采用CTB工艺提高污泥热值的工程实例研究

CTB蔡璐1,陈同斌1,高定1,刘洪涛1,郑国砥1,杜伟2(1.中国科学院地理科学与资源研究所环境修复中心,北京100101;2.北京中科博联环境工程有限公司,北京100080):采用智能控制高温好氧生物发酵工艺(CTB工艺)对脱水城市污泥进行生物干化处理,使污泥的含水率从80%降到45%,并且干化后物料的热值比原污泥增加了2.7%~14.0%若用于焚烧,可使系统的净能量由干化前的亏损状态提高到4500kJ/kg以上,污泥的挥发性固体含量与热值呈显著正相关从能量平衡的角度考虑,采用生物干化工艺处理脱水污泥,提高了焚烧过程的净能量,解决了脱水污泥直接焚烧的能量亏损问题:城市污泥;好氧生物发酵;生物干化;CTB工艺:X703:C:1000-4602(2010)19-0103-03EngineeringCaseStudyonImprovementofSludgeCalorificValuebyCTBTechnologyCAILu1,CHENTongbin1,GAODing1,LIUHongtao1,ZHENGGuodi1,DUWei2(1.CenterforEnvironmentalRemediation,InstituteofGeographicSciencesandNaturalResourcesResearch,ChineseAcademyofSciences,Beijing100101,China;2.BeijingGreenTechEnvironmentalEngineeringCompany,Beijing100080,China)Abstract:Thecontroltechnologyforbiocomposting(CTB)wasusedforbiodryingtreatmentofdewateredsewagesludgetodecreasewatercontentfrom80%to45%,thecalorificvalueofdriedsamplesisincreasedby2.7%to14.0%,andthenetenergyofcombustionsystemisincreasedfromalossstatetomorethan4500kJ/kg.Thereisasignificantpositivecorrelationbetweenthevolatilesolidcontentandcalorificvalueofsewagesludge.Byconsideringtheenergybalance,thebiodryingprocessfortreatmentofdewateredsludgecanimprovethenetenergyofcombustionsystemandsolvetheproblemofenergylossfromdirectincinerationofdewateredsludge.Keywords:sewagesludge;aerobicfermentation;biodrying;CTBtechnology:(2007BAD87B01);(Z09040900930903),[1~3],,,103第26卷第19期2010年10月中国给水排水CHINAWATER&WASTEWATERVo.l26No.19Oct.2010200t,1材料与方法(200t/d),80%(CTB),CompsoftV3.0-()(),20d,20,1g,(75)(VS)(,4504h)2结果与讨论21,12043()13382kJ/kg(),12371()15260kJ/kg(),,1(1250416695kJ/kg)(1668618593kJ/kg),;,,,1,,2.7%()14.0%()2280%,,80%2940kJ/kg,,80%,14680kJ/kg[4],(12043~13382kJ/kg),,,80%45%,153%45%[45],3346kJ/kg[6],,53%CTB45%,1689kJ/kg,6200kJ/kg,4500kJ/kg1Tab.1Dryingenergyconsumptionandincinerationenergyproductionofsludgewithdifferentwatercontents/(kJkg-1)/%/(kJkg-1)/(kJkg-1)/(kJkg-1)1468080294029400120435319455662371745168962904601133825319456503455845168972265537,,45%~50%[7~10],,,21t80%45%,,2Tab.2Comparisonofdryingcostsbetweenbiodryingandthermaldrying//29~38kWh16~21100~130kg30~4046~6164~128kWh35~70()82~122kg59~8294~152:(2009),1t80%45%,29~38kWh,30~40(2007),1t:100~200kWh+(85%,104第26卷第19期中国给水排水)[1112]1t80%45%,0.64,t64~128kWh,2.04!106kJ[1213],70kg(29306kJ/kg);16730~25100kJ/kg,82~122kg2,80%45%,CTB,51%~60%,,,23VS,,,[9]VS(1),,VS,,VS(P0.01),,,VS1VSFig.1RelationshipbetweenVScontentandcalorificvalue3结论CTB,80%45%,4500kJ/kg;,2.7%~14.0%,,:[1],,,.[J].,2002,22(5):736-741.[2],,,.[J].,2009,25(11):117-120.[3],,,.[J].,2007,23(4):7-10.[4]StastaP,BoranJ,BebarL,etal.Thermalprocessingofsewagesludge[J].ApplThermEng,2006,26(13):1420-1426.[5]PtasinskiKJ,HamelinckC,KerkhofPJAM.Exergyanalysisofmethanolfromthesewagesludgeprocess[J].EnergyConversManage,2002,43(9-12):1445-1457.[6].[M].:,2006.[7]WertherJ,OgadaT.Sewagesludgecombustion[J].ProgEnergyCombustSc,i1999,25(1):55-116.[8]NadziakiewiczJ,KozioM.Cocombustionofsludgewithcoal[J].ApplEnergy,2003,75(3-4):239-248.[9].[M].:,2006.[10]FytiliD,ZabaniotouA.UtilizationofsewagesludgeinEUapplicationofoldandnewmethods∀Areview[J].RenewableandSustainableEnergyReviews,2008,12(1):116-140.[11]VaxelaireJ,BongiovanniJM,MousquesP,etal.Thermaldryingofresidualsludge[J].WaterRes,2000,34(17):4318-4323.[12],,.[J].,2007,23(8):5-8.E-mail:[e-mail]:2010-03-04105蔡璐,等:采用CTB工艺提高污泥热值的工程实例研究第26卷第19期