气液滑动弧等离子体降解高浓度有机废水的研究

TREATMENT OF HIGH ORGANIC WASTEWATER BY GAS-LIQUID GLIDING ARC DISCHARGE

采用气液滑动弧放电非平衡等离子体进行降解高浓度苯酚模拟废水(初始浓度为872 mg／L)的研究。实验研究表明:由于液滴的存在改变了电极间的介电常数和局部电场,气液滑动弧放电的电压波形比纯气流滑动弧放电更加不规则,起弧电压更低;采用氧气作为载气能提高苯酚的降解效果,最后TOC值为44 mg／L;增大气液混合比,相应的加强了废水的雾化效果,增大水气接触表面积,进而提高了苯酚的降解效果;在尾气中检测到CO2的存在,最高浓度达到35357 mg/m3。

A method, wastewater is directly treated by gas-liquid gliding arc non-equilibrium plasma produced by high voltage, is used to degradate high concentration phenol solution. The results show that, because of the existence of water droplets that changes the effective permittivity and local electric field between electrodes, the voltage waveform of gas-liquid gliding arc discharge is more anomalistic than the gas condition. And the breakdown voltage of liquid-gas gliding arc discharge is low. Oxygen as carrying gas can increase the degradation of phenol and the final total organic carbon (TOC) of solution is 44 mg/L (the initial TOC is 872 mg/L). Increasing gas-liquid mixing rate could also increase the degradation of phenol. The occurrence of CO2 is measured during the plasma treatment process and the maximum concentration is 35357 mg/m3.