Electrochemical oxidation as a final treatment of synthetic tannery wastewater.
Electrochemical oxidation as a final treatment of synthetic tannery wastewater.
复制标题
DOI：
10.1021/es049730n
复制
发表时间：
2004-09
影响因子：
11.4
通讯作者：
M. Panizza;G. Cerisola
中科院分区：
文献类型：
--
作者：
M. Panizza;G. Cerisola
植物制革废水含有高浓度的有机物和其他化学物质，这些化学物质在生物氧化过程中抑制微生物的活性，因此生物处理无法去除的生物难降解有机物必须通过三级或高级废水处理来消除。以二氧化铅（Ti/PbO 2）和钛钌混合氧化物（Ti/TiRuO 2）为阳极，在不同的实验条件下，研究了电化学氧化法深度处理制革废水的适用性。实验结果表明，两种电极对废水都进行了完全矿化。PbO 2阳极的氧化主要通过直接电子转移和活性氯介导的间接氧化进行，而Ti/TiRuO 2阳极的氧化主要通过间接氧化进行。此外，Ti/PbO 2给出了比Ti/TiRuO 2阳极所观察到的氧化速率稍高的氧化速率。虽然Ti/TiRuO 2完全去除COD所需的能耗几乎相同，但它更稳定，不会释放有毒离子，因此它是工业应用的最佳候选者。Ti/TiRuO 2阳极氧化制革废水的速率随电流密度、溶液pH和温度的增加而增加。这些结果有力地表明，电化学方法可以有效地应用于植物制革废水的最终处理，允许完全去除COD，单宁，铵和脱色。
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.