高含量苯酚废水的湿式氧化反应动力学研究

STUDY ON KINETICS OF WET AIR OXIDATION OF HIGH-CONCENTRATION PHENOL WASTEWATER

以初始有机物、中间产物以及最终产物为集总组分,废水的COD为集总参数,建立苯酚废水湿式氧化(WAO)反应的广义动力学计算模型,结合实验结果探讨了各反应途径下的反应速率常数、反应表观活化能和指前因子。结果表明,在苯酚的WAO反应过程中较易生成中间产物,且中间产物较难进一步氧化。当反应温度低于210℃时,初始有机物主要向中间产物方向转化,而随温度提高,初始有机物更趋向于向最终产物方向转化。广义动力学模型可以较好地预测苯酚废水的WAO反应过程并对反应结果进行预测,为该类废水的WAO工艺及设备的设计提供了充分的理论依据。

Based on the initial organic substances, intermediates and final products for lumping components, and the COD value of the wastewater as lumping parameters, the generalized kinetic model of wet air oxidation （WAO） of phenol wastewater was established. In combination with the experimental results, reaction rate constant, activation energies and frequency factors were discussed under various reaction pathways. The results showed that in the p rocess of phenol WAO reaction, intermediates were easily produced and was relatively difficult to be oxidized. When the reaction temperature was below 210 ℃, the initial organic substances were mainly transferred into intermediates, and the initial organic substances tended to be transferred into final products with temperature increasing. The generalized kinetic model could well predict the process of WAO reaction of phenol wastewater as well as the reaction results, which provided a sufficient theoretical basis for the design of the WAO process and equipment of this kind ofwastewater.