高浓度焦化废水的预氧化混凝处理研究吴克明

22420067WATERRESOURCESPROTECTIONVol.22No.4Jul.2006　　:(2001B19003):(1964—),,,,,。E-mail:[e-mail]-,,,(,　430081):焦化废水成分十分复杂,污染物浓度高,性质非常稳定且水量大,是典型的难降解有机废水。使用H2O2为氧化剂,FeSO4·7H2O为催化剂的Fenton氧化法对钢铁焦化厂废水的终冷水进行了试验研究,氧化处理后用FeCl3为混凝剂对COD,NH3-N,色度及浊度的去除率进行了系统的考查。确定了氧化反应的影响因素和最佳的混凝实验条件。结果表明:当pH值控制在3左右,反应时间为30min,反应温度为80℃,焦化废水的COD,NH3-N,浊度和色度去除率分别达到了93.1%,96.2%,90.8%和90.2%。:废水处理;预氧化;Fenton法;混凝;焦化废水:X703.1　　　:A　　　:1004-6933(2006)04-0075-03Treatmentofhighconcentrationcokingwastewaterwithproxidation-coagulationprocessWUKe-ming,CHENXin-qiang,CAOJian-bao,ZHANGCheng-zhou(DepartmentofEnvironmentalandSafeEngineering,WuhanUniversityofScienceandTechnology,Wuhan430081,China)Abstract:Withhighconcentrationofcontaminants,stablecharactersandhighwaterquantity,cokingwastewateriscomplicatedanddifficulttobetreated.TakingH2O2asoxidant,FeSO4·7H2Oascatalyst,Fentonoxidationmethodwasusedtotreatfinalcoldwastewaterfromsteelcokingplants.Afteroxidation,FeC13wasusedascoagulant,andtheremovalratesofCOD,NH3-N,colorityandturbiditybyFeC13werestudied.Theinfluencingfactorsandoptimumcoagulationconditionswereinvestigated.TheresultsshowedthattheremovalratesofCOD,NH3-N,turbidityandcoloritycouldreach93.1%,96.2%,90.8%and90.2%respectivelyundertheconditionsofpH=3,oxidationtime=30min,andtemperature=80℃.Keywords:wastewatertreatment;preoxidation;Fentonprocess;coagulation;cokingwastewater　　、,,、、、、、、,、、、、。、、,,,COD。,、、。,[1]。,。,,、COD。H2O2-,。1　　1.1　4·75·:①;②;③;④、、、。,。、、、、、、,,、、。,。:106～160NUT;pH7～8;70～126;ρ(CODCr)2309～2908mg/L;120～160mg/L;80～150mg/L;170～220mg/L;ρ(NH3-N)53～87mg/L。1.2　a.。,,,,。b.。H2O2(30%),FeSO4·7H2O,(PSiAC),(PSiFC),(FeCl3),PAC,,。c.。;pHpH;;COD;,,,[2]。2　、、、、、,,COD、、、NH3-N,,FeSO4·7H2O,H2O2,。,pH、Fe2+、H2O2。2.1　,,80NTU,。,pH4,0.3g/LFeSO4·7H2O20mg/LH2O2,60℃,30min,(PAC)、(PSiAC)、(PSiFC)、(FeCl3),,1。1　/(mg·L-1)COD/%/%FeCl314091.390.1、,PAC20090.285.2、,PSiAC24089.082.4、,PSiFC26089.684.6、,2,FeCl3,FeCl3。2.2　100mL,0.3g/LFeSO4·7H2O30mg/LH2O2,60℃,30min,H2SO4NaOHpH,,FeCl3140mg/L,1。1　1,pH,COD。pH3,COD92.2%,pH4,80.2%。pH,COD。Fe2+pH[3],,Fe2+H2O2·OH。pH3～4。2.3　FeSO4·7H2OpH330mg/LH2O2,FeSO4·7H2O,FeSO4·7H2O,FeCl3140mg/L,30min,60℃,2。2　FeSO4·7H2O2,FeSO4·7H2O,·76·COD,FeSO4·7H2O0.3g/L,COD92.5%79%,FeSO4·7H2O,COD,,Fe2+Fe3+[4]。2.4　H2O2pH3,0.3g/LFeSO4·7H2O,H2O2,FeCl3140mg/L,30min,60℃。3。3　H2O23,COD,H2O230mg/L,COD92.6%77%,H2O2,COD,。Fenton,(Fe2+)·OH,·OH2.8V[5],[6],H3O2Fe2+(·OH),。:H2O2※2·OH(1)·OH+H2O2※HOO·+H2O(2)HOO·+H2O2※HO·+H2O+O2(3)Fe2++H2O2※Fe3++·OH+OH-(4)Fe3++H2O2※Fe2++HO2·+H+(5)Fe2++·OH※Fe3++OH-(6)Fe3++·HO2※Fe2++O2+H+(7)Fe2++HO2·※HO-2+Fe3+(8)　　,Fe2+,,H2O2[7]。,,H2O2COD,H2O2,。2.5　pH3,H2O2FeSO4·7H2O30mg/L0.3g/L,-,FeCl3140mg/L,30min,4。4　,,。Fenton,,,,Fenton。·OH[6],H2O2O2H2O。4:80℃,COD,COD;80℃,,。,。100mL,pH3,80℃,30mg/LH2O20.3g/LFeSO4·7H2O30min,140mg/LFeCl3,5min,30min,、、CODNH3-N,2。2　/NUT/ρ(COD)/(mg·L-1)ρ(NH3-N)/(mg·L-1)/(mg·L-1)　110.890.02693.873.4120.0　10.28.0186.02.86.7/%90.891.193.196.294.43　　a.FentonFeCl3,COD、NH3-N、、93.1%,91.1%,96.2%94.4%,Fenton。b.:FeSO4·7H2O0.3mg/L,H2O230mg/L,FeCl3140mg/L,pH3,30min,80℃。(下转第91页)·77·2　,。,,,,。,QBPM≥QAP0M0,。,。,。(3)、(4)。,,。,,,,,,,,,,。,,。,。,。,。,。,、、、,,。,,。,,。:[1].[M].:,1998.[2].———[M].:,2002.[3],,.[J].,2003,23(1):100-104.[4].[EB/OL].[2004-02-26].[5],,.[J].,2004,22(6):37-40.[6].[J].,2003(2):6-7.(:2005-01-06　:)(上接第77页)c.COD,,,FeCl3。d.Fenton,,,。:[1],.[J].,2000,26(6):35-37.[2],.[J].,1999,17(1):16-19.[3].[M].:,2000.[4],,.Fenton[J].,1997(6):23-24.[5].[M].:,2000.[6]CHIANGLC,CHANGJE.Electrochemicaloxidationprocessforthetreatmentofcoke-plantwastewater[J].JEnvironmentalScience,1995,30(4):753-771.[7]ZEPPERRG.HydroxylradicalformationinaqueousreactionpH=3～8ofironwithhydrogenper-oxidation:Thephoto-Fentonreaction[J].EnvironmentalScienceandTechnology,1992,26(2):313-320.(:2004-12-15　:)·91·