曝气管开孔直径对一体式膜_生物反应器的影响_魏春海

中国环境科学2007,27(2)：169~173ChinaEnvironmentalScience曝气管开孔直径对一体式膜-生物反应器的影响魏春海,汪诚文,黄霞*(清华大学环境科学与工程系,环境模拟与污染控制国家重点联合实验室,北京100084)摘要：在中试水平上考察了3种不同开孔直径的穿孔曝气管(A:φ4mm,B:φ2mm,C:φ1mm)对一体式膜-生物反应器整体性能的影响.清水充氧性能试验表明,3种穿孔管条件下的反应器整体充氧性能基本一致;流态特性分析显示,3种穿孔管条件下的反应器流态均近似完全混合流.水动力学特性试验发现,升流区液体表观流速随着升流区曝气强度的增大呈现先上升后趋于稳定的现象,低曝气强度[<120m3/(m2⋅h)]时穿孔管A条件下的升流区液体表观流速最高,高曝气强度[>120m3/(m2⋅h)]时3种穿孔管条件下的升流区液体表观流速趋于一致(稳定值约为0.43m/s),恒通量膜过滤试验表明,穿孔管A条件下的跨膜压差上升速率(0.0382kPa/h)低于穿孔管C(0.05kPa/h).对本中试装置来说,开孔直径较大的穿孔管A的综合性能优于开孔直径较小的穿孔管B和C.关键词：穿孔曝气管；一体式膜-生物反应器；充氧性能；流态；表观流速；膜污染中图分类号：X703文献标识码：A文章编号：1000-6923(2007)02-0169-05Effectoftheorificediameterofperforatedpipeonasubmergedmembranebioreactor.WEIChun-hai,WANGCheng-wen,HUANGXia*(StateKeyJointLaboratoryofEnvironmentalSimulationandPollutionControl,DepartmentofEnvironmentalScienceandEngineering,TsinghuaUniversity,Beijing100084,China).ChinaEnvironmentalScience,2007,27(2)：169~173Abstract：Effectofthreeperforatedpipeswithdifferentorificediameter(A:φ4mm,B:φ2mm,C:φ1mm)ontheperformanceofapilot-scalesubmergedmembranebioreactor(SMBR)wasinvestigated.OxygenationtestwithtapwatershowedthattheoveralloxygentransferperformanceoftheSMBRwiththreeperforatedpipeswasnearlythesame.TracerpulsetestindicatedthattheSMBRwiththreeperforatedpipeswasclosetocontinuousstirredtankreactor.Hydrodynamictestshowedthatsuperficialvelocityintheriserrosefirstlyandthenreachedasteadyvalueabout0.43m/swithaerationintensityintheriser;whenaerationintensitywaslow[<120m3/(m2⋅h)],superficialvelocitywashigherunderperforatedpipeA;butwhenaerationintensitywashigh[>120m3/(m2⋅h)],thedifferenceofsuperficialvelocityamongthreeperforatedpipesbecamesmall.FiltrationtestunderconstantfluxindicatedthattransmembranepressurerisingvelocitywithperforatedpipeA(0.0382kPa/h)waslowerthanwithperforatedpipeC(0.05kPa/h).PerforatedpipeAwithbiggerorificediameterwassuperiortoperforatedpipeBandCwithsmallerorificediameterinthispilot-scaleSMBR.Keywords：perforatedpipe；submergedmembranebioreactor；oxygentransferperformance；flowpattern；superficialv