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1、------------------------------------------------------------------------------------------------芘污染土壤的脉冲放电等离子体修复分析第41卷第1期:257-2612015年1月31日DOI:10.13336/j.1003-6520.hve.2015.01.035高电压技术HighVoltageEngineeringVol.41,No.1:257-261January31,2015吴春笃,赵文信,王慧娟,耿聪,吕坤,依成武(江苏大学环境与安全工程学院,镇江212013)摘要:脉冲放电等离子体作用
2、于难生物降解有机污染物表现出高氧化性。土壤污染物中,多环芳烃具有高稳定性特征。为此,以典型多环芳烃——芘为目标物,建立了多针?网电极形式的脉冲放电等离子体土壤修复体系,考察了该体系用于芘污染土壤修复时其主要电气参数如脉冲峰值电压、脉冲频率和电极间距,以及系统空气载气速率等变化对修复体系中芘降解速率的影响规律。制成的模拟芘污染土壤中,芘的初始质量分数为0.01%。研究结果表明:建立的芘污染土壤修复体系中,升高脉冲峰值电压和脉冲频率可以提高修复体系的输出功率,有利于修复体系中芘的降解;加大电极间距不利于修复体系中芘的降解,10mm的电极间距条件下该修复体系中芘的降解速率较高;相较0和2L/m
3、in,该修复体系采用1L/min的空气体积流量时的芘降解效果最佳。关键词:脉冲放电等离子体;多针?网电极;土壤;修复;芘;降解速率AnalysisofPulsedDischargePlasmaSystemêsRemediationin——————————————————————————————————————------------------------------------------------------------------------------------------------PyrenePollutedSoilWUChundu,ZHAOWenxin,WANGHuij
4、uan,GENGCong,LüKun,YIChengwu(SchooloftheEnvironment,JiangsuUniversity,Zhenjiang212013,China)Abstract:Amongthepollutantsinsoil,polycyclicaromatichydrocarbons(PAHs)aretheoneswithhighstability.Therefore,usingpyrene,atypicalPAHpollutant,astheobject,webuiltapulsed-dischargeplasma-generatingsystemwithn
5、eedles-to-netelectrodegeometrytotreatsoilpollutedbypyrene,andinvestigatedinfluencesofthepeakpulsevol-tage,pulsefrequency,electrodedistance,andairbubblingrateofthesystemonitsefficiencyinpyrenedegradation.Thesampleofpollutedsoilusedintheremediationsystemhasaninitialmassconcentrationofpyreneof0.01%.
6、Thetestre-sultsshowthat,inthesystem,thedegradationrateofpyreneincreaseswithpulsedpeakvoltageandpulsefrequency,whichismainlyduetotheincreaseofoutputpower.Meanwhile,increasingthedistancebetweenelectrodesdoesnothelptoincreasethedegradationrate;thesystemhasthehighestdegradationvelocitywiththedistance
7、of10mm.Thedegrada-tionrateishigheratairbubblingrateof1L/minthanat0and2L/min.Keywords:pulseddischargeplasma;multi-needle-to-netelectrode;——————————————————————————————————————--------------------------------------------