粉碎预处理对秸秆沼气发酵浮渣形成的影响分析

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1、万方数据AbstractCellulosefeedstockincludingcropstraw,lowindensityandhardtodecompose，mayfloatandcrustonbiogasslurry,andlimititsutilizationefficiencyinbiogasproduction．Thisarticleemploystheexistingfermentationprocessofstrawbiogasprojectandusesthestrawofthreemajorc

2、ropsinChinasuchasrice，wheatandmaizeasfeedstock．Bymechanicalpretreatmentmethod,strawiscutinto5cmand2cmandthesizethrough10meshscreenformesophilicbatchbiogasfermentationexperimentina22LdigestermadeofPlexiglas(Fermentationtemperature：35+1℃，TSconcentration：4．2％，H

3、RT：60d)．Thepurposesoftheresearchincludetheresearchonbiogasproductionperformance，physicalpropertyandcrustbreakingstrength,andanalysisonenergyconsumptionforcrustbreakinginstrawbiogasproject，soastofindthemaximalgranularityofthethreekindsofcropsfortheenhancement

4、ofprojectoperationefficiency．Themainconclusionsofthetestareasfollows．(1)Intermsofbiogasproductionperformance，theexperimentonthethreekindsofstrawofdifferentgrainsizeseachshowedthatthesmallerthesize，thehigherthebiogasproduction．Forthesizesof5cm，2cmandthesizeth

5、rough10meshscreen，biogasyieldofricestrawwere382．42ml／gTS，413．34ml／gTSand483．35ml／gTS，andtheaveragemethanecontentwere2．68％，53．45％and54．88％respectively；biogasyieldofwheatstrawwere377．25ml／gTS，398．14ml／gTSand431．04ml／gTS，andtheaveragemethanecontentwere58．00％，58

6、．10％and59．53％respectively；biogasyieldofcornstrawwere416．28ml／gTS，509．53ml／gTSand529．10ml／gTS，andtheaveragemethanecontentwere58．40％，58．34％and58．42％respectively．(2)Intermsofcrustlayerfeatures，thesmallerthegranularityofthestraw,thehigherthedensityofthecrustwhil

7、ethesmallerthethicknessinthecrustlayerandthefiltrationlayer,andconsequentlythesmallerthebreakingstrengthwouldbe．Forthesizeof5cm，2cmandthesizethrough10meshscreen，theultimadensityofricestrawcrustlayerwere54．849／L，62．679／Land99．719／L，whileitsultimathicknesswere

8、20cm，17．5cmand1lcm，andthefiltrationlayerinthecrustwere10cm，6cmand1cm．thenconsequently,thecrustbreakingstrengthwere3．14kPa,2．IOkPaand1．24kParespectively；theultimadensityofwheatstrawcrustlayerwere