气液两相纳秒脉冲放电反应器放电特性及其对藻类的灭活效果

Discharge Characteristics of Gas-liquid Hybrid Nanosecond Pulse Discharge Reactor and Its Inactivation Effect on Algae

液相高压脉冲放电产生的强氧化性活性物质和紫外光、冲击波等可以有效地用于水处理。为此,以扁藻作为处理目标物,采用多喷嘴–板式水处理装置和气液两相纳秒负脉冲放电形式,分析了反应器电气特性、不同放电参数对扁藻杀灭率的影响。实验结果表明,随着脉冲峰值电压的增大,单脉冲能量随之增加;能量效率先增后减,在脉冲峰值电压为-7.6 k V时出现拐点,此时能量效率为34.1%。扁藻的杀灭率随着脉冲峰值电压、脉冲重复频率、放电处理时间的增加而增大;随着鼓气速率的增大,扁藻的杀灭率呈现先增后减的趋势。当脉冲峰值电压为-9.4 k V、鼓气速率为70 m L/min、循环速率为380 m L/min、放电处理时间为30 min、脉冲重复频率为70 Hz时,扁藻的杀灭率为100%。

Strong oxidizing active species,shock wave and ultraviolet-light in liquid phase high voltage pulse discharge can be effectively applied to the water treatment.Choosing platymonas subcordiformis as the treatment target, we used- nozzles-plate water treatment device and gas-liquid hybrid nanosecond pulse discharge to analyze the electric characteristics of reactor and the effects of discharge parameters on inactivation rate of platymonas subcordiformis. The results showed that, the single pulse energy increased with the pulse peak voltage, and the energy efficiency first increased and then reduced and the inflection point appeared when the pulse peak voltage being -7.6 kV with the energy efficien- cybeing 34.1%.The inactivation rate of platymonas subcordiformis increased with the pulse peak voltage, pulse frequency and the discharge duration time. When the ventilation gas rate increased, the inactivation rate of platymonas subcordifor- mis first increased and then reduced. The inactivation rate ofplatymonas subcordiformis could reach 100% with the pulse peak voltage, the ventilation gas rate, the circulation rate, the discharge duration time and the pulse repetition frequency being -9.4 kV, 70 mL/min, 380 mL/min, 30 rain and 70 Hz, respectively.