteria (SRB) belonging to Proteobacteria, Desulfovibrio sp. occupied 46% to 66% of the cathode biofilm with initial pH values from 3.0 to 6.0. Desulfovibrio simplex was proved to be acid tolerant and grew dominantly on the biocathode when the initial pH was 3.0. The autotrophic biocathode MEC should be a valuable alternative to remove sulfate in wastewater.
Keywords:Biocathode, Microbial electrolysis cell, Sulfate reduction, Bacterial community
 
 
 

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