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该实验的研究对象为连续流双室微生物燃料电池,同时考察连续流微生物燃料电池的污水处理、发电和重金属离子(Cu~(2+)、Ni~(2+)、Cr~(6+)、Cd~(2+)电镀废水,500 mg/L)的处理回收效果并与传统单室微生物燃料电池进行对比。在厌氧环境下以微生物本身作为催化剂,利用人工配成的糖蜜废水作为阳极底物,不同有毒重金属离子溶液作为阴极底物。试验结果表明,在外电阻(1 000Ω)相同的情况下得到Crr~(6+)电镀废水作为阴极时的产电性能最佳,获得最大电压U=114.2 mV,功率密度P=35.648 8 mW/m~2,库伦效率CE=44.13%,同时得到最高金属离子去除率66%。相比之下Cu~(2+)阴极液组产电效果较差,电压稳定值不足0.01 V,功率密度P=6.059 m W/m~2与库伦效率CE=3.78%均为最低值。在阳极均实现了对模拟糖蜜废水的降解,处理效果最显著的是Cd~(~(2+))阴极液组,COD去除率达到78%。最后对MFC阴极还原产物进行了X射线衍射分析,得到Cu~(2+)还原产物包括Cu_2O与铜单质,Crr~(6+)主要被还原成Cr_2O_3,Cd~(2+)与Ni~(2+)主要生成单质状态。采用X射线衍射分析阴极电极还原物质,经计算机检索与国际标准PDF对照。得到4组不同阴极液中,Cu~(2+)被还原生成Cu_2O晶体与单质铜。Ni~(2+)被还原生成镍单质。而Cr~(6+)与Cd~(2+)阴极液组中分别出现Cr_2O_3与单质镉的晶体衍射峰。
The object of this experiment was continuous flow bi-room microbial fuel cell, and the effects of wastewater treatment, power generation and heavy metal ions (Cu 2+, Ni 2+, Cr 6+) in continuous flow microbial fuel cell , Cd 2+ electroplating wastewater, 500 mg / L), and compared with the traditional single-chamber microbial fuel cell. Under the anaerobic environment, the microorganism itself is used as a catalyst, and artificial mixed molasses wastewater is used as an anode substrate. Different toxic heavy metal ion solutions are used as a cathode substrate. The experimental results show that Cr (superscript 6+) electroplating wastewater is the best cathode material when the external resistance (1000Ω) is the same. The maximum voltage U = 114.2 mV and the power density P = 35.648 8 mW / m ~ 2, Coulomb efficiency CE = 44.13%, at the same time get the highest metal ion removal rate of 66%. In contrast, the cathodic liquid Cu 2+ produced less electricity, the voltage stability value was less than 0.01 V, and the power density P = 6.059 m W / m 2 and Coulomb’s efficiency CE = 3.78%. At the anode, the degradation of simulated molasses wastewater was realized. The most obvious treatment effect was Cd ~ (2+) catholyte, with a COD removal rate of 78%. Finally, the cathodic reduction products of MFC were analyzed by X-ray diffraction, and the Cu ~ (2 +) reduction products including Cu_2O and Cu were obtained. Crr ~ (6 +) was mainly reduced to Cr_2O_3, Cd_2 and Ni ~ 2+) mainly produces elemental state. The cathodic electrode reductants were analyzed by X-ray diffraction and compared with the international standard PDF by computer. In 4 different cathode solutions, Cu ~ (2+) was reduced to Cu_2O crystal and elemental copper. Ni ~ (2+) is reduced to form nickel simple substance. The crystal diffraction peaks of Cr 2 O 3 and elemental cadmium appear in Cr 6+ and Cd 2+ catholyte groups, respectively.