钢铁酸洗废水常温常压下制备高浓度聚铁溶液的研究谢蔚嵩

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:0490-6756(2006)04-0878-06谢蔚嵩,谢长红,袁 晶,张凌云,谢家理*(,610064):以钢铁酸洗废水为原料,NaClO3为氧化剂,利用反应过程中产生的热量并通过补充投加的方法,在常温常压无需任何加热条件下成功制得了浓度可达210g/L的高浓度聚铁溶液,并用制得的聚铁与改性单宁复配,进一步制得了阳离子单宁·聚铁复合絮凝剂.通过对粘土悬浊液和碱性造纸废水的处理实验证明,所制得的聚铁产品具有较好的絮凝效果,浊度去除率较高,对可过滤态CODCr也有一定的去除效果,而复合絮凝剂具有更好的絮凝效果,对可过滤态CODCr去除率可达50%以上.:钢铁酸洗废水;聚合硫酸铁;复合絮凝剂;造纸废水:X703   :A1   Fe2+,Fe2+、,pH0.2~1.0.,,FeSO4[1].,,,、.(,PFS),、(COD、、)、、、、,,、、[2].,.PFS,,.,NaClO3,H2O2、、、.,NaClO3,,-,,COD.,,,,,,,.2   NaClO3,,NaClO3(Fe2+)(Fe3+),,———.::2006-01-04*2006年8月第43卷第4期四川大学学报(自然科学版)JournalofSichuanUniversity(NaturalScienceEdition)Aug.2006Vol.43No.4        6Fe2++ClO-3+6H+=6Fe3++Cl-+3H2O      Fe3++OH-=[Fe(OH)]2+      [Fe(OH)]2++OH-=[Fe(OH)2]+      [Fe(OH)2]++OH-=Fe(OH)3      Fe2(SO4)3+nH2O=Fe2(OH)n(SO4)3-n/2+n/2H2SO4      mFe2(OH)n(SO4)3-n/2=[Fe2(OH)n(SO4)3-n/2]m:n2,m=f(n).,[Fe2(OH)3(H2O)7]3+,[Fe2(OH)2(H2O)8]4+,[Fe(OH)(H2O)5]2+,OH-,,1×105[3].3 :(),250mL,(),(5%),FeSO4·7H2O(),(),(),.3.1 Fe2+,Fe3+.Fe2+Fe3+.3,[4].,Fe2+Fe3+3.41mol/L0.12mol/L.FeSO4·7H2OFe2+,Fe2+18.82%.3.2 3.2.1  2mL,200mL(Fe2+3.41mol/L)14.53gNaClO310,,NaClO3,5min.10min,,().FeSO4·7H2O、NaClO3,1h,,.3.2.2 - ,mCAT,mPFS,、3,CODCr[5].,.,,n,,R,R/n.n,(,),,.3.3 .150r/min1min,40r/min5min,30minCODCr.3.3.1  ,48h,1000mL.,20.50mL500mL,500mL,pH,,.[6].3.3.2  -,COD,.20,,CODCr3260mg/L,pH9~10.200mL,,879第4期     谢蔚嵩等:钢铁酸洗废水常温常压下制备高浓度聚铁溶液的研究.pH,CODCr.CODCr,“———”[7].4 4.1 ,,,,,.4.1.1  ,(NaClO3),.n(Fe2+)∶n(NaClO3)Fe2+,1.1 n(Fe2+)∶n(NaClO3)Fe2+(25℃)Tab.1 Theeffectofn(Fe2+)∶n(NaClO3)totheinvertrateofFe2+n(Fe2+)∶n(NaClO3)Fe2+(%)10min30min50min70min1∶0.1694.3195.4696.0997.461∶0.1896.3298.6899.0799.391∶0.2098.8699.6699.831001∶0.22100100100100  ,n(Fe2+)∶n(NaClO3)1∶0.18,Fe2+,1∶0.20,Fe2+,n(Fe2+)∶n(NaClO3)=1∶0.20.4.1.2  ,.n(Fe2+)∶n(NaClO3)1∶0.2,Fe2+,2.2 Fe2+Tab.2 TheeffectoftemperaturetothetheinvertrateofFe2+(℃)Fe2+(%)10min30min50min70min2598.8699.6699.831003599.2099.8099.901004099.8610010010045100100100100  ,,,Fe2+.35℃,Fe2+Fe3+.NaClO3,,40℃.4.1.3  ,(B)n/6(n).B,PFS.,B,B,PFS,B.,,.3n(Fe2+)∶n(H2SO4)()PFS.,PFS1∶0.2.PFSn(Fe2+)∶n(H2SO4)∶n(NaClO3)=1∶0.2∶0.2.5%,,880四川大学学报(自然科学版)              第43卷2mL.3 n(Fe2+)∶n(H2SO4)PFSTab.3 Theeffectofn(Fe2+)∶n(H2SO4)tothebasicityofPFSn(Fe2+)∶n(H2SO4)1∶0.101∶0.151∶0.201∶0.25PFS(%)20.5718.3517.5716.454.1.4  ,,(65℃),.,10,,,、,,.,5min,5min,40℃,.4.1.5  10,(),,FeSO4·7H2O,NaClO3,(20gFeSO4·7H2O,1.453gNaClO30.76mL),10min,ρ(∑Fe).,ρ(∑Fe),ρ(∑Fe),ρ(∑Fe),..1h,,,210g/L,18.5%.4.2 -L16(43),(A)、(B)、(C)CODCr,.:,pH9.0,CODCr=3260mg/L.4 L16(43)Tab.4 TheanalysisofresultwithorthogonaltestofL16(43)ABCCODCr(%)ABCCODCr(%)11:3200.540.291:3401.546.321:4201.050.3101:4402.050.531:5201.548.2111:5400.549.441:6202.048.3121:6401.050.151:3301.045.2131:3502.042.461:4301.551.2141:4500.549.771:5302.050.4151:5501.049.981:6300.548.4161:6501.545.8  ,,mCAT:mPFS=1∶4,30℃,1.5h.,.5 5.1 5.1.1  50mL500mL,500mL,90o,pH7.20(),881第4期     谢蔚嵩等:钢铁酸洗废水常温常压下制备高浓度聚铁溶液的研究1.1,60mg/L,,97%.5.1.2 pH 60mg/L,pH,2.  2,pH6,.图1 投加量对浊度去除效果的影响Fig.1 Theeffectofaddedamountsto   theremovalofturbidity       图2 pH值对浊度去除效果的影响Fig.2 pHeffecttotheremoval   ofturbidity 5.2 200mL,pH9,20℃-,()pHCODCr.5.2.1  3.3,CODCr,,,CODCr50%,,,,,CODCr.5.2.2 pH pH4.图3 投入量对可过滤态COD去除率的影响Fig.3 Theeffectofaddedamountstothe   removaloffiltrableCOD    图4 pH值对可过滤态COD去除率的影响Fig.4 pHeffecttotheremoval   offiltrableCOD   4,(125mg/L),-882四川大学学报(自然科学版)              第43卷pH,,,.6   ,NaClO3,,-.,,,,.  ,,.,90%,CODCr,CODCr50%.:[1] ,.[J].,1999,30(3):33.[2] .[J],1997,28(3):39.[3] .[J],1999,,1999,29(4):34.[4] ,.[J],,2003,25(12):34.[5] .-[J],,2004,24(2):11.[6] .GB13200-1991[S].:,2001.[7] .GB11914-1989-[S].:,2001.TheResearchofMakingHighConcentrationPolymerizedIronliquorbySteelPicklingWasteLiquorinNormalTemperatureandPressureXIEWei-song,XIEChang-hong,YUANJing,ZHANGLing-yun,XIEJia-li(CollegeofChemistry,SichuanUniversity,Chengdu610064,China)Abstract:Byusingsteelpicklingwasteliquorasmaterial,NaClO3asoxidantandtakingadvantageoftheheatinthereactionandreinforce,thehighconcentrationPolymerizedIronliquorwerepreparedinnormaltempera-tureandpressurewithoutcalefaction.Theconcentrationcanreach210g/L.ThentheCationictannin-polyironComplexCoagulantwerepreparedbyblendingcationictanninandpolymerizediron.TheexperimentalresultsoftreatingclaysolutionandpapermakingwastewatershowedthatPolymerizedIronliquorhadexcellenteffectintheremovalsofchaotic,andhadnormaleffectintheremovalsoffiltrableCODcr,andthecomplexcoagulanthadbettereffectintheremovalsoffiltrableCODcr,theremovalratecanreach50%.Keywords:steelpicklingwasteliquor;polymerizediron;complexcoagulant;papermakingwastewater883第4期     谢蔚嵩等:钢铁酸洗废水常温常压下制备高浓度聚铁溶液的研究

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