中国科技论文在线Sulfatereductionusinganautotrophicbiocathode.PDF

中国科技论文在线 Sulfate reduction using an autotrophic biocathode under different initial pH values # ** 5 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) Abstract: In this paper, the aim is to investigate the effect of initial pH of wastewater on the 10 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 -1 -1 -1 -1 mg L •d was achieved with initial pH 6.0. The sulfate reductive rate reached 31 ± 0.85 mg L •d with initial pH 3.0, indicating that the autotrophic biocathode MEC could be used to remove sulfate 15 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. Desulfovi