污泥底泥重金属生物淋滤效果研究

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1、湖南大学硕士学位论文污泥（底泥）重金属生物淋滤效果研究姓名：邹塞申请学位级别：硕士专业：环境工程指导教师：张盼月20080425硕上学位论文AbstractThebioleachingprocess，whichleadstoacidificationandsolubilizationofheaVymetaIs，isrecommendedasaneconomicalandeffectiveprocessfortheremoValofheavymetalfromsewagesludge．砌fD6口cf，“is

2、agroupoforganismsrecommendedaseffectivebacteriaforbioleaching．Inthispaper，the0ptimumparameters0fbioleachingofsewagesludgcwithisolated弛fD6口ciZ疗(z砌fDnxfd口万sandz厂e，，DDzfd口万sJwerebasicanyfeviewed．Basedontheirtheoreticalsimilarityandanalogy，thereactionmechanis

3、mswerestudied．ThepurposesofthestudyarequantitativelyandqualitativelytoinVestigatetherelationshipbetweenVariouspHysicochemicalparametersandmetalleachingandtoproVideabetterunderstandingforthetreatmentofheavymetalfromsewagesludge．Influences0ftherati00fsulfhr

4、additiont0thetotalsolidinsewagesludge(SA／TS)werestudiedonthebioleachingofheaVymetalsusingmixedZ砌fDD茗fd4厅sliquor．TheresultsshowthathigherSA／TSsignificantlyacceleratestheacidification0fsludgeandincreasestheefficiencyofheavymetalbioleaching．TheoptimalSA√TSra

5、tiois2．5．underwhich66．2％0fCuand63．9％ofZnafeleachedoutafter8daysand30．8％ofPbisleachedoutafter16days．Cumainlyexistsasorganic-Cubothbeforeandafterthebioleaching．AhighpefcentageofoxidesboundZnissolubilized．After16dbioleaching，oxidesboundPbdecreaseswhileorgani

6、cboundPbincreases．AhigherSA仃Sratioimprovestheutilizationofsulfur，insignificantlyimpactsthepreservationofnitrogen，butpromotesthelossofpHospHorous·XiawangangStreamwasseriouslypollutedbyheaVymetals．Itssedimentwasveryspecialbecauseofthehighalkalinityandthehig

7、hcontentofheaVymetals·ExperimentswerccarriedouttoassesstheinnuenceofinitialpHofthesyst锄onbioleaching0fzinc，copperandcadmium．Resultsshowthatthebioleachingcannotstart．upeffcctively，whentheinitialpHis7．ForCu，ZnandCdsolubilization，similarbioleachingefficiency

8、wasrcachedwhensettingtheinitialpHat6，5，4，butthcinitialpH6seemestobethebest0netbrbioleaching．’rakingheaVymetalsremoValandeconomiccostsintoaccount，theinitialpH6isoptimal．Theloosesedimentsbecomemassiveafterbioleaching，