水中气泡脉冲放电处理硝基苯废水的实验研究

Experimental Research on Degradation of Nitrobenzene in Water by Pulse Plasma Discharge in Bubble Water

针对工业硝基苯废水处理的特点,研究了脉冲高电压放电条件下采用尖-板电极反应器处理硝基苯废水的实验效果。通过一系列的对比实验考察了放电时间、施加电压、溶液电导率、废水溶液pH值、溶液初始浓度、以及通入的气体成分等因素对硝基苯溶液降解率的影响;通过水中气泡脉冲放电的质谱图分析了该放电形式下的降解效果。脉冲放电降解硝基苯模拟废水的实验结果表明:酸性条件有利于硝基苯的降解;电压脉冲的幅值越大或频率越高,降解效果越好;往反应器中通入氧气的降解效果要远胜于通入空气或氮气;硝基苯废水的初始浓度越高,降解效率越高;反应后的溶液温度可作为反应器内脉冲放电激烈程度的一个表征量,良好的放电条件下,硝基苯的降解与溶液温升成正比。质谱检测的结果表明:水中气泡脉冲放电处理能对硝基苯分子深度降解,但相应的降解率不高。

For the degradation of nitrobenzene in industrial waste Water, we studied the nitrobenzene waste water under pulse plasma using needle to-plane electrode reactor, and analyzed the influences of voltage, solution conductivity, pH value, initial density, as well as gas import of the solution on the efficiency of nitrobenzene through a series of contrast experiments. Through the mass spectrum picture of pulse plasma discharge in bubble water, we deduced the influence of reaction on the degrada.tion of nitrobenzene in water. The experimental results of using pulse plasma to dispose nitrobenzene simulation waste water indicate that, the acidic condition, higher voltage pulse, import the oxygen toward the reactor and higher initial density are favourable for the nitrobenzene degeneration. The solution temperature after the reaction can be an attribute quantity for analyzing the pulse electric discharge intense degree. Under the condition of good electric discharge, the nitrobenzene degeneration is directly proportional to the finally solution temperature. The GC and MS analyses indicates that the pulse electric discharge in bubble water has a deep processing and low efficiency.