脉冲电弧液相放电等离子体污水消毒灭菌

Sterilization for wastewater by non-thermal plasma with pulsed arc electro-hydraulic discharge

采用某污水厂的出水,利用脉冲电弧液相放电等离子体技术,研究了放电脉冲次数、放电电压、放电极间距对大肠杆菌灭杀的影响。结果表明:随着放电脉冲次数的增加,灭菌率升高。当放电脉冲次数为400时,灭菌率高达99.1%。随着放电电压的升高,大肠杆菌的去除率升高,其中电压为3 kV最高,灭菌率为96.7%。在相同的电压下,放电极间距越小,灭菌效率越高,放电间距0.5 mm时最佳。利用扫描电镜观察等离子体处理前后大肠杆菌细胞的形貌变化,并根据灭菌的结果对等离子体的灭菌机理进行了分析,发现了灭菌消毒与等离子体中所含的活性粒子成分有密切的关系。

The discharge time,discharge voltage and polar distance were investigated while treating Escherichia coli from a wastewater treatment plant by non-thermal plasma with pulsed arc electro-hydraulic discharge.The results show that the sterilization rate of Escherichia coli was improved when the discharge time increased.The sterilization rate of Escherichia coli was 99.1% when discharge time was 400.Sterilization rate rose as discharge voltage increasing.When discharge voltage was 3 kV,sterilization rate of Escherichia coli was best,96.7%.The smaller the polar distance,the higher the sterilization rate at the same discharge voltage,and the best polar distance was 0.5 mm.Before and after plasma treatment,the Escherichia coli cell morphology was studied by scanning electron microscopy.According to the sterilization result,the sterilization mechanism was analyzed.It is found that the sterilization is relational to the active particles of the plasma.