超临界水氧化法去除废水COD的动力学研究
Study on the Kinetic of the Removal of COD in Wastewater by Supercritical Water Oxidation
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摘要: 用超临界水氧化法(SCWO)处理有机废水,去除其COD?在高于水临界点(Tc=647K,Pc=22MPa)的温度和压力(673～813K,28～35MPa)下,用氧气作为氧化剂且过量,对含多元酚类等有机物的废水进行氧化处理?研究了超临界水氧化法处理废水时COD的去除动力学?在实验条件下,废水COD的去除动力学对COD是一级?氧气是零级;其速率常数与温度的关系符合Arrhenius公式;压力也明显地影响速率常数,随压力的升高而增大;反应的活化体积不是一常数?Abstract: The kinetic of the COD removal of the waste water by supercritical water oxidation (SCWO) was studied in a continuous flow reactor at 673～813K and 28～35MPa with oxygen as the oxidant.The global rate law of COD removal are first order in COD and zero order oxygen.The relation between the global rate constant and temperature could be satisfactorily described by Arenius Law.The increment of pressure could obviously enlarge the global rate constant.The activation volume of the reaction is not a constant.
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