多相纳秒脉冲放电协同二氧化钛系统对大肠杆菌的灭活  

Inactivation of E.coli in Multiphase Nanosecond Pulsed Discharge Cooperative TiO_2 System

作　　者：孙明[1] 杜审言 徐海洋[1] 朱志鹏[1] 

机构地区：[1]上海海事大学静电研究所,上海200135

出　　处：《高电压技术》2016年第8期2487-2493,共7页High Voltage Engineering

基　　金：国家自然科学基金(51207089);上海海事大学研究生创新基金(2015ycx012)~~

摘　　要：基于压舱水处理技术的研究,利用多相纳秒脉冲放电协同二氧化钛(Ti O2)系统产生的强氧化性活性物质、冲击波、紫外光和强电场等对污水中的有害微生物进行有效灭活。实验中以大肠杆菌为目标灭菌物,通过多相纳秒脉冲放电来获取低温等离子体并和Ti O2光催化剂相结合。采用单喷嘴-筒式放电结构,研究了不同脉冲峰值电压、脉冲重复频率、鼓入气体体积流量、Ti O2镀膜长度、放电处理时间、大肠杆菌的初始浓度等条件对大肠杆菌灭活效果的影响。研究结果表明:当脉冲峰值电压为31 k V、脉冲重复频率为50 Hz、鼓入气体体积流量为80m L/min、Ti O2镀膜长度为1.0 cm、放电处理时间为10 min时,大肠杆菌的灭活率达到99.88%;大肠杆菌的剩余量随着脉冲峰值电压、脉冲重复频率、放电处理时间的增大而减小;随着大肠杆菌初始浓度的增加而增大;随着鼓入气体体积流量的升高而先减小后增大;随着Ti O2镀膜长度的增加而先减小后基本不变。Strong oxidizing active species, shock wave, ultraviolet-light and strong electric field in multiphase nanosecond pulse discharge cooperative titanium dioxide system can be effectively applied to inactivate microorganism in the sewage base on project study of ballast water treatment technology. We obtained low-temperature plasma through multiphase nanosecond pulsed discharges and combined with photo-catalysis TiO2, conduct inactivation experiments with E.coli as the target. Effects of the peak voltage and repetition frequency of pulses, the ventilation gas volume flow rate, the length of the TiO2 coating film, the discharge treatment time and E.coli initial concentration on the E.coli inactivation were investi- gated with a nozzle-cylinder electrode. The results show that the inactivation rate of E.coli reached 99.88% when the parameters were set to be pulse peak voltage of 31 kV, pulse repetition frequency of 50 Hz, ventilation gas flow rate of 80 mL/min, TiO2 coating length of 1.0 cm and discharge treatment time of 10 min. With peak voltage, pulse repetition frequency and discharge treatment time increasing, the surplus of E.coli reduced, but it increased with E.coli initial concentration. With the rise of ventilation gas volume flow rate, the surplus of E.coli reduced firstly, and then increased, meanwhile it could keep the surplus of E.coli reduced firstly, and then unchanged with add coating length of the TiO2.

关 键 词：放电等离子体 喷嘴-筒式反应器 大肠杆菌 灭活 二氧化钛 脉冲放电 

分 类 号：O539[理学—等离子体物理]