湿地基质及阴极面积对人工湿地型微生物燃料电池去除偶氮染料同步产电的影响

发布时间：2018-02-26 14:47

  本文关键词： 人工湿地型微生物燃料电池 X-B 脱色 产电 湿地基质 阴极面积　出处：《环境科学》2017年05期 　论文类型：期刊论文

【摘要】：本研究采用人工湿地型微生物燃料电池处理偶氮染料X-3B,实现降解偶氮染料同步产电的效果.为了构建性能最优的人工湿地型微生物燃料电池(CW-MFC)系统,本研究主要从湿地基质和阴极面积两个方面研究系统构型对去除X-3B同步产电的影响,提高系统性能.研究表明以粒径10 mm、孔隙率30%的小石子作为湿地基质构造的CW-MFC系统微生物生物量最大,去除X-3B效果最好,脱色率高达92.70%,但其产电性能最差.较小的粒径和孔隙率使底层微生物生物量增加,促进X-3B的去除,但随着湿地基质粒径和孔隙率的减小,导致阴阳极营养物质不足,系统传质阻力增加,抑制了系统产电性能.X-3B的去除效果随着阴极面积的增加而提高直到阴极面积为594 cm~2时取得最大脱色率99.41%.当阴极面积继续增加时,CW-MFC系统产电性能上升趋势趋于平缓,X-3B去除效果呈现下降趋势,这是因为阴极反应过快导致更多的阳极电子输送到阴极用于产生电流,与X-3B发生反应的电子减少,阳极成为提高CW-MFC系统性能的限制因素.
[Abstract]:In this study, an artificial wetland microbial fuel cell was used to treat azo dye X-3B in order to produce electricity synchronously. In order to construct a CW-MFCsystem with optimal performance, an artificial wetland microbial fuel cell system was developed. In this study, the effects of system configuration on the removal of X-3B synchronous power generation were studied from two aspects of wetland substrate and cathode area. The results showed that the CW-MFC system with 10mm diameter and 30% porosity as the wetland substrate had the largest microbial biomass and the best removal efficiency was X-3B. The decolorization rate is up to 92.70%, but its electrical performance is the worst. The smaller particle size and porosity increase the biomass of the bottom microorganism and promote the removal of X-3B, but with the decrease of the particle size and porosity of the wetland matrix, there is a shortage of nutrients in the anode and cathode. System mass transfer resistance increases, With the increase of cathode area, the removal efficiency of the system. X-3B increases with the increase of cathode area until the maximum decolorization rate of 99.41% is obtained at 594 cm ~ 2:00. When the cathode area continues to increase, the rising trend of the electrical performance of CW-MFC system tends to be gentle. The removal efficiency of X-3B decreased, This is because the rapid cathodic reaction leads to more anode electrons being transported to the cathode to generate current, and the number of electrons reacting with X-3B decreases. The anode becomes the limiting factor to improve the performance of CW-MFC system.
【作者单位】： 东南大学能源与环境学院;
【基金】：国家水体污染控制与治理科技重大专项(2012ZX07101-005) 国家自然科学基金项目(21277024)
【分类号】：TM911.45;X788
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