不同pH值下初沉污泥与二沉污泥厌氧发酵对比李晓玲

pH12111．7100642．100124pH。pH5～1214d。SCOD、VFAs、、、。SCODVFAsSCODpH=9、=9．5dpH=10、=7．5dVFAspH=10SCOD671．9mgSCOD/gVSS501．6mgSCOD/gVSS、52．8mgNH+4－N/gVSS、13．2mgPO3－4－P/gVSS21．8mgNH+4－N/gVSS、3．6mgPO3－4－P/gVSS。、pH=10、=8d。pHX703A1000－4602201603－0015－07310829151074ComparativeStudyonPrimarySludgeandSecondarySludgeinAnaerobicFermentationatDifferentpHValuesLIXiao-ling1PENGYong-zhen2HANBo-tao1ZHAOJian-qiang11．KeyLaboratoryofWaterSupplyandDrainage＜MinistryofHousingandUrban-RuralDevelopment＞Chang’anUniversityXi’an710064China2．KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineeringEngineeringResearchCenterofBeijingforNitrogenandPhosphorusRemovalandProcessControlBeijingUniversityofTechnologyBeijing100124ChinaAbstractpHvalueandfermentationtimearetwoimportantfactorsinthefermentationprocessofsludge．SequencingbatchmethodwasusedtoexaminethefermentationprocessesofprimarysludgeandsecondarysludgeatpHvalueof5to12andthefermentationtimeof14days．ThedissolutionprocessesandthedissolutionratesoffermentationproductsofthetwodifferentkindsofsludgewerecomparedintermsofSCODVFAsproteincarbohydratenitrogenandphosphorus．Theresultsshowedthatalkaline·1·32320162CHINAWATER＆WASTEWATERVol．32No．3Feb．2016conditionswereobviouslybeneficialtothedissolutionofSCODandVFAsSCODdissolvedrapidlyintheinitialstageandtheoptimumfermentationconditionsofprimarysludgewerepHof9andfermentationtimeof9．5dayswhilethoseofsecondarysludgewerepHvalueof10andthefermentationtimeof7．5days．PrimarysludgecouldproducealargenumberofVFAsinarelativelyshorttimethereforefermen-tationofsoleprimarysludgewasconsideredtobethemosteffectiveandrapidmethodtoobtaintheinter-nalcarbonsource．ThoughtheamountofSCODdissolvedbysecondarysludge671．9mgSCOD/gVSSwasmuchhigherthanthatbyprimarysludge501．6mgSCOD/gVSSatpHvalueof10afterstabiliza-tionthereleaseratesofnitrogenandphosphorusfromsecondarysludge52．8mgNH+4－N/gVSSand13．2mgPO3－4－P/gVSSwerealsohigherthanthosefromprimarysludge21．8mgNH+4－N/gVSSand3．6mgPO3－4－P/gVSS．Besidesalargeamountofnitrogenandphosphorusreleasedbysecondarysludgeseriouslyaggravatedthetreatmentloadofthefollow-upsystemthereforeinordertoeasethisim-pactandcombinedwiththerespectivefermentationcharacteristicsofthetwokindsofsludgeitwassug-gestedthatfermentationofmixedsludgewasusedtoobtaintheinternalcarbonsourcesundertheoptimumconditionsofpHvalueof10andfermentationtimeof8days．KeywordsalkalinesludgefermentationmixedsludgefermentationtimepHvaluedissolutionratefromfermentationC/N。①、、、②、“”③BNR。。1、2、3～5、6YuanWu34pHSCODVFAs、。pH。11.11。1Tab．1SludgepropertiespH5．876．75TSS/mg·L－1542035050VSS/mg·L－1346903550VSS/TSS0．640．70SCOD/mg·L－1116549/mg·L－145．064．38/mg·L－1416．0518．49NH+4－N/mg·L－197．597．16PO3－4－P/mg·L－122．033．41、、NH+4－N、PO3－4－P。1.2pH51#、62#、73#、84#、95#、106#、117#、128#pH9500mL100r/min25℃。100mL0．9mol/LH2SO4·2·323．watergasheat．com1。1Fig．1SchematicdiagramofexperimentsetuppH2mol/LNaOHHCl12hpH±0．324h6000r/minSCOD、、、、8000r/minVFAs。1.3COD、NH+4－N、PO3－4－P、MLSS、MLVSSLowrypH。VFAs7890H2250℃1∶170℃0min25℃/min170℃2minFID300℃45mL/min450mL/min。22.1pHSCOD7。、、95%～97%99%。2pHSCOD。SCODYuan4。pHpHpHSCOD。Chen8SCODSCOD。2pHSCODFig．2SCODyieldsinfermentationofprimarysludgeandsecondarysludgeatdifferentpHs2d4dEPS。pHSCODSCOD·3·．watergasheat．compH323SCODCai。3SCOD。pHpHSCODSCOD。SCODSCODpH=10、11、12、5pH=6、7、8、9SCODSCOD。3SCODFig．3ComparisonofSCODdissolutionratebetweenprimaryandsecondarysludge2.2、、EPS4。EPS。pH4。Tanaka41%、25%、14%20%。4pHFig．4DissolutionratesofcarbohydrateandproteininfermentationofprimarysludgeandsecondarysludgeatdifferentpHs2.3pHVFAs。、、、VFAsNH3、CO2、H2SVFAs、CO2H2。VFAs。Tong9VFAsPantelis10VFAs、、、。5pHVFAsCOD1．071．51·4·323．watergasheat．com1．822．04。5pHVFAsFig．5VFAsyieldsinfermentationofprimarysludgeandsecondarysludgeatdifferentpHvalues5apH89VFAs9．5d。5bpH910VFAs7．5dVFAs。VFAsVFAsSCODSCODVFAs。VFAsVFAs。Miron25℃8d。VFAs。VFAs。SRTHRTVFAs。2.4pHSCODSCOD、、VFAspH9、107．5、9．5dSCOD。VFAs40%～50%20%～25%3%～5%VFAs25%～30%5%～10%。6SCODFig．6SCODcomponentsinfermentationofprimarysludgeandsecondarysludge2.5、BNR、·5·．watergasheat．compH323。pH、SCOD2。A2O、。2、Tab．2AmmoniaandphosphorusreleaseinfermentationprimarysludgeandsecondarysludgepH=5pH=6pH=7pH=8pH=9pH=10pH=11pH=12NH+4/VSS16．217．019．521．923．924．522．014．88．3PO3－4/VSS2．32．52．33．02．43．03．64．33．2SCOD/N13．89．29．47．313．719．828．852．3124．3SCOD/P166．6108．3137．991．2231．3281．5302．4310．8548．3NH+4/VSS23．157．041．09．337．747．749．346．79．3PO3－4/VSS10．113．011．48．37．511．310．911．87．4SCOD/N2．53．22．67．62．88．214．524．3147．8SCOD/P9．824．115．914．624．559．1112．8164．3319．2pH、pH、NH+4－NNH+4+H2O→NH3+H+NH+4NH3pH10、11、12Mg2+、Ca2+pH12。COD/NCOD/PBNRCOD/N4COD/P8～15。2pHSCOD/NBNR。2.6①pH12＞11＞10＞9＞8＞pH。②SCOD2d4d6、、、4dVFAs7．5～9．5d7．5dSRTVFAs。。SCODVFAs、11SCOD。Su12。pH=10、SRT=8d、。3①SCODVFAsSCODSRT=2dSRT=4dSRTVFAsSRT=7．5～9．5dVFAsSRT=7．5dSCODVFAspH=9、SRT=9．5dpH=10、SRT=7．5d。②·6·323．watergasheat．comSCODVFAs、。③SCOD25．4%、58．7%73．1%pH=10、SRT=8d。1LiuYLLiXKangXRetal．Shortchainfattyacidsaccumulationandmicrobialcommunitysuccessionduringultrasonic-pretreatedsludgeanaerobicfermentationprocessEffectofalkalineadjustmentJ．IntBiodeteri-orBiodeg