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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Process Optimization of Electrochemical Oxidation of Ammonia to Nitrogen for Actual Dyeing Wastewater Treatment
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Process Optimization of Electrochemical Oxidation of Ammonia to Nitrogen for Actual Dyeing Wastewater Treatment

机译：氨氮电化学氧化处理印染废水的工艺优化

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To mitigate the potential environmental risks caused by nitrogen compounds from industrial wastewater, residual ammonia after conventional wastewater treatment should be further eliminated. In this work, an electrochemical oxidation process for converting ammonia to nitrogen in actual dyeing wastewater was investigated. The effects of the main operating parameters, including initial pH value, applied current density, NaCl concentration, and flow, were investigated on ammonia removal and products distribution. Experimental results indicated that, under optimal conditions of an initial pH value of 8.3, applied current density of 20 mA cm−2, NaCl concentration of 1.0 g L−1, and flow of 300 mL min−1, the ammonia could be completely removed with N2 selectivity of 88.3% in 60 min electrolysis. A kinetics investigation using a pseudo-first-order model provided a precise description of ammonia removal during the electro-oxidation process. Experimental functions for describing the relationships between kinetic constants of ammonia removal and main operating parameters were also discussed. Additionally, the mechanisms and economic evaluation of ammonia oxidation were conducted. All these results clearly proved that this electro-oxidation process could efficiently remove ammonia and achieve high N2 selectivity.
机译：为了减轻工业废水中的氮化合物引起的潜在环境风险，应进一步消除常规废水处理后的残留氨。在这项工作中，研究了一种将实际染色废水中的氨转化为氮的电化学氧化方法。研究了主要操作参数（包括初始pH值，施加的电流密度，NaCl浓度和流量）对氨去除和产物分布的影响。实验结果表明，在初始pH值为8.3的最佳条件下，施加的电流密度为20 mA cm -2 ，NaCl浓度为1.0 g L -1 ，流量为300 mL min -1 时，在60分钟的电解过程中，可以以88.3％的N2选择性完全去除氨。使用拟一阶模型进行的动力学研究提供了在电氧化过程中去除氨的精确描述。还讨论了用于描述脱氨动力学常数与主要运行参数之间关系的实验功能。此外，进行了氨氧化的机理和经济评价。所有这些结果清楚地证明了该电氧化过程可以有效地去除氨并实现高的N 2选择性。

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