The treatment and reuse of wastewater in the textile industry by means of ozonation and electroflocculation

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1、Wat.Res.Vol.35,No.2,pp.567±572,2001#2000ElsevierScienceLtd.AllrightsreservedPrintedinGreatBritainPII:S0043-1354(00)00286-40043-1354/00/$-seefrontmatterTECHNICALNOTETHETREATMENTANDREUSEOFWASTEWATERINTHETEXTILEINDUSTRYBYMEANSOFOZONATIONANDELECTROFLOCCULATION1M2yGIANLUCACIARDELLI*andNICOLARAN

2、IERI12Tecnotessiles.r.l.,viadelGelso13,I-59100Prato,ItalyandDipartimentodiChimicaeChimicaIndustriale,UniversitaÁdiPisa,viaRisorgimento35,I-56126Pisa,Italy(Firstreceived27August1999;acceptedinrevisedform10May2000)Abstract}Twodifferentoxidationtreatments,ozonationandelectro¯occulation,wereexp

3、erimentedonapilotscaletotesttheireciencyinremovingpollutingsubstancesfromwastewatersoftextileindustries.Bothpilotplantsusedreproducedverycloselyafull-scaletreatmentinordertoobtainindicationsaboutthefeasibilityofatransferonindustrialscale.Bymeansofozonetreatmentveryhighcolourremoval(95±99%)

4、wasachievedandtreatedwaterswerereusedsatisfactorilyindyeingevenwithlightcolours.Thisevidencedespitethefactthatthechemicaloxygendemandoftreatedwaterswasstillinarange(75±120mg/l,adecreaseupto60%)thatwasusuallyconsideredtobetoohighforrecyclingpurposes,especiallyfordyeinglightcolours.Treatingp

5、lantsworkingattheabove-mentionedconditionsshouldguaranteelowoperatingcosts.Abiologicalpre-treatmentandasand®ltrationareabsolutelyessential.Thetransferonindustrialscaleofthetreatmentiscurrentlyunderdevelopmentunderanalready®nancedEuropeanproject.Electrochemicaltreatmentshowedtobeveryecienti

6、nremovingcolour(80±100%)andchemicaloxygendemand(70±90%).Moreover,asensibledecreaseofchlorideandsulphateionswasdetected.Removalof¯occulatedmaterial(post-treatment)mustbe,however,perfectedinordertoestablishacorrectcosts-to-bene®tsratioandtherefore,proposeanimplementationofthetechniqueonanind

7、ustrialscale.#2000ElsevierScienceLtd.AllrightsreservedKeywords}colourremoval,dyeing,electrochemicaltreatment,ozonation,textilewastewatersINTRODUCTIONover,veryeffectivetowardstheoxidationofchro-mophoricstructuresofdyes,removingcolourwhichWetprocessesinthetextile