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Electrochemical oxidation as a final treatment of synthetic tannery wastewater

机译：电化学氧化作为合成制革废水的最终处理

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Vegetable tannery wastewaters contain high concentrations of organics and other chemicals that inhibit the activity of microorganisms during biological oxidations, so biorefractory organics that are not removed by biological treatment must be eliminated by a tertiary or advanced wastewater treatment. In this paper, the applicability of electrochemical oxidation as a tertiary treatment of a vegetable tannery wastewater was investigated by performing galvanostatic electrolysis using lead dioxide (Ti/PbO2) and mixed titanium and ruthenium oxide (Ti/TiRuO2) as anodes under different experimental conditions. The experimental results showed that both the electrodes performed complete mineralization of the wastewater. In particular, the oxidation took place on the PbO2 anode by direct electron transfer and indirect oxidation mediated by active chlorine, while it occurred on the Ti/TiRuO2 anode only by indirect oxidation. Furthermore, the Ti/PbO2 gave a somewhat higher oxidation rate than that observed for the Ti/TiRuO2 anode. Although the Ti/TiRuO2 required almost the same energy consumption for complete COD removal, it was more stable and did not release toxic ions, so it was the best candidate for industrial applications. With the Ti/TiRuO2 anode, the rate of tannery wastewater oxidation increased with the current density, pH, and temperature of the solution. These results strongly indicate that electrochemical methods can be applied effectively as a final treatment of vegetable tannery wastewater allowing the complete removal of COD, tannin, and ammonium and decolorization.
机译：蔬菜制革厂废水中含有高浓度的有机物和其他化学物质，它们在生物氧化过程中会抑制微生物的活动，因此必须通过第三级或高级废水处理方法消除未被生物处理去除的生物难熔有机物。本文通过在不同的实验条件下，以二氧化铅（Ti / PbO2）和混合的钛和氧化钌（Ti / TiRuO2）为阳极进行恒电流电解，研究了电化学氧化在蔬菜制革废水第三级处理中的适用性。实验结果表明，两个电极都完成了废水的完全矿化。特别地，氧化是通过直接电子转移和活性氯介导的间接氧化在PbO2阳极上发生的，而仅通过间接氧化在Ti / TiRuO2阳极上发生。此外，Ti / PbO2的氧化速率比Ti / TiRuO2阳极的氧化速率更高。尽管Ti / TiRuO2消耗几乎相同的能量才能完全去除COD，但它更稳定并且不会释放有毒离子，因此它是工业应用的最佳选择。使用Ti / TiRuO2阳极，制革废水的氧化速率随溶液的电流密度，pH和温度的升高而增加。这些结果强烈表明，电化学方法可以有效地应用于蔬菜制革废水的最终处理，从而可以完全去除COD，单宁和铵并脱色。

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