Method for recovering multiple metals through driving microbial electrolysis cells by microbial fuel cells

Abstract

The invention relates to a method for recovering multiple metals through driving microbial electrolysis cells by microbial fuel cells, and belongs to the field of heavy metal recovery treatment. The method comprises the following steps: MFCsCr and MFCCu which adopt Cr(VI) and Cu(II) as cathode electron acceptors respectively are connected in series, the anodes of MFCsCr and MFCCu after series connection are connected with the cathode of MECsCd adopting Cd(II) as a cathode electron acceptor, the cathodes of the MFCsCr and MFCCu after series connection are connected with the anode of MECsCd through a series resistor, the cathodes of MFCsCr and MFCCu are carbon rods, the cathode of MECsCd is a stainless steel wire or a titanium sheet, and the anodes of MFCsCr, MFCCu and MECsCd are carbon felts or carbon rods. Through the adoption of the method, organic sewage such as electroplating wastewater, printed circuit board etching wastewater and municipal wastewater can be treated, and Cr metal, Cu metal and Cd metal are recovered, and broad space is provided for expanding the application field and the use range of an electrochemical system by MFCs output electric energy in situ.

Description

technical field [0001] The invention belongs to the field of recovery and treatment of heavy metals, in particular to a method for improving the recovery of polymetallics from a microbial fuel cell driven microbial electrolytic cell. Background technique [0002] Both microbial fuel cells (Microbial Fuel Cells, MFCs) and microbial electrolysis cells (Microbial Electrolysis Cells, MECs) include an anode chamber, an anode electrode, a cathode chamber, a cathode electrode, and a proton exchange membrane. The difference is that the Gibbs free energy of the reaction between the cathode and anode of MFCs is less than zero, the reaction can proceed spontaneously, and the system outputs electric energy; on the contrary, the Gibbs free energy of the reaction between the cathode and anode of MECs is greater than zero, and the reaction cannot be spontaneous To proceed, the outside world needs to input energy to drive the reaction to proceed. MFCs that use output power to drive MECs th...

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Problems solved by technology

[0005] In affecting MFCs Cr and MFCs Cu Drive MECs Cd Among the various factors of performance, MECs Cd The cathode electrode material plays a decisive role: the excellent MECs cathode material can make the potential applied to MECs reach the required potential for reducing Cd(II); on the contrary, when the used MECs cathode material cannot make the applied voltage reach the reduction Cd(II) ) at the desired potential, although MFCs Cr Tandem MFCs Cu Can reduce Cr(VI) and Cu(II) respectively, but cannot drive MECs Cd Reduction of Cd(II), resulting in incomplete recovery of heavy metals in electroplating wastewater

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