| 剩余污泥为底物的微生物燃料电池处理含铜废水 |
| 摘要点击 2231 全文点击 2689 投稿时间：2010-02-04 修订日期：2010-05-04 |
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| 中文关键词 微生物燃料电池 剩余污泥 含铜废水 铜回收 |
| 英文关键词 microbial fuel cell(MFC) excess sludge Cu2+-containing wastewater copper recoveryc |
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| 中文摘要 |
| 以剩余污泥作为阳极底物，CuSO4溶液为阴极溶液构建了双室有膜微生物燃料电池（microbial fuel cell，MFC），研究了MFC的启动，污泥的降解，Cu2+的去除和阴极还原产物的性质.结果表明，Cu2+可作MFC的阴极电子受体，在外电路电阻为1000 Ω，Cu2+浓度为6400 mg/L的条件下获得的稳定输出电压为0.478 V，最大输出功率为536 mW/m3.应用MFC阴极可以实现水中Cu2+的去除，在外电路电阻为0 Ω，Cu2+浓度为1000 mg/L的条件下，288 h对Cu2+的去除率达到97.8%.阴极还原产物与阴极还原力强弱相关，阴极还原力较弱时，大部分Cu2+被还原为Cu2O，小部分Cu2+以Cu4(OH)6SO4的形式析出.阴极还原力较强时，大部分Cu2+被直接还原为单质铜，极小部分Cu2+被还原为Cu2O.剩余污泥为阳极底物能够使MFC保持长时间稳定运行，阳极污泥中产电微生物的富集时间影响MFC的产电性能与阴极Cu2+的还原，可通过监测阳极电势来判断阳极板上是否形成稳定的产电微生物膜.剩余污泥为底物的MFC可以实现在降解污泥中有机质同时处理含铜废水和回收单质铜. |
| 英文摘要 |
| The two-chamber microbial fuel cells (MFCs) were constructed with excess sludge as the anodic substrate and CuSO4 solution as the catholyte. The start up method, degradation of the anodic sludge, removal of the Cu2+ and products on cathode were investigated in the study. The results of batch experiments showed that Cu2+ can be used as cathodic electron acceptors, e.g. a stable voltage output of 0.478 V and a maximum power density of 536 mW/m3 were obtained at external resistance of 1000 Ω and Cu2+ concentration of 6400 mg/L. The Cu2+ contained in wastewater could be removed effectively by the MFC process, e.g. 97.8% of Cu2+ was removed in a MFC reactor at the end of 288 h with initial Cu2+ concentration of 1000 mg/L and external resistance of 0 Ω. The cathodic products depended on cathodic reducibility, most of Cu2+ was deposited as Cu2O and a small part as Cu4(OH)6SO4 with lower cathodic reducibility, metal copper deposited on the cathode with higher cathodic reducibility. Using excess sludge as anodic substrate could support the MFCs for long-term operation. The acclimation stage of the exoelectrogenic bacteria on the anode had an impact on MFC performance and cathodic reduction of Cu2+, and the stability of exoelectrogenic biofilm on anode could be determined by monitoring the anode potential. The MFC with excess sludge as anodic substrate can degrade organic matter in sludge and accomplish Cu2+-containing wastewater treatment and copper recovery simultaneously. |
