资源描述：
《supplementation of inorganic phosphate enhancing t》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、Supplementationofinorganicphosphateenhancingtheremovalefficiencyoftannerysludge-borneCrthroughbioleachingGuanyuZheng,LixiangZhou*DepartmentofEnvironmentalEngineering,CollegeofResourcesandEnvironmentalSciences,NanjingAgriculturalUniversity,Nanjing,JiangsuProvince210095,Chinaarticleinf
2、oArticlehistory:Received27March2011Receivedinrevisedform14July2011Accepted25July2011Availableonline2August2011Keywords:BioleachingTannerysludgeNutrientsInorganicphosphateabstractFourinorganicmineralnutrientsincludingNHþ4,Kþ,Mg2þandsolubleinorganicphosphate(Pi)wereinvestigatedtorevea
3、lthepotentiallimitingnutrientsfortannerysludgebiol-eachingprocessdrivenbyAcidithiobacillusspecies,andthefeasibilityofsupplementingthelimitingnutrientstoacceleratetannerysludgebioleachingwasstudiedinthepresentstudy.ItwasfoundthattheconcentrationofPiwaslowerthan3.5mg/Lthroughoutthewho
4、lebioleachingprocess,whichisthemostprobablerestrictingnutrientfortannerysludgebioleaching.FurtherexperimentsrevealedthatthedeficiencyofPicouldseriouslyinfluencethegrowthofAcidithiobacillusthiooxidansandloweritsoxidizationcapacityforS0,andthelimitingconcentrationofPiforthegrowthofA.thi
5、ooxidanswas6mg/L.ThelowconcentrationofsolublePiinsludgematrixwasresultedfromtheextremelystrongsorbing/bindingcapacityoftannerysludgeforphosphate.Thesupplementationofmorethan1.6g/LKH2PO4intotannerysludgebioleachingsystemcouldeffectivelystimulatethegrowthofAcidithiobacillusspecies,enh
6、anceCrremovalrateandfurthershortentannerysludgebioleachingperiodfrom10daysto7days.Therefore,inorganicphosphatesupplementationisaneffectiveandfeasiblemethodtoacceleratetannerysludgebiol-eachingprocess,andtheoptimumdosageofKH2PO4was1.6g/Lfortannerysludgewith5.1%oftotalsolids.ª2011Else
7、vierLtd.Allrightsreserved.1.IntroductionCr(III)compoundsareextensivelyusedintanningprocesstoprotectleatheragainstmicrobialdegradation,moisture,sweatandsoon(Erdem,2006;Zhengetal.,2009).However,alargeamountofchromiumstillremainsinthetanneryeffluentaftertanningprocessbecauseoflowreactio
8、neffi-ciencyofCr(III
