污泥底泥重金属生物淋滤效果研究

污泥底泥重金属生物淋滤效果研究

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时间:2019-05-22

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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,

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