高压脉冲放电去除废水中氰化物的研究

华中科技大学硕士学位论文高压脉冲放电去除废水中氰化物的研究姓名：章英慧申请学位级别：硕士专业：环境工程指导教师：李胜利20050508IpH1pH813pH21.0L/minpH10.0397.59%341.0L/min60pH81360120pH89pH1011125pH812pH1112pH67pH811IIAbstractInthispaper,weusenon-thermalplasmageneratingbyhighvoltagenanosecondpulsetotreatcyanide-containingwastewater.Wedesignandusetwokindsofreactorstodischargeandtreatwastewater,oneisstring-stringelectrode,theotherisneedle-boardelectrode.TheexperimentcomparedtheremovalefficienciesofCNbysingle-phaseliquiddischargewithtwo-phasemixturedischarge.ManyfactorswerediscussedincludingpHvaluereactiontimefluxofgasdischargingconditions.Weobtainedsomeresultsasfollow:1)TheremovalefficienciesofCNgoupgraduallywithpHvaluedecreasingandreactiontimeprolongingwhenpHvalueisrangefrom8to13.2)TheremovalefficienciesofCNincreaseswithairflowrateaddingcontinuously.Airflowratel=1.0L/minpH=10.03,TheremovalefficienciesofCNcanachieve97.59%.3)Higherisdischargevoltage,betterisremovalresultofcyanide-containingwastewater.4)Infrontof60minutes,theremovalefficienciesofCNishigherbyusingneedle-boardelectrodereactortodischargeandtreatingthanbyusingstring-stringelectrodereactorwhileairflowrateis1.0L/minandpHvalueisrangefrom8to13.Inthesameofairflowratewhichis1.0L/minandreactiontimewhichisin60-120minutes,pHvalueisrangefrom8to9,thetreatingresultofCNofstring-stringelectrodereactorisbetterthanthatofneedle-boardelectrodereactor.WhilepHvalueisrangefrom10to12,treatingresultofCNbyusingstring-stringelectrodeisworsethanbyusingneedle-boardelectrode.5)WhenpHvalueisrangefrom8to12,removaleffectofCNisthebestwhenletairflowintoreactortodischarge,secondisnitrogengas.Thatistosay,theremovaleffectofCNbydischargingwithnoairisworsethanbydischargingwithnitrogengasexceptpHIIIvalueis11.Theremovalefficiencieswithnogasdischargingisthelowest.6)RemovaleffectofCNisgoodintenminuteswhenmixturegasofSO2andN2.TheremovalefficienciesofCNchangessmallwithreactiontimeextendingafterreactingtenminutes.7)WhenpHvalueisrangefrom8to11,valueofvolatilizingcyanidesbystring-stringelectrodetreatingistallerthanthatbyneedle-boardelectrodereactortreating.Keywords:depthtreatmentnonthermalequilibriumplasmacyanide-containingwastewatertwo-phasemixturedischarge2005______20052005111.11.21.2.1[1]50LD50mg/kgmg/kg11505050050050005000150001500020.05mg/LFe,Fe1.2.231.2.3[2,3]4[3]5[2,4][3,5]6pH[6,7][8][2][3]7pHpH89[9][10][11]pH10[12][13][14][15]11[16,17[18][5]9012131.31.4pH1422.112115EBEBaq-HOH,;X,,,EBEB,[19]EBaq-HOH[20]aq-HOH,[21],[22]EB,,[23],2,,,J.SClements[24]1987StreamerDischargeSparkDischarge,16Willberg[25,26]O3TNT[27,28]TNT3[29][30][31]O3S.Boev[32]90%0.05kWh/m34333417e-aq[35,36][37][38]-5sA.Abou-Ghazala[39]pHKatsuki.S[40]nsJayaram[41](THMs)ns2.218[4243]12-1(2-2)21932-4[44]42-552.3H2O202-8[45][46][47]2-92-62-721[48][49][50]2.42.4.12-102-112-12EHD22232.4.22425262.4.327282930pH3133.13.23.2.13.2.232[2526](εe)80(εi)1pH/scmm,Y/kVcm3.2.3[51]33pHPH/ISE828pH3.33.3.1pHpHT()pHT()pH34pHT()pHT()pH35pHT()pHT()pH36pHT()pHT()pH3-5(%)pH=9.04pH=10.03pH=11.08pH=12.00min3010.6032.2828.921.969.8612.118.357.756020.0950.0816.2643.836.1116.628.3515.909014.2066.1462.0029.743.8735.0710.1118.0112024.5481.0436.6875.9010.5446.257.7519.94373-6(%)pH=8.02pH=9.04pH=10.09pH=11.05pH=12.0min3035.1454.7825.1637.1020.4737.1405.961.0911.126036.3261.8934.1257.6032.6157.61022.215.6115.069051.2379.6445.2674.7256.5272.8316.0237.895.4221.1612058.8186.7453.8281.8947.2881.1617.1859.563.4525.49(%)pH=7.96pH=9.00pH=10.02pH=11.08pH=12.0min3030.1837.2833.3440.3526.7544.4500.475.8914.466057.2569.2456.9863.9852.6765.955.7633.5310.3812.419065.9183.4468.7982.5863.8485.1233.9765.718.7526.4812082.5593.4378.4295.0578.8066.1653.8084.007.1232.19(%)pH=9.09pH=10.04pH=11.61pH=12.09min3027.1039.717.0025.603.672.206037.1056.6024.0053.203.677.005.009047.2080.5047.3078.7016.4022.002.306.6012057.3092.6052.4093.2022.0045.0038pH2pH=9.09pH=10.08pH=11.08pH=12.0172.3584.2858.8085.6051.9257.3325.3110.24pH=9.04pH=10.03pH=11.08pH=12.00235.7157.8269.3768.3342.4188.47.6412.1928.9414.1952.6525.0619.619.321.520.95pH=8.02pH=9.04pH=10.09pH=11.05pH=12.069.8897.3679.2689.9187.3656.0466.81993.017.060.6157.2664.9148.3970.9026.4939.7916.740.770.59pH=7.96pH=9.00pH=10.02pH=11.08pH=12.082.7386.1779.3478.6282.6279.8279.7992.350.746.4177.2971.1375.4161.6570.3362.9067.0249.680.240.46393.3.2pHpHpHpHpHpH[24]pHpHpHpH[HCN][CN][HCN]+[HCN][CN]pHpHpHpHpH40pHpHpHpHpHpHpHpHpHpHpHpHpHpHpHpHpH41pH3-5(a)pH=8(d)pH11423-6pH(b)pH=1043pHpHpHpHpH44pHpHpHpHpHpHpH263110.03210(2410)9.21622CUQ-×=××××=9.216218.4fPQ××=318.410kW-×330.67/kWhmQPCU24kVf2Hz12045[37]34525346pH3.4pHpHpHpHpHpHpH474160mLpH4.14-160mm4.28mm4.34.3.1pH48pHT()pHT()pHpHT()pHT()pH49pHT()pHT()pH4-418kVpHT()pHT()pH4-518kVpHT()pHT()pH504-18kVpHT()pHT()pH4-718kVpH(%)minpH9.04pH10.01pH10.99pH12.043043.1815.9827.2733.036059.0441.3034.9013.459062.1849.5345.1349.8012059.0443.6748.1052.184-818kVpH(%)minpH8.01pH9.02pH10.03pH11.00pH12.083067.4964.9864.7628.618.486074.8586.1379.1046.6415.749074.0797.2594.2663.6825.9312075.4395.5097.5972.3940.06514-918kVpH(%)minpH7.94pH9.00pH10.07pH11.00pH12.043044.6346.3017.9814.203