CaO2促进MFC同步处理剩余污泥和六价铬废水的效能

Enhanced efficiency of the simultaneous treatment of sewage sludge and Cr（Ⅵ）-containing wastewater by CaO2 in microbial fuel cell

为了提高剩余污泥降解效能和废水中六价铬还原效能,研究了CaO2对微生物燃料电池同步处理剩余污泥和六价铬废水的影响,考察了不同CaO2投加量下微生物燃料电池阳极剩余污泥的降解效能、阴极六价铬的还原效能及产电效能.结果表明,当阳极室CaO2投加量分别为0,0.1,0.2,0.4,0.6,0.8gCaO2/gVSS时,运行120h后,阴极六价铬还原率分别为73.38%, 78.91%, 99.47%, 97.70%, 97.04%, 96.37%,运行30d后,阳极剩余污泥TCOD降解率分别为72.4%, 76.9%, 81.0%, 78.2%, 75.7%, 74.2%.证明投加CaO2后,六价铬还原率和TCOD降解率都有提高.当投加量为0.2gCaO2/gVSS时处理效能最好,输出电压最大为1.15V.六价铬还原率提高了36.08%,TCOD降解率提高了11.88%.此外,投加CaO2后微生物燃料电池电化学活性有所提高,表明CaO2投加对电池电子传递过程有促进作用.结果说明CaO2有利于提高对微生物燃料电池同步处理剩余污泥和六价铬废水效能.

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, 0.8 gCaO2/gVSS, respectively, the hexavalent chromium reduction efficiencies were 73.38%, 78.91%, 99.47%, 97.70%, 97.04%, 96.37% after operating for 120 h, 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 30 days, demonstrating the enhanced effectiveness through CaO2 dosage. The optimal dosage was 0.2 gCaO2/gVSS with voltage output of 1.15 V. 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.