a-10万吨糖蜜酒精生产线高浓度有机废水处理项目设计方案

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青岛国桥进出口有限公司QingdaoChinaBridgeImport&ExportCo.,Ltd.110万吨糖蜜酒精生产线高浓度有机废水处理项目100,000Tmolassesalcoholproductlinehighconcentratedorganicwastewatertreatmentproject工艺技术方案ProcessTechnicalDesign青岛国桥进出口有限公司(CBC)QingdaoChinaBridgeImp.&Exp.Co.,Ltd(CBC)二OO九年四月青岛国桥进出口有限公司QingdaoChinaBridgeImport&ExportCo.,Ltd.2第一章简介ChapterOneSummary我公司投资的10万吨糖蜜酒精,用甘蔗汁为原料产生废糖蜜经过发酵生产酒精,在生产酒精的过程中产生高浓度有机废水。酒精废水未经处理就近排入水体,会造成一定程度的污染,因此,必须建设配套的污水处理设施。Theprojectof100,000Tmolassesalcoholproductline,usesugarcanejuiceasrawmaterialtoproducesugarcanejuice,afterfermentation,itproducealcohol.Meanwhile,highconcentratedorganicwastewaterisbroughtout.Ifchargethewastewaterwithouttreatment,itwillresultinpollution.Therefore,thematchingwastewatertreatmentisnecessarytobuild.工程规模为日处理酒精废水3372m3/Projectscale:dealwithalcoholwastewater3372m3perday.污水处理采用厌氧—好氧处理工艺/Thewastewatertreatmentadoptsanaerobic+aerobicprocess.工程总投资为5821400美元/Thetotalinvestmentis5,821,400U.S.dollars.污水处理运行成本为0.225美元/m3。Therunningcostforwastewatertreatmentis0.225U.S.dollars/m3.第二章工程规模与处理程度ChapterTwoProjectscaleandtreatmentlevel第一节规模的确定SectiononeScalecontrol根据我公司对糖蜜酒精污水处理的治理经验,及厂方提供的数据,确定水量如下:Accordingtotheexperienceonmolassesalcoholwastewatertreatmentandinformationprovidedbythefactory,thedeterminedwaterqualityisasfollows:糖蜜酒精酒糟水为3372m3/d(含水93.4%)Molassesalcoholdistiller'sgrainswater3372m3/d(moisturecontent93.4%)经板框过滤后水量为2300m3/d。Waterquantityafterplateandframefilterpressis2300m3/d.第二节进水水质的确定SectiontwoQualitycontrolofinflowwater青岛国桥进出口有限公司QingdaoChinaBridgeImport&ExportCo.,Ltd.3参照同类生产企业的酒精废水参数,及公司确定精废水处理工程的进水水质设计为:CODcr≤80000mg/l(板框过滤前)CODcr≤45000mg/l(板框过滤后)BOD5≤25000mg/lSS≤5000mg/lNH3-N≤180mg/lPH:4—4.5T≤80℃Referringtothemolassesalcoholparametersofthesametypemanufacturefactoriesandthedeterminedwastewatervalue,thedesignisasfollows:CODcr≤80000mg/l(beforeplateandframefilterpress)CODcr≤45000mg/l(afterplateandframefilterpress)BOD5≤25000mg/lSS≤5000mg/lNH3-N≤180mg/lPH:4—4.5T≤80℃第三节污水处理程度的确定SectionThreeWastewatertreatmentlevel污水处理工程对污水中主要污染物的处理程度是确定处理工艺的基本依据。而处理程度主要依据污水处理厂出水受纳水体的水体标准和环境容量,依照国家颁布的有关排放标准来确定根据《中华人民共和国污水综合排放标准》(GB8978—1996),排入该水体的污水执行二级标准,即污水处理站的出水水质应达到:Inthewastewatertreatmentproject,thedisposallevelforthemainpollutantsinwastewateristhebasiccriteriontodesigntheprocess.Thedisposalleveldependsonthereceivingwaterbodyofwaterstandardsandenvironmentalcapacity.InaccordancewiththePeople'sRepublicofIntegratedWastewaterDischargeStandard(GB8978-1996),executethesecondaryeffluentstandardsforwastewaterdischargedinthewaterbody,thatis,effluentwaterfromwastewatertreatmentplantshouldmeetthefollowingquality:CODcr≤300mg/lBOD5≤150mg/lSS≤200mg/lPH:6-9NH3—N≤25mg/l根据进水水质和出水水质的要求,显然简单的机械处理不能满足要求,因此本工程将采用厌氧—好氧生物处理的方式以达到上述要求。Accordingtotherequirementsofinletandoutletwaterquality,apparentlysimplemechanicalprocessingcannotmeettherequirementsofthisproject.Therefore,anaerobic+aerobicprocessisadopttomeetaboverequirements.第三章污水处理工艺的确定青岛国桥进出口有限公司QingdaoChinaBridgeImport&ExportCo.,Ltd.4ChapterThreeWastewatertreatmentprocess第一节处理工艺选择SectionOneTreatmentprocess污水处理工艺的选择直接关系到出水水质指标能否达到要求,关系到运行是否稳定可靠,管理是否方便以及投资和运行成本的高低。因此,慎重选择适当的处理工艺是污水处理设计的关键。Thechoiceofwastewatertreatmentprocesswilldirectlyaffecttotheoutletwaterquality,steadilyrunning,management,investmentandoperationcost.Therefore,carefulselectionofappropriatetreatmenttechnologyisthekeyforwastewatertreatment.糖蜜酒精废水是高浓度、高温度的有机废水,因此简单的机械和物化的方法不能保证污水处理的稳定达标排放,高浓度有机废水如果直接进行好氧处理,势必会造成能耗过高,从而增加污水处理的运行成本,而单独的厌氧处理也不能直接达标排放。因此,本污水处理工程采用厌氧+好氧的处理方法。Themolassesalcoholwastewaterisorganicwastewaterwithhighconcentrationandhightemperature.Sosimplemechanicalandphysic-chemicalmethodcannotguaranteethequalifieddischargeofwastewater.Ifdirectlyuseaerobictreatmentforhighconcentratedorganicwastewater,itwillleadtohighcost.Andtheanaerobictreatmentalonecannotreachtherequirementeither.Therefore,thewastewatertreatmentprojectadoptsanaerobic+aerobictreatment.一、厌氧工艺的选择/Anaerobicprocess目前应用于高浓度废水处理成熟的厌氧方案主要有UASB和BIC,因此针对这两种厌氧工艺进行比较如下:Atpresent,therearetwokindsofmatureprocess,UASBandBIC,todisposethehighconcentratedwastewater.therefore,comparethebothprocessesasfollows:(一)UASB厌氧反应器/UASBanaerobicreactorUASB即为上流式厌氧污泥床反应器,为第二代厌氧反应器的典型代表。整个反应器主体可分为两个区域:反应区和气、液、固三相分离区。污水通过水泵提升到厌氧反应器的底部,利用底部的布水系统将污水均匀地布置在整个截面上,同时利用进水的出口压力和产气作用,使废水与高浓度的厌氧污泥充分接触和传质,将废水中的有机物降解。废水在反应区缓慢上升,进一步降解有机物。气体、水、污泥在同时上升过程中,沼气首先进入三相分离器内部通过管道排出,污泥和废水通过三相分离器的缝隙上升到分离区,污泥在分离区沉淀浓缩并回流到三相分离器的下部,保持厌氧反应器内的生物量,沉淀后的出水通过管道排出罐外。青岛国桥进出口有限公司QingdaoChinaBridgeImport&ExportCo.,Ltd.5UASBisup-flowanaerobicsludgeblanketreactor,itisthetypicalrepresentativeofthesecondgeneratedanaerobicreactor.Thewholereactorcanbedividedintotworegions:reactionzoneandthree-phaseseparationzoneofgas,liquidandsolid.Upgradethewastewatertothebottomofanaerobicreactorbywaterpump,distributethewastewateronthewholesectionbyuseofwaterdistributor,meanwhile,utilizetheoutletpressureandaerogenesistomakewastewaterandhighconcentratedanaerobicsludgehaveenoughcontactandmasstransfer,andfinallydegradetheorganicmatterinwastewater.Thewastewaterslowlyriseinthereactionzoneandfurtherdegradetheorganiccompounds.Inthe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