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1、第26卷第11期中國(guó)給水排水Vol_26No.112010年6月CHINAWATER&WASTEWATERJun.2010臭氧氧化去除飲用水消毒副產(chǎn)物二氯乙酸翟旭,陳忠林,劉小為,趙淑清,楊磊,王鶴(哈爾濱工業(yè)大學(xué)城市水資源與水環(huán)境國(guó)家重點(diǎn)實(shí)驗(yàn)室,黑龍江哈爾濱150090)摘要:采用臭氧氧化技術(shù)降解飲用水中的消毒副產(chǎn)物二氯乙酸(DCAA),考察了DCAA初始濃度、臭氧投量、pH、叔丁醇和不同水質(zhì)等對(duì)DCAA去除效果的影響。結(jié)果表明,臭氧對(duì)DCAA的氧化去除效果較好,當(dāng)DCAA初始濃度為100L、pH值為6.88、臭氧投量為1.96mg/L、反
2、應(yīng)時(shí)間為25min時(shí),對(duì)DCAA的去除率為32.4%;在相同的試驗(yàn)條件下,臭氧對(duì)DCAA的去除率隨DCAA初始濃度的增大而降低、隨臭氧投量和溶液pH的增大而升高。叔丁醇(·OH抑制劑)的加入顯著抑制了臭氧對(duì)DCAA的氧化去除效果,表明臭氧氧化DCAA的過程主要遵循羥基自由基反應(yīng)機(jī)理。另外發(fā)現(xiàn),臭氧對(duì)給水廠濾后水和松花江原水中DCAA的去除率比超純水中的分別降低了7.06%和19.58%,由此推測(cè)實(shí)際水體中的有機(jī)物和重碳酸鹽會(huì)抑制臭氧對(duì)DCAA的氧化降解。關(guān)鍵詞:臭氧氧化;飲用水;消毒副產(chǎn)物;二氯乙酸中圖分類號(hào):TU991文獻(xiàn)標(biāo)識(shí)碼:c文章編號(hào)
3、:1000—4602(2010)11—0139—03RemovalofDichl0rOaceticAcidfromDrinkingWaterbyOzonationZHAIXu,CHENZhong—lin,LIUXiao—wei,ZHAOShu—qing,YANGLei,WANGHe(StateKeyLaboratoryofUrbanWaterResourceandEnvironment,HarbinInstituteofTechnology,Harbin150090,China)Abstract:Theozonationtechnologyw
4、asusedtodegradedichloroaceticacid(DCAA),adisinfec-tionby—productindrinkingwater.TheeffectsofDCAAconcentration,ozonedosage,pHvalue,tert—bu—tylalcoholanddifferentwaterqualitiesontheremovaleficiencyofDCAAwereinvestigated.TheresultsshowthattheremovaleficiencyofDCAAbyozonationis
5、excellent.TheremovalrateofDCAAis32.4%whentheDCAAinitialconcentrationis100g/L,pHis6.88,ozonedosageis1.96mg/Landreactiontimeis25min.Underthesameexperimentalconditions,theremovalrateofDCAAisreducedwiththeincreaseoftheinitialDCAAconcentrationandisincreasedwiththeincreaseofozone
6、dosageandpHval—ue.Theadditionoftert—butylalcoholobviouslyinhibitstheremovalofDCAA,indicatingthattheremovalofDCAAduringozonationmainlyfollowsahydroxylradicaltypemechanism.ItisfoundthattheremovalratesofDCAAinfiltratedwaterandSonghuaRiverwaterarereducedby7.06%and19.58%compared
7、tothatinultrapurewater,showingthatorganiccompoundsandbicarbonateinactualwaterwouldinhibitthedegradationofDCAAbyozonation.Keywords:ozonation;drinkingwater;disinfectionby—product;dichloroaceticacid液氯是目前普遍采用的飲用水消毒劑,但其在消毒過程中會(huì)與水中的天然有機(jī)物(NOM)反應(yīng)生基金項(xiàng)目:國(guó)家“十一五”科技支撐計(jì)劃項(xiàng)目(2006BAJ08B02);國(guó)
8、家高技術(shù)研究發(fā)展計(jì)劃(863)項(xiàng)目(2007AA06Z339)·139·第26卷第1I期中國(guó)給水排水成毒性很大的消毒副產(chǎn)物‘,對(duì)人體健康造成了m)。極大的威脅。三鹵