微污染水源中溶解性有机氮组成规律及其水处理特性

中国环境科学2014,34(1)：130~135ChinaEnvironmentalScience微污染水源中溶解性有机氮组成规律及其水处理特性朱文倩,徐斌*,林琳,陈英英,徐倩(同济大学,污染控制与资源化研究国家重点实验室,长江水环境教育部重点实验室,上海200092)摘要：以上海市黄浦江和青草沙长江原水为对象,研究了两大水源水中溶解性有机氮(DON)的含量变化、分子组成特征及其在常规净水工艺中的去除效果,并对DON与常规水处理指标间的相关性进行了分析.结果表明:两种原水以DOC、DON和UV254表征的有机物含量均以小分子量(<5kDa)和亲水性有机物为主;微污染黄浦江原水中同时存在外源性及内源性污染,而青草沙长江原水中内源性污染占主导地位;饮用水常规净水处理工艺对黄浦江原水中DON的去除率为40%,优于长江原水DON的去除率16.7%;黄浦江和长江原水DON浓度与DOC和UV254相关性良好,其相关系数分别为0.59,0.52和0.74,0.51;鉴于常规处理对DON去除效果有限,而DON是导致强三致特性含氮消毒副产物(N-DBPs)的总前体物,因此水厂应通过强化常规、深度处理等手段改善DON在净水工艺中的去除效果.关键词：微污染原水；溶解性有机氮；分子质量分布；亲疏水性；常规净水工艺；相关性中图分类号：X131.2文献标识码：A文章编号：1000-6923(2014)01-0130-06Studiesondissolvedorganicnitrogencompositionsandwater-treatmentbehaviorinmicro-pollutedwater.ZHUWen-qian,XUBin*,LINLin,CHENYing-ying,XUQian(KeyLaboratoryofYangtzeWaterEnvironment,MinistryofEducation,StateKeyLaboratoryofPollutionControlandResourceReuse,TongjiUniversity,Shanghai200092,China).ChinaEnvironmentalScience,2014,34(1)：130~135Abstract：Dissolvedorganicnitrogen(DON)wasthemainprecursorsoftoxicN-DBPs,andtheremovaleffectofDONwasunknownforconventionalwatertreatmentprocess(CWTP).VariationofexistenceandmolecularcompositionofDONinHuangpuRiverandtheYangtzeRiverandtheremovaleffectinCWTPwasinvestigated.Theresultsshowedthatthesmallmolecular(<5kDa)andhydrophilicorganicmattersdominatedthecompositionofDON,DOCandUV254inbothtwokindsofrawwater.InHuangpuRiver,bothautochthonousandallochthonousNOMsourceswerefound.However,theautochthonoussourcesdominatedNOMsourcesintheYangtzeRiver.AstheresultoflinearregressionanalysisofDONandregularwaterindexes,DONwasmoderatelycorrelatedtoDOCwithcoefficientof0.59inHuangpuRiverand0.52inYangtzeRiver.DONwasalsocorrelatedtoUV254withcoefficientof0.74and0.51respectively.TheDONremovalratebyCWTPintheHuangpuRiver(40.0%)washigherthanYangtzeRiver(16.7%).ThegreatlimitationofDONremovalbyCWTPindicatedthatthetechnologyofenhancedconventionalandadvancedwatertreatmentmustbeappliedbythedrinkingwaterplants.Keywords：micro-pollutedwater；dissolvedorganicnitrogen；molecularweig