焦化废水生化处理后有机物的臭氧氧化降解与转化_郑俊
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2020-01-26 17:52:01
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焦化废水生化处理后有机物的臭氧氧化降解与转化郑俊1,2,毛异1,宁靓2,程晓玲2(1.安徽工业大学建筑工程学院,安徽马鞍山243002;2.马鞍山市华骐环保科技发展有限公司,安徽马鞍山243051)摘要:采用臭氧氧化法处理经生化处理后的焦化废水,研究了对废水中COD、NH3-N和色度的去除效果,并通过气相色谱/质谱分析了有机物在反应过程中的降解与转化情况。结果表明:在气水接触90min时,整个系统对COD、NH3-N和色度的去除率分别达到30.3%、21.9%和64.5%。经生化处理后焦化废水的有机组分主要为芳香烃、长链烷烃、杂环化合物、邻苯二甲酸酯类难降解有机物;经臭氧氧化后,大部分难降解有机物被完全去除,一部分被分解生成了一些中间产物和衍生物,如酰氯、酮类、醇类等易降解有机物,可生化性大大提高。因此,用臭氧氧化处理经生化处理后的焦化废水,后续接一级生化处理,有望使出水水质达到《污水综合排放标准》(GB8978—1996)的一级标准。关键词:臭氧;生化后焦化废水;有机物降解;质谱分析中图分类号:X784文献标识码:C文章编号:1000-4602(2011)21-0072-04DegradationandTransformationofOrganicsinBiochemicalyPretreatedCokingWastewaterbyOzonationZHENGJun1,2,MAOYi1,NINGLiang2,CHENGXiao-ling2(1.SchoolofArchitecturalEngineering,AnhuiUniversityofTechnology,Ma’anshan243002,China;2.HuaqiEnvironmentProtectionScienceandTechnologyDevelopmentCo.Ltd.,Ma’anshan243051,China)Abstract:Ozonationprocesswasappliedforthetreatmentofcokingwastewaterwhichwaspretrea-tedbybiochemicalprocess.TheremovaleffectsofCOD,ammonianitrogenandcolorwerestudied,andthedegradationandtransformationoforganicsduringozonationwereanalyzedbygaschromatography/massspectrum(GC/MS).Theresultsindicatethatwhenthecontacttimebetweenozoneandwastewateris90min,theremovalratesofCOD,ammonianitrogenandcolorare30.3%,21.9%and64.5%re-spectively.Themainorganicsofcokingwastewaterpretreatedbybiochemistryaresomerefractorycom-pounds,suchasaromatichydrocarbons,long-chainalkanes,heterocycliccompounds,phthalicacides-tersandsoon.Afterozonation,themajorityofrefractorycompoundsaredegradedabsolutely,someofwhicharetransformedintointermediatesandderivativesthatareeasytodegraded,suchasacylchloride,ketonesandalcohols,whichgreatlyimprovesthebiodegradabilityofthecokingwastewater.Therefore,itispromisingforcokingwastewatertoattainthefirstclasscriteriaspecifiedintheIntegratedWastewaterDischargeStandard(GB8978-1996)byusingbiochemicalpretreatmentandozonationfollowedbypri-marybiochemicaltreatment.Keywords:ozone;cokingwastewaterpretreatedbybiochemicalprocess;degradationofor-ganics;massspectrum·27·第27卷第21期2011年11月中国给水排水C
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