低濃度臭氧化—生物過濾工藝深度處理城市污水的實驗研究.pdf

1、西安建筑科技大學碩士學位論文低濃度臭氧化—生物過濾工藝深度處理城市污水的實驗研究姓名：王晟申請學位級別：碩士專業(yè)：市政工程指導教師：王曉昌2002.3.1AbstractTertiaryTreatmentofDomesticWastewaterbyLowConcentratjon—OzonationandBiofiltrationforWaterReclamationSpecialty：MunicipalEngineenngAuthor

2、：WANGShengAbstract：P《WangXiaochangAbst陽ctTertiarytreatmentofdomesticwAstewaterwasconductedinpilotscaleatBeishiqiaoWastewaterPurificationCenterXi’allMunicipalityChinausingaprocessoflow—concentrationozonationfoIIowedbybiof

3、iltrationforwaterreclamationforindustriaIandmunicipalreuseThesecondaryeffluentwasintroducedintoaverticalflowozonereactorwithanaveragecontacttimeofl2minatartozonedoseof15me／LandthenledtoaGACfilterwithprecoatedbiofilmatara

4、teof8m／hAlthou吐theozonedosewasataIowleveltheprocessachievedaremarkableremoralofcolor—from3040cutolessthan10cuafterozonationandthentolesstitan5cuafterbiofiltrationThefilteredwaterwascompletelyfreeframoffensiveodorandwitht

5、urbidityIowerthan05ntuThekineticsofozonationwerealsodiscussedonthebasisofbatchexperimentdataThedecayCHIVeofUV254withrespecttocontacttimecanhecharacterizedbythreesections：withinthefirst2or3minutesitfoIlowsalinearrelationw

6、ithagreatreactionratethenitfitsanexponentialrelationtillthetimeofl0minandafterthispointitappearstobeahorizontal1ineshowingtheterminationofreactionTheozonecontacttimedecidedbvthiswaywasprovedappropriateinpilotscaleapparat

7、usByozonation，theUVabsorbanceat254nm(UV凹4)wasremovedby60％whileToeremova]wasonlyabout13％indicatingthatacompleteremovaloforganicsubstancescannotbeachievedataIowozonedosebutaIargeamountoftheUVsensitivesubstancesareoxidizedi

8、ntoUVinsensitivesubstanceswhicharemorebiodegradableascanbeseenfromthechangeofBDOC／DOCratiofram028to06Consequentlyanadditional35％ofTOCremora】wasachievedastheozonatedwaterpassedthroughtheBACfilterwhileUV2HkeptunchangedThis

9、impliesthatthechangeinthenatureoforganicsubstancesfromUVsensitivetoUVinsensitivejsanindicationoftheimprovementintheirbiodegradabilityTheaverageToeofthetreatedwaterwasabout5mg，LThetop50cmoftheGACbiofilterplaysthemainroleo

10、fbiodegradationduetotiaeabundantbiomasstheleUriderdifferentfiltrationratefrom4m／hto10mmtherewasnodifferenceinthepercentorganicremoval，indicatingthestabilityoftheBACfilterinperformingbiologicaldegradationoforganicmattersH