不同预处理方式对玉米秸秆产气效果的影响

1001－4829201405－2187－082013－12－08“”2011BAD15B032010BAD03B01“”[e-mail]*。李平，蒋滔*，李萍，刘科，韦秀丽401329NaOH。0．4%NaOH7dpHCODcr。NaOH。pHCODcr。“”CH460%。0．4%NaOH225．8mL/gNaOH。NaOHS39AEffectsofDifferentPretreatmentMethodsonAnaerobicDigestionofCornStrawforBiogasProductionLIPingJIANGTao*LIPingLIUKeWEIXiu-liInstituteofAgriculturalEngineeringChongqingAcademyofAgriculturalSciencesChongqing401329ChinaAbstractTakencornstrawastestedmaterialsthebiogasslurryanddifferentconcentrationsofNaOHpretreatmentonanaerobicdigestionofcornstrawforbiogasproductionwereinvestigated．Theresultsshowedthatunderthe0．4%NaOHconcentrationpHandCODcrinthepre-treatmentsolutionwasbasicallystableafter7dayswhichwasverysuitableforfermentation．TheresultsofScanningelectronmicroscopySEMobservationalsoprovedthattheNaOHconcentrationentirelymeetpretreatmentrequirement．Anaerobicfermentationresultsindica-tedthatpHfirstlydecreasedandthenincreasedafteracidproductionstagebutCODcrwasopposite．Thedailygasproductionofcornstrawpresentedtwosinglepeakthevalueoffirstpeakwashigherthanthatofthesecondbutthelattercontainedmoremethanemorethan60%．Thepretreatmentwith0．4%NaOHconcentrationhadthesimilargasproductionyieldwithotherstudieswhichwas225．8mL/gdrymaterial．HowevertheNaOHconsumedinthisstudywaslessandverybenefitforthepromotionofyieldwithlow-price．KeywordsCornstrawNaOHpretreatmentAnaerobicfermentationGasproduction7t30%1、2。3。。、、4～5。、6～7。58～9NaOH、。NaOH78122014275Vol.27No.5SouthwestChinaJournalofAgriculturalSciencesDOI:10.16213/j.cnki.scjas.2014.05.0151Table1Mainphy-chemicalindicatorsofcornstraw%TS%VS%C%N%11．2888．7282．6247．120．46114%74%510700%9。。、pH、。、、。11．13～5cm55℃6h1。1．220g200mL4NaOH2%、1%、0．6%、0．4%2NaOH2。25℃。8d500mL120mL5%400mLpHpH7。35℃。3d1pH、TN、NH+4-N、VFACODcr2d120d。1．3pHpHIQ1507．0010．00pH。CODcrNH+4-NTN－VFA。TescanVegaⅡLMU400CH4CO2GA2000plus100mL。22．12．1．1pHOH－、59。pH1。pH。0．4%、0．6%、1%NaOH0．4%NaOH8dpH0．4%NaOH12．997．740．6%、2Table2ExperimentaldesignofstrawpretreatmentgmLNaOHgNaOH%202000020200000．4%202000．80．40．4%NaOH+202000．80．40．6%202001．20．61．0%202002．01．02．0%202004．02．08812271413121110987pH700006000050000400003000020000100000COD（mg·L-1）0123456789时间（d）12345678时间（d）空白0.4%沼液沼液0.6%碱液0.4%碱液1%碱液2%碱液空白0.4%沼液沼液0.6%碱液0.4%碱液1%碱液2%碱液1pHCODFig．1ThepHandCODdiurnalvariationofcornstraw-liquidafterdifferentpretreatment1%NaOHNaOH0．4%8dpH8．69、11．368．902%NaOHpH13．513pH。2．1．2CODcrNaOH、92Fig．2Field-emissionscanningelectronmicrographsofcornstalksafterdifferentpretreatments98125CODcr。CODcr1。8dCODcr。CODcr0mg/L4680mg/L1870mg/L7150mg/LCODcr600mg/L。0．4%NaOH0．4%NaOHCODcr27300、25200mg/L2%NaOHCODcr62800mg/L。5dCODcr8d85%CODcr。2．1．3秸秆结构的变化a、0．4%NaOHb、0．4%1%NaOHc、d2。、11。。0．4%NaOH、0．4%NaOH。1%NaOH。2．22．2．1pHpHpH6．8～8．0。3pH。1%43～5dpH。pH7d1%NaOHpH11NaOHpH6．8313dpH。5pH6．8～7．5。2%NaOHpH。2．2．2CODcrCODcrCODcr3。、3～5dCODcr5～10dCODcr8.28.07.87.67.47.27.06.86.66.46.26.05.8pH空白沼液0.4%沼液0.6%碱液0.4%碱液1%碱液0510152025303540发酵天数（d）0510152025303540发酵天数（d）24000220002000018000160001400012000100008000600040002000COD(mg·L-1)空白沼液0.4%沼液0.6%碱液0.4%碱液1%碱液3pHCODFig．3ThepHandCODdiurnalvariationincornstrawfermentation0912277006005004003002001000发酵前发酵后发酵前发酵后发酵前发酵后1200110010009008007006005004003002001000120001000080006000400020000NH4鄄N浓度（mg·L-1）TN浓度（mg·L-1）VFA浓度（mg·L-1）秸秆0.4%沼液0.4%碱液0.5%碱液1%碱液沼液秸秆0.4%沼液0.4%碱液0.6%碱液1%碱液沼液秸秆0.4%沼液0.4%碱液0.6%碱液1%碱液沼液+4Fig．4DiurnalvariationofotherindicatorsincornstrawfermentationNaOHCODcr。CODcrNaOHCODcr。2．2．3其它指标NH+4-N412。NH+4-NTN12VFA。2．2．4产气量及甲烷含量5“”CH4。1%NaOH5～10dNaOH。0．4%5210～240mLCH420．7%36．3%。0．4%5240mLCH424．8%0．6%10CH4274mL、24．8%。pHCODcrCO2。10dCH40．4%110mL0．4%0．6%18。20dCH460%。25d0．4%3779mL、0．4%3759mL。30dNaOH0．4%4007mL、0．6%4048mL。1623735mL1%11pH172235d4834mL。“”19125120100806040200产气量CH4CO2产气量CH4CO2产气量CH4CO2产气量CH4CO2产气量CH4CO2产气量CH4CO2807060504030201000510152025发酵天数（d）0510152025发酵天数（d）0510152025发酵天数（d）05101520253035发酵天数（d）051015202530发酵天数（d）051015202530发酵天数（d）30025020015010050080706050403020100气体含量（%）气体含量（%）日产气量（mL）300250200150100500日产气量（mL）300250200150100500日产气量（mL）80706050403020100气体含量（%）80706050403020100气体含量（%）80706050403020100气体含量（%）80706050403020100气体含量（%）300250200150100500日产气量（mL）260240220200180160140120100806040200日产气量（mL）空白沼液0.4%碱液0.6%碱液1.0%碱液沼液日产气量（mL）5Fig．5Thetrendofdailygasproductionandmethaneandcarbondioxidecontent、91314。2．5NaOH22NaOH5%2d1d2pH。5%NaOH2．5%H2O220NaOH80℃、5min21-NaOH22。。、、10。、2912272Table2ComparisonsofpretreatmentmethodwithdomesticotherresearchStrawtypesNaOHConcentrationofNaOHpHAdjustpH℃PretreatmenttemperaturePretreatmenttimeSolid-liquidratioＲeferences11d1∶20152～8g/g－803h－102～8g/g2030d－952d1∶2166～10－80～1201～3d－17、21d1∶20182．5～7．5－203d1∶8190．98070min1∶2055－1～5d1∶5～1∶30200．4－502d1∶20210．4257d1∶103Table3ComparisonsoffermentationresultswithotherstudiesStrawtypesPretreatmentC/NAdjustpH℃FermentationtemperaturemL/gGasproductionrateＲeferences6%NaOH38246．696%NaOH－200．01035190．01335191．01435219．31438173．52335227．31435167．60．4%NaOH35225．81%NaOH35272．4NO－3-NNH+4-N16。19。pH6．7～7．4。3。0．4%NaOH、。31、NaOH19∶0．8∶2007dCODcr、pH。0．4%NaOH、。2pH3～5dCODcr。NH+4-N、TNVFA。339125“