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Kinetic study into the wet air oxidation of printing and dyeing wastewater

机译：印染废水湿空气氧化的动力学研究

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This paper presents the results of a study on the treatment of printing and dyeing wastewater from the textile industry by wet air oxidation (WAO). Experiments were conducted in a 21 autoclave batch reactor. The range of operating temperatures examined was between 423 and 573 K at an oxygen partial pressure of 1.69 MPa standardized at 298 K. Chemical oxygen demand (COD) were measured at regualr intervals during each experiment. Experimental data indicate that a certain amount of COD in the printing and dyeing wastewater can be removed by simple WAO. The extent of COD removal by the oxidation process increases with temperature until 523 K. Thermal decomposition during preheating was found to play a significant role in the COD removal with up to 18% COD removed at an operating temperature of 573 K. A first order kinetic model is proposed and tested for the removal of COD by WAO. The fit between the experimental data and the kinetic equation is good. The activation energy obtained is 37.5 kJ/mol K. The model prediction of overall COD removal agrees well with the experimental measurements. The results obtained here are useful for the design of WAO reactor and for the prediction of WAO performance in treating printing and dyeing wastewater.
机译：本文介绍了通过湿式空气氧化（WAO）处理纺织工业印染废水的研究结果。在21个高压釜间歇反应器中进行实验。在标准为298 K的氧气分压为1.69 MPa的情况下，所检查的工作温度范围为423至573K。在每个实验期间，均以定期间隔测量化学需氧量（COD）。实验数据表明，通过简单的WAO可以去除印染废水中的一定量的COD。氧化过程去除COD的程度随温度增加而增加，直到523K。发现预热过程中的热分解在COD去除中起着重要作用，在573 K的工作温度下去除了18％的COD。提出了该模型并测试了WAO去除COD的能力。实验数据和动力学方程之间的拟合良好。所获得的活化能为37.5 kJ / molK。总COD去除的模型预测与实验测量结果非常吻合。此处获得的结果可用于WAO反应器的设计和预测WAO在处理印染废水中的性能。

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