Abstract A series system with multi-stage reverse electrodialysis reactor (REDR) can harvest salinity gradient energy (SGE) from working fluids as much as possible to treat organic wastewater. In this paper, the series system simulated with a single REDR system to degrade azo dye wastewater was investigated experimentally. The results showed that the series system could not only degrade azo dye wastewater effectively, but also output a certain of electric energy simultaneously. In the series system, the salinity gradient variations of working fluids which flowing through each stage REDR affected only on the output voltage of each stage REDR, but which almost did not affect on the decolorization efficiency of azo dye wastewater of each stage REDR. However, the output current variations of the series system effected significantly on the decolorization efficiency. Although the increase of output current was benefit to the decolorization efficiency for each reactor in the series system, the number of reactors in the series system will reduce quickly, which results in total decolorization rate of azo dye wastewater decrease. When the current was 0.1A, the overall performances of the series system would be relatively optimal under the experimental conditions. The number of reactors, total decolorization rate of azo dye wastewater, utilization efficiencies of SGE and membrane area, and net output power could reach 19, 1.91 mg·s−1, 6.92 mg·J−1, 31.21 mg·m−2s−1 and 0.68 W, respectively.

中文翻译：

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输出电流对多级反电渗析反应器串联系统偶氮染料废水脱色效率的影响

摘要 多级反电渗析反应器（REDR）串联系统可以尽可能多地从工质中获取盐度梯度能（SGE）来处理有机废水。在本文中，实验研究了用单个REDR系统模拟的串联系统降解偶氮染料废水。结果表明，该串联系统不仅能有效降解偶氮染料废水，同时还能输出一定的电能。在串联系统中，流经各级REDR的工质的盐度梯度变化仅对各级REDR的输出电压产生影响，而对各级REDR偶氮染料废水的脱色效率几乎没有影响。然而，串联系统的输出电流变化对脱色效率有显着影响。虽然输出电流的增加有利于串联系统中各反应器的脱色效率，但串联系统中反应器的数量会迅速减少，从而导致偶氮染料废水的总脱色率下降。当电流为0.1A时，串联系统的整体性能在实验条件下相对最佳。反应器数、偶氮染料废水总脱色率、SGE利用率和膜面积、净输出功率可达19台、1.91 mg·s−1、6.92 mg·J−1、31.21 mg·m−2s−分别为 1 和 0.68 W。虽然输出电流的增加有利于串联系统中各反应器的脱色效率，但串联系统中反应器的数量会迅速减少，从而导致偶氮染料废水的总脱色率下降。当电流为0.1A时，串联系统的整体性能在实验条件下相对最佳。反应器数、偶氮染料废水总脱色率、SGE利用率和膜面积、净输出功率可达19台、1.91 mg·s−1、6.92 mg·J−1、31.21 mg·m−2s−分别为 1 和 0.68 W。虽然输出电流的增加有利于串联系统中各反应器的脱色效率，但串联系统中反应器的数量会迅速减少，从而导致偶氮染料废水的总脱色率下降。当电流为0.1A时，串联系统的整体性能在实验条件下相对最佳。反应器数、偶氮染料废水总脱色率、SGE利用率和膜面积、净输出功率可达19台、1.91 mg·s−1、6.92 mg·J−1、31.21 mg·m−2s−分别为 1 和 0.68 W。在实验条件下，串联系统的整体性能将是相对最佳的。反应器数、偶氮染料废水总脱色率、SGE利用率和膜面积、净输出功率可达19台、1.91 mg·s−1、6.92 mg·J−1、31.21 mg·m−2s−分别为 1 和 0.68 W。在实验条件下，串联系统的整体性能将是相对最佳的。反应器数、偶氮染料废水总脱色率、SGE利用率和膜面积、净输出功率可达19台、1.91 mg·s−1、6.92 mg·J−1、31.21 mg·m−2s−分别为 1 和 0.68 W。