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1、（拟再审修改稿；稿件编号：201104050）生物淋滤改善城市污泥脱水性能研究肖凌鹏，张盼月*，张玉璇，马博强，孙德智(北京林业大学环境科学与工程学院,北京10083）摘要：污水处理过程中产生大量剩余污泥，使得污泥脱水逐渐成为污泥处理的关键环节。本研究采用生物淋滤方法处理城市污泥，改善污泥脱水性能。通过污泥比阻、滤饼含水率和离心脱水率的变化评价生物淋滤改善剩余污泥脱水性能的效能。综合考虑污泥脱水性能改善效果和运行成本，生物淋滤优化条件为：硫粉投加量3g/L；Fe2+投加量4g/L；接种物投加量0.4。在优化条件下，污泥体系被酸化至
2、pH为2.0左右需要36-48小时，淋滤污泥的比阻由1.26×1014m/kg降至8.14×1012m/kg，降低了93.54%，滤饼含水率从98.39%降至73.68%，同时污泥离心脱水率从72%提高到83%。回调淋滤污泥pH至6.0，污泥比阻继续降至8.27×1011m/kg，污泥比阻降低99.34%，污泥从难脱水状态转化为易脱水状态。通过污泥体系中铁离子和污泥絮体特征的变化，分析生物淋滤改善污泥脱水性能的机理。作为底物投加的Fe2+在微生物氧化作用下快速转化为Fe3+。生物氧化产生的Fe3+的絮凝作用可能是生物淋滤改善污泥脱
3、水性能的主要机理。关键词：城市污泥生物淋滤调理脱水比阻铁离子ImprovementofsewagesludgedewateringbybioleachingXiaoLingpeng,ZhangPanyue*,ZhangYuxuan,MaBoqiang,SunDezhi(CollegeofEnvironmentalScienceandEngineering,BeijingForestryUniversity,Beijing,China)Abstract:Becauseoflargequantitiesofexcesssewagesl
4、udgeproducedfromwastewatertreatmentplants,sludgedewateringhasbecomeonekeyofsludgetreatment.Sewagesludgebioleachingwasoptimizedtoimprovesludgedewaterability.Sludgedewaterabilitywasevaluatedwithspecificresistancetofiltration(SRF),watercontentoffiltercakeandratioofwaterv
5、olumetototalsludgevolumewithcentrifugalseparation.Consideringbothsludgedewaterabilityimprovementandoperationcost,theoptimumconditionsofsludgebioleachingwereasfollows:sulfurpowderadditionof3g/L,Fe2+additionof4g/Landinoculaadditionof0.4.Undertheoptimumbioleachingconditi
6、ons,36-48hourswereneededforpHvaluedecreasetoabout2.0;thesludgeSRFdecreasedfrom1.26×1014m/kgto8.14×1012m/kgwithaSRFreductionof93.54%,thewatercontentoffiltercakesdecreasedfrom98.39%to73.68%andtheratioofwatervolumetototalsludgevolumewithcentrifugalseparationincreasedfrom
7、72%to83%.AfteradjustingthepHofbioleachedsludgebackto6.0,thesludgeSRFfurtherdecreasedto8.27×1011m/kgwithatotalSRFreductionof99.34%,andthesludgecanberegardedeasytobedewatered.Changeofironspeciesinsludgesystemandsludgeflocspropertiesweremeasuredtoanalyzethemechanismsofsl
8、udgedewaterabilityimprovementbybioleaching.Fe2+ionsaddedasbioleachingsubstratewerequicklyconvertedtoFe3+throughmicroorganism
