双层阳极微生物燃料电池系统降解偶氮染料及同步产电

来源期刊:中南大学学报(自然科学版)2019年第2期

论文作者:李先宁 汪莲 曹羡 冯羽中 张毅

文章页码:264 - 272

关键词:微生物燃料电池;偶氮染料;生物产电;脱色降解

Key words:microbial fuel cell; azo dye; bio-electricity production; decolorization and degradation

摘    要:构建一种新型单室双阳极微生物燃料电池(MFC)系统并用于处理难降解有机染料废水;研究进水染料质量浓度、水力停留时间和双层阳极间距对难降解有机物去除率和系统产电性能的影响;利用UV-Vis光谱扫描和气相色谱-质谱联用(GC-MS),分析降解过程中的一系列降解产物。研究结果表明:当系统通入200~600 mg/L的染料活性艳红X-3B时,单阳极和双阳极MFC系统的有机物去除效率并无较大差异,最大脱色率之差不超过10%;当系统通入800~1 000 mg/L的X-3B时,双阳极MFC系统表现出较好的脱色效果和较强的有机负荷耐受能力;当2个阳极层间距设为10 cm时,双阳极MFC系统(简称S-10系统)的处理性能最佳;当水力停留时间为1.5 d,进水X-3B质量浓度为1 000 mg/L时,S-10系统的脱色率可达96.34%,化学需氧量(COD)去除率为74.16%;上、下阳极的最大功率密度分别为0.150 W/m3和0.121 W/m3,系统内阻为1 053.1 Ω;苯胺是一种典型的X-3B降解中间产物。

Abstract: A novel single-chamber dual-anode microbial fuel cell (MFC) system was constructed for the treatment of refractory organic dye-production wastewater. The effects of dye mass concentration, hydraulic retention time (HRT) and anode spacing on the removal efficiency of refractory organic matters and bio-electricity production were investigated. UV-Vis spectral scanning and gas chromatography-mass spectrometry (GC-MS) were used to analyze the degration products. The result show that when the MFC system is fed with X-3B of 200-600 mg/L, the single-anode MFC and dual-anode MFC have no significant differences in removal efficiencies of organic matters, and the difference between the maximum decolorization rate of two MFC systems does not exceed 10%. When MFC system is fed with 800-1 000 mg/L X-3B, the dual-anode MFC exhibits good decolorization effect and strong organic load capacity. When the anode spacing is 10 cm, dual-anode MFC system (namely S-10 system) presents the best processing performances. With 1 000 g/L X-3B and HRT of 1.5 d, S-10 system exhibits highest decolorization efficiency of 96.34% and the highest chemical oxygen demand (COD) removal efficiency of 74.16%. The internal resistance of S-10 system is 1 053.1 Ω, and the maxmium power densities of the upper and lower anodes are 0.150 and 0.121 W/m3, respectively. It is found that aniline is a typical X-3B degradation intermediate product.

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