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| Enhanced efficiency of the simultaneous treatment of sewage sludge and Cr(VI)-containing wastewater by CaO2 in microbial fuel cell |
| DONG Quan-sheng1, ZHAO Qing-liang1,2, YU Hang1,3, LIANG Zhu-yuan1, WANG Shu-tian1, WANG Kun1,2 |
1. School of Environment, Harbin Institute of Technology, Harbin 150090, China;
2. State Key Lab of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;
3. Institute of Environmental Pollution Control, Dalian Maritime University, Dalian 116026, China |
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Abstract To increase the efficiencies of sewage sludge degradation and hexavalent chromium reduction, the effect of CaO2 dosage on simultaneous treatment of sewage sludge and hexavalent chromium wastewater in microbial fuel cell (MFC) was studied. Specifically, the effect of different CaO2 dosage on the degradation of sewage sludge in the anodic chamber, reduction of hexavalent chromium in the cathodic chamber, and promotion of electricity generation in the MFC were also investigated. Results showed that when the CaO2 dosage were 0, 0.1, 0.2, 0.4, 0.6, 0.8gCaO2/gVSS, respectively, the hexavalent chromium reduction efficiencies were 73.38%, 78.91%, 99.47%, 97.70%, 97.04%, 96.37% after operating for 120h, and TCOD degradation efficiencies of sludge in anodic chamber were 72.4%, 76.9%, 81.0%, 78.2%, 75.7% and 74.2% after operating for 30days, demonstrating the enhanced effectiveness through CaO2 dosage. The optimal dosage was 0.2gCaO2/gVSS with voltage output of 1.15V. The reduction efficiency of hexavalent chromium was increased by 36.08% and the degradation efficiency of TCOD by 11.88%. In addition, the electrochemical activity of the MFC increased after the addition of CaO2, indicating that it can also enhance the efficiencies of sewage sludge degradation and hexavalent chromium reduction as well as accelerate the electron transfer process of the MFC.
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Received: 15 November 2018
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