电解脱氮除磷工艺在规模化养猪废水处理中的应用研究

上海交通大学硕士学位论文电解脱氮除磷工艺在规模化养猪废水处理中的应用研究姓名：尚晓申请学位级别：硕士专业：环境工程指导教师：孔海南20090101I1.pH5-9311.0L/(min•L)//2.pH101213.98%18%4.136min42.4%83.7%IIResearchontechnologyofelectrolysisforNandPremovalapplyingonintensiveswinewastewaterABSTRACTWithencouragementtoenlargelivestockyieldinginmostcountryside,ourcountry’slivestockindustrydevelopedwellandrecentlybecomemoreindustrial,moreintensiveandmoreregional.Forhogindustry,duetotheamountandconcentrationofwastewaterthatdischargefromintensivepigfarmisverybigandhigh,swinewastewaterisalwaysoneofmainpollutionsourcesinmostdistrictsandwatershedsandcausesevereenvironmentalpollutionandmuchdrainageofvaluableNandPresourceeveryyear.ThisdissertationintensivelyresearchonthetechnologyofelectrolysisforNandPremovalofswinewastewaterfromintensivepigfarm,whichcanovercomethebottleneckoftraditionaltreatmentthathasalessefficiencyonremovalofhighconcentrationofNandPinwastewater,andwithsimpleapparatus,easymaintenance,shortHRTandhighremovaleffects.Theresearchresultsshowthat:1.ForPremovalelectrolysis,theoptimalparametersincludepHrangewasfrom5to9,[Fe]:[P]=3:1andaerationvolumewas1L/minfor1Lwastewater.Alsofoundthataerationhadfunctionsofimprovingelectrodepassivationandloweringenergyconsumption,andFe/FeandFe/Graphitewerelessindifferent.2.ForNremovalelectrolysis,itadaptedwidepHrange,butneutralconditionwaspreferred,andoptimalinitialconcentrationofcl-andcurrentdensitywerecorrespondedbytheoreticalvalueofc[cl-]:c[NH3-N]=10:1and[HClO/ClO-]:[NH3-N]=2:1respectively,inadditionduringthatprocessaerationhadnoanyeffectsofNH3-Nblowoff.3.Artificialwastewaterexperimentjustifiedthefeasibilityoftheelectrolysistechnology,whichrealizedtheswitchbetweenNandPremovalelectrolysiswithoutanyreagentduringtheprocess.ECandtemperatureparameterschangedsmoothlyandelectrodepassivationhadnoteverhappened.Asforpollutionsremoval,98%ofthetargetpollutionPhadbeenremoved,howeverasnogoodbalancebetweenacidandalkalinity,thetimeofNremovalelectrolysiswassoshortthateffluentqualityofNH3-Ncouldnotmeetthedischargestandard.4.Realwastewaterexperimenttookupabout136mininall.TheorganicpollutionscanmakeupthealkalinityofwatersothatextendedNremovalelectrolysistimeandimprovedtheremovalrateofTOCandNH3-Ntoreach42.4%and83.7%respectively.TOCmainlywasremovedbyelectrochemicaloxidationduringNremovalphase,butforsomeunclearlyreasonsPremovalhappenedinfirstNremovalandPremovalphases,soPremovaltimeisreducedmuch.AerationcouldcontributetoTOCremovalbuthadlessefficiencyonPandNremoval,sothereisnosuggestiontoaddaerationconditionwheneffluentqualityofTOCcouldmeetdischargestandard.KeywordsIntensivepigfarm,swinewastewater,NandPremoval,electrolysisI1.1200529.3%44.5%198018%200637%[1]199420044.154.8216.23%4.216.1846.78%1-11999-20041-11999-2004[2]Fig.1FastgrowthprocessofintensivepigfarmsinChinafrom1999to20041-1[3]2000-200520052000[4]220011.58CODcrCODcr3.222002147650m8%-10%5834150m25%-40%[5]1-12000-2005Tab.1-1CalculationoflivestockpollutionsinChinafrom2000to2005BOD5CODcrNH3-NTPTN2000227798.044244.265050.82490.64271.961181.4711239.152001228596.574240.005044.88489.31271.011179.0711224.262002234628.304345.895170.40502.14279.161210.6511508.242003242270.534470.185321.74517.80288.331249.7611847.812004250118.644590.805465.53531.77296.551284.8912169.542005257533.244691.625638.22548.12306.201323.5712507.731.21-2[6]CODNP5020152000310%60%80%[5]60%[6]CODBOD337%[7]20056t[8]COD65%75%84%57%21%62%1-2Tab.1-2QualityofwastewaterdischargedbyintensivepigfarmsinChinaCODcr(mg/L)NH3-N(mg/L)N(mg/L)P(mg/L)264026137043.521600590080501270*2002231.31.3.190%70[9]101999[10]4450m3/ha3240kg/ha3-93-9189-15300-90045018670.4hm22006NY/T1168-20061-20.40.41-2[11]Fig.1-2AlertnessindexchartofsoilpollutionloadinChina7-851.3.21-3Fig.1-3Flowdiagramofnaturaltreatmentoflivestockwastewater11030d69%75%[12]4[13]BODBOD0.61.5-10001236250t200d[14]100m3/dUASB/SBR/24hCOD93.7%92.4%96.4%GB18596-2001[15]2M.E.Poach611m40mCOD61%TSS63%70%[16]Reddy51%37%30%45%[17]681351300BOD565%TSS53%NH3-N48%TN42%TP2%[18]BOD588%COD86.7%SS90.8%[19]COD70.5%NH3-N76.5%TP48.8%[20]1.3.371-41-4Fig.1-4Flowdiagramof“ThreeSteps”treatmentofswinewastewaterATP50%NgWunJernSBR68.7%[21]SuSBRCOD58.3%NH3-N13.3%PO4-P38.7%[22]COD500mg/LNH3-N200mg/LTP100mg/L[23]SBR60%600mg/L[24]NolwennPradoMBR---COD85%99%79%[25]8MAPSuzuki[26]P.W.AntonPereraMAPpH=9NH4+:Mg2+:PO43-=11.51.570%97%[27]UASB/SBR/CODNH3-NTP91.7%89.4%31.1%1.492.11889190419091946[28][29][30][31]TDS[32][33]3mg/LSahsetIrdemez[34]100mg/LpHNihalBektas[35]1070ThomasA.Pressley[36]pH[37]COD[38]YvesVanlangendonck[39]M.Ikematsu[40][41]112.2pHOH-2-1Fig.2-2SchematicdiagramofelectrolysisforPremoval[42]COD22422222(5)(6)23(7)clHOHClOHCLNHHClONHClHOHNHClHClONHClHO+++=+−−−−−−−+=++−−+=++−−2-2Fig.2-2SchematicdiagramofelectrolysisforNremoval12pH2-3Fig.2-3Schematicdiagramofcombinedelectrolysistechnology132.32-4Fig.2-4Technologyroadmapofthesubject1.2.pH1pH2pHpH1434//53.1pH23152.42.2.12-51LpH2-12-5Fig.2-5Sketchmapofelectrolysisequipment2-1Tab.2-1Chartofmainexperimentalequipments8cm5cm/HTP-5010KpHPHS-3CDDST-308A79-1PVC20cm10cm8cm1L0-5L/minResun162.2.21LKH2PO4NH