摘要
报道了将超声空化效应应用于降解焦化废水中有机物的方法,考查了饱和气体的存在与否、有机物(CODCr)的初始浓度、超声波的声能密度、废水的初始pH值以及废水的温度对超声空化效应降解废水中有机物效果的影响。通过测定自由基清除剂正丁醇对有机物超声降解过程的影响,提出了废水中有机物超声降解的作用机理可能是由超声空化效应在水中产生的·OH自由基使水中的有机物被氧化的过程,有机物的超声降解过程遵循表观一级反应动力学规律。
A method for the decomposition of the organic compounds of coke plant wastewater by ultrasonic cavitation was presented. The factors dominating the decomposition efficiencies of the organic compounds, such as the presence of saturated air atmosphere, the initial CODCr concentrations, the ultrasonic energy densities, the initial pH values and the temperatures of the wastewater, were examined. The experimental results show that the decomposition efficiencies of the organic compounds by ultrasonic cavitation increase with the presence of saturated air atmosphere, the decrease of initial CODCr concentrations, and the increase of ultrasonic energy densities, and decreases greatly in the presence of n-butyl alcohol, which are an effective scavenger of free radicals. However, the wastewater temperature has only little effect on the decomposition efficiencies of the organic compounds. The GC/MS analysis further confirmed that most of the organic compounds in the wastewater were effectively decomposed by ultrasonic cavitation. It is concluded that the ultrasonic cavitation probably becomes a new method to decompose the organic compounds in the coke plant wastewater. The mechanism of the ultrasonic decomposition of the organic compounds would be that OH free radicals generated by ultrasonic cavitation in the wastewater make the organic compound oxidized. The ultrasonic decomposition process of the organic compounds follows the pseudo first-order kinetics.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2004年第3期344-350,共7页
Journal of Chemical Engineering of Chinese Universities
基金
云南省自然科学基金资助(2001E0019M)
关键词
超声波
空化效应
降解
焦化废水
有机物
作用机理
动力学
Coke plants
Decomposition
Mechanisms
Organic compounds
Reaction kinetics
Ultrasonic waves
