環(huán)境工程專業(yè)英語(yǔ)

環(huán)境工程專業(yè)英語(yǔ)第1頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月Abstract：Ananaerobichydrogenfermentationsystemwithathermophilicflow-throughreactor(55oC)forhydrogenproductionandaboilingretentionvessel(100oC)forcontinuousheattreatment,wasstudiedforenhancedcontinuoushydrogenfermentationusingsewagesludge.TheperformanceofthehydrogenfermentationsystemwastestedatvariousHydraulicRetentionTimes(HRTs)rangedfrom1to5days.Theheattreatmentofthefermentingsludgeusingtheboilingretentionvesselwasaneffectivetoselecthydrogenproducingbacteria,andtoincreasethehydrolysisofparticulateorganicsinsewagesludge。

第2頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月Introduction

Commercialhydrogenisalmostproducedfromsteamreformingofnaturalgasesandgasificationofcoal,buttheserequirehigh-energyinputsobtainedfromnon-renewableresources.Withbothadvantagesofhydrogenproductionandstabilizationoforganicwaste,theanaerobicfermentationisrelativelyanefficientandinexpensivemethodcomparedtothephysicochemicalmethodsforhydrogenproduction.Theobjectiveofthestudyistodevelopacontinuousanaerobichydrogenfermentationsystemwithstablehydrogenproductionbyheattreatment,andwithhighyieldofhydrogenbyadoptingthermophiliccondition.

第3頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月MaterialsandMethods

ExperimentalApparatus

GassamplingpotActivatingreactorBiogasSludgetankInsutationHeatingCoilThermophilicfermenterEfluent第4頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月AnalysisandCalculations

Biogasproductionwasmonitoreddaily,anditscompositionwasanalyzedbyagaschromatographequippedwithathermalconductivitydetectorToanalyzethemethaneandcarbondioxideinthebiogas.withaflowrateof40mL/min,andthetemperaturesoftheinjector,detector,andcolumnwere80,90,and50oC,respectively.Thevolatilefattyacidlevelsandtheircompositionswereanalyzedbyhigh-performanceliquidchromatography.Themixedliquorswereintermittentlytaken

fromboththeflow-throughandtheretentionreactor,andthe

properties,includingpH,alkalinity,COD,VSS,VS,andTS,of

thesampleswerealsoanalyzedaccordingtotheStandard

Methods.ThehydrolysisrateandVFAproductionratewerecalculatedbyEqs.(1)and(2)respectively.

[(massSCOD/d)effluent?(massSCOD/d)influent]/

[(massPCOD/d)influent?(massPCOD/d)effluent](1)

[(massVFA/d)effluen?(massVFA/d)influent]/

[(massSCOD/d)effluen?(massSCOD/d)influent](2)

第5頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月HydrogenProduction

HydrolysisandVSReduction

VFAProductionandHydrogenYield

ResultsandDiscussion第6頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月HydrogenProduction

第7頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月

HydrogenProduction第8頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月

HydrogenProduction

thehydrogenproductionratewasquicklyincreasedandapproachedtosteadystatewithinthe10thdayoftheoperationat1dayHRT

theexposureofthefermentingsludgetoheatisagoodapproachforboththeselectionofhydrogenproductionbacteriaandtheenhancementofhydrolysisrateofparticulateorganicmatter.However,aproperHRTisalsoveryimportanttoobtainhigherhydrogenproduction.Inthestudy,theproperHRTwas3days,andthehydrogenproductionwaslimitedbythehydrolysisratefor1dayHRTandbythehydrogenconsumptionactivityfor5daysHRT.

第9頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月HydrolysisandVSReduction

Thehydrolysisintheanaerobicdegradationfororganicsludgecontainingparticulatematterisusuallyaratelimitingstep,affectingonthewholeperformanceofanaerobicprocess,anddeterminingVS(VolatileSolids)removalofthesludge.VSremovalandhydrolysisrateweresignificantlyaffectedbypHconditionInthecaseofRunIIIwith5daysHRT,VSremovalwas37.9%,whichwashigherthanRunIorRunII.TheeffectoftheexposuretimeofthefermentingsludgetoheatwasconfirmedagainbytheincreaseofVSremovalinRunIIIwithlongerHRT.

第10頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月HRTintheanaerobichydrogenfermentationsystemwithcontinuousheattreatmentisanimportantparameterinselectinghydrogenproducingbacteriaanddeterminingthepathwaysforminghydrogen.pHisanotherimportantparameterdeterminingthemetabolicpathwayforminghydrogen

VFAProductionandHydrogenYield第11頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月highermaximumyieldofhydrogencomparedtopreviousstudieswas3.07mmolH2/gTS,whichwasobtainedat3daysHRT.ThehydrogenyieldandhydrolysisrateweresignificantlyaffectedbypHcondition,andproperpHforthehydrogenfermentationwasfrom5.5to6.5.Thehydrogenproductionwaslimitedbythehydrolysisfor1dayHRTandbythehydrogenconsumptionactivityfor5daysHRT

第12頁(yè)，課件共13頁(yè)，創(chuàng)作于2023年2月Conclusion

Thecontinuoushydrogenfermentationsystem,consistedofa

thermophilic(55℃)flowthroughreactorandaboilingretention

vessel(100℃)forcontinuousheattreatmentwasagoodprocess

forcontinuoushydrogenproductionfromsewagesludge.The

continuousheattreatmentofthefermentingsludgeusingthe

boilingretentionvesselwasaneffectivemethodfortheselection

ofhydrogenproducingbacteria,andtheincreaseofVSremoval

invirtueoftheenhancementofhydrolysisforparticulateorganics

insewagesludge.Theperformanceofhydrogenfermentation

wassignificantlyaffectedbythehydraulicretentiontimeand

pH,andtheoptimalconditi