Electrical performance of MFC-MEC coupling system and treatment of heavy metal wastewater containing cadmium

Lulu PAN; Danjing WU; Weiping LIU

doi:10.11949/j.issn.0438-1157.20180663

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Electrical performance of MFC-MEC coupling system and treatment of heavy metal wastewater containing cadmium

Energy and environmental engineering | 更新时间：2020-06-24

- Electrical performance of MFC-MEC coupling system and treatment of heavy metal wastewater containing cadmium
- CIESC Journal Vol. 70, Issue 1, Pages: 242-250(2019)
- 作者机构：
  
  江苏理工学院环境工程系，江苏常州 213001
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180663
  CLC： X 703.1
- Received：19 June 2018，
  
  Revised：2018-10-23，
  
  Published：05 January 2019
- 稿件说明：
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潘璐璐, 吴丹菁, 刘维平. MFC-MEC耦合系统产电性能及处理含镉重金属废水的研究[J]. 化工学报, 2019, 70(1): 242-250

PAN Lulu, WU Danjing, LIU Weiping. Electrical performance of MFC-MEC coupling system and treatment of heavy metal wastewater containing cadmium[J]. CIESC Journal, 2019, 70(1): 242-250
潘璐璐, 吴丹菁, 刘维平. MFC-MEC耦合系统产电性能及处理含镉重金属废水的研究[J]. 化工学报, 2019, 70(1): 242-250 DOI： 10.11949/j.issn.0438-1157.20180663.

PAN Lulu, WU Danjing, LIU Weiping. Electrical performance of MFC-MEC coupling system and treatment of heavy metal wastewater containing cadmium[J]. CIESC Journal, 2019, 70(1): 242-250 DOI： 10.11949/j.issn.0438-1157.20180663.

摘要

以厌氧活性污泥为阳极菌种，乙酸钠为阳极底物，硫酸铜和重铬酸钾溶液为微生物燃料电池（MFC）阴极液，人工模拟含镉重金属废水为微生物电解池（MEC）阴极液，构建MFC-MEC耦合系统，利用MFC的产电驱动MEC运行，在不消耗外部能源的情况下，实现含镉重金属废水中Cd

的去除。实验研究了MFC反应器容积、MFC堆栈、MEC电极材料、MEC阴极液pH对MFC-MEC耦合系统电性能及含镉重金属废水处理效果的影响。结果表明：MFC反应容积的扩大可以提高其产电性能，但与此同时会造成MFC的内阻升高，随着MFC容积的增加，MEC中Cd

去除率逐渐增加，但同时MFC阴极Cr

去除率逐渐下降；MFC堆栈可以提高工作组两端电压，串联时最大输出电压为1509 mV，Cd

去除率为69.3%；以钛板作为MEC电极时，微生物能有效附着在阳极表面，MFC阳极COD去除率为85%，MEC中Cd

去除率为51.5%；MEC阴极液pH在3~5时，有利于含镉重金属废水的处理，Cd

去除率80%以上。经XRD分析，MEC阴极还原产物为CdCO

。

Abstract

The MFC-MEC coupling system was constructed by using anaerobic activated sludge as the anode species

sodium acetate simulated wastewater as the anode substrate

copper sulfate and potassium dichromate solutions as the microbial fuel cell (MFC) catholyte

artificially simulate heavy metal wastewater containing cadmium as microbial electrolytic cell (MEC) catholyte. The MFC was used to drive the MEC to realize the removal of Cd

in heavy metal wastewater containing cadmium. The effects of the MFC reactor volume

MFC stack

MEC electrode material

MEC catholyte pH on the electrical properties of the MFC-MEC coupled system and the treatment of heavy metal wastewater containing cadmium were investigated. The results show that the enlargement of MFC reaction volume could improve the electricity production performance

but at the same time it would also increase the internal resistance of MFC. With the increase of MFC volume

the removal rate of Cd

in MEC increased gradually

but at the same time

the removal rate of Cr

in MFC cathode decreased gradually; MFC stack could increase the voltage

the maximum output voltage was 1509 mV in series

and the removal rate of Cd

was 69.3%; when the titanium plate was used as the MEC electrode

the microorganism could effectively adhere to the anode surface

the removal rate of COD of the MFC anode was 85%

the removal rate of Cd

in the MEC was 51.5%; when the pH of MEC catholyte was 3—5

it was beneficial to the treatment of heavy metal wastewater containing cadmium

and the removal rate of Cd

was over 80%. By XRD analysis

the cathode reduction product of MEC is CdCO

关键词

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