WU Qiong1,2，ZHANG Guoping1，FU Zhiping1,2，LIU Fengjuan1,2，CHEN Jingjing1,2， MA Chao1,2，OUYANG Xiaoxue1,2
(1． State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China)
Abstract: Sb-polluted wastewater was remediated by sulfate-reducing bacteria (SRB). SRB reduces SO42- to H2S. Then, Sb(V) in wastewater was reduced to Sb(III) by H2S. Finally, Sb(III) was reacted with excess H2S, resulting in precipitation of antimony sulfide. In this work, removal of Sb (initial concentration of 5 mg/L) from wastewater under a continuous flow condition by SRB was investigated. In the treatment, activated carbon was added into the wastewater to form a biological membrane and hydraulic retention time was 33 h. Physicochemical variables including pH, Eh, OD value and concentrations of SO42-, H2S, HCO3-, Sb(V) and Sb(III) were determined to evaluate the effect of the remediation. Results show that, under the continuous flow condition, Sb in the wastewater could be efficiently removed by SRB. After 10 days, Sb removal was up to 95.2%.
Keywords: sulfate-reducing bacteria; continuous flow; wastewater; antimony
EARTH AND ENVIRONMENT Vol.44, No.6 Tot No.314, 2016, Page 691-698
