不同阴极液对微生物脱盐燃料电池性能的研究

Study on the Performance of Microbial Desalination Fuel Cell with Different Cathode Liquid

此次试验是利用双室型微生物燃料电池(MFC)处理电镀废水并且产生电能,同时对阴极液(电镀废水)中不同的重金属离子对产电效果的影响进行研究。构建的双室型微生物燃料电池(MFC)采用红糖作为底物,对活性污泥进行培养以及驯化。作为阴极液使用的电镀废水是分别含有相同浓度的锌离子,铜离子,银离子的溶液。经过几个周期的实验得出的数据分析得出结论,电镀废水可以作为双室型微生物燃料电池(MFC)的底物,并且产电效果有很大差异。在不同阴极液存在时双室型微生物燃料电池(MFC)产生电能的效果排序为银离子>铜离子>锌离子。其中锌离子作阴极溶液功率密度仅仅只有2.010^-6mW/m^2而铜离子溶液为阴极液的时候,则可以获得相对大一些的功率密度为14.0mW/m^2。在这三种分别含有等浓度的不同重金属离子的溶液中利用含有银离子的溶液作为双室型MFC的阴极液的时候,电池的产电效果最好。在电流密度为82.9mA/m^2时,其获得的最大功率密度为23.2mW/m^2,并且COD去除率以及重金属的去除率都是远远地高于含有锌离子的溶液和含有铜离子的溶液作为双室型微生物燃料电池(MFC)的阴极液。通过这次实验能够表明,可以通过利用双室型微生物燃料电池(MFC)对含有大量的重金属以及有机物的电镀废水进行处理,同时产生电能,实现经济和环境双效益。

This experiment is to use two-compartment microbial fuel cell(MFC)to treat electroplating wastewater and generate electric energy,and to study the influence of different heavy metal ions in cathode liquid(electroplating wastewater)on electrogeneration effect.The constructed two-compartment microbial fuel cell(MFC)USES brown sugar as the substrate for the cultivation and domestication of activated sludge.The electroplating wastewater used as cathode solution is a solution containing the same concentration of zinc ion,copper ion and silver ion respectively.After several cycles of experimental data analysis,it is concluded that electroplating wastewater can be used as the substrate of two-compartment microbial fuel cell(MFC),and the power generation effect is quite different.In the presence of different cathode liquids,the effect of two-compartment microbial fuel cell(MFC)on generating electric energy is ranked as silver ion>,copper ion>and zinc ion.The power density of zinc ion as the cathode solution is only 2.010^-6mW/m^2,while the power density of copper ion solution as the cathode solution is 14.0mW/m^2.When the solution containing silver ions is used as the cathode solution of two-compartment MFC in the three solutions containing different heavy metal ions of equal concentration respectively,the battery has the best power generation effect.When the current density is 82.9mA/m^2,the maximum power density obtained is 23.2mW/m^2,and the removal rate of COD and heavy metal is much higher than that of solution containing zinc ion and solution containing copper ion as cathode solution of two-compartment microbial fuel cell(MFC).Through this experiment,it can be demonstrated that two-compartment microbial fuel cell(MFC)can be used to treat electroplating wastewater containing a large amount of heavy metals and organic compounds,and generate electricity at the same time,achieving economic and environmental benefits.