纳秒脉冲放电处理有机染料废水的实验研究_仇聪颖
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2020-03-31 10:09:53
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纳秒脉冲放电处理有机染料废水的实验研究*仇聪颖1,管显涛1,刘振1,朱安娜2,闫克平1(1.浙江大学工业生态与环境研究所,杭州310028;2.军事科学院防化研究院国民核生化灾害防护国家重点实验室,北京102205)摘要:随着印染行业的快速发展,印染废水的排放与日俱增。由于废水中的有机物具有成分复杂、难以降解的特点,若未经有效处理直接排放,会对生态环境造成严重的污染和危害。试验设计了一种多针-网式反应器循环处理有机组分为酸性红73(AR73)的模拟废水,其采用自行设计的基于TLT(TransmissionLineTransformer)的高压重频纳秒脉冲电源驱动。电源可以产生峰值电压为50kV,脉宽40ns,上升沿20ns的纳秒脉冲信号,工作频率可达500Hz。试验考察了峰值电压、放电频率、染料初始质量浓度及作用时间等因素对AR73降解效果的影响。为评价处理效果,采用紫外分光光度法分别测量了废水中剩余染料浓度、过氧化氢浓度等指标。结果表明,在初始浓度30mg/L,循环流量3.4L/min,放电间距30mm,峰值电压44.26kV,放电频率200Hz条件下处理30min,AR73降解率可以达到83.20%,单次脉冲注入能量为11.73mJ,过氧化氢浓度为47.36μmol/L,反应器脱色能效(G50)可以达到31.07g·kW−1·h−1。增大放电电压可以进一步提高AR73降解率,溶液中活性物质浓度提高,但是能量效率有所下降。关键词:纳秒脉冲;电晕放电;低温等离子体;染料降解;高级氧化中图分类号:X791文献标志码:Adoi:10.11884/HPLPB202032.190390DegradationoforganicdyesbynanosecondpulseddischargeplasmaQiuCongying1,GuanXiantao1,LiuZhen1,ZhuAnna2,YanKeping1(1.InstituteofIndustrialEcologyandEnvironment,ZhejiangUniversity,Hangzhou310028,China;2.ResearchInstituteofChemicalDefense,AcademyofMilitarySciencePLAChina,StateKeyLaboratoryofNBCProtectionforCivilian,Beijing102205,China)Abstract:Organiccompounds(especiallydyescompounds)aremajorpollutantsintheindustrialwastewaterandhavegainedagreatconcernduetotheirhazardousinfluenceontheenvironmentandmankind’shealth.Amultiplepin-planetypepulsedcoronadischargereactorwasusedtodegradeBrilliantCrocein(AcidRed73,AR73)continuously.ThereactorwasenergizedbyarepetitiveTLTbasednanosecondpulsedpowersource.Thesourcecanproducepulseswithapeakvoltageof50kV,apulsewidthof40ns,andarisetimeof20nsatarepetitionrateofupto500Hz.Toevaluatethedischargeperformance,residualdyeconcentrationandhydrogenperoxide(H2O2)wereanalyzedbyUVspectrophotometry.Thehighvoltageof44.26kVamplitudeandfrequencyof200Hzwereappliedtotheneedleswhilewastewaterfilmwasusedasthegroundelectrode.WhentheinitialconcentrationofAR73was30mg/Landtheflowratewas3.4L/min,thedegradationpercentageofAR73couldreachupto83.20%after30minutesoftreatmentwiththeneedle-waterdistanceof30mm.Underthiscondition,theinputenergyperpulsewas11.73mJ,theconcentrationofH2O2wa
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