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时间:2020-04-20
《曝气和pH对城市污染河道底泥氮形态的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第6卷第1O期环境工程学报Vo1.6.No.1020l2年10月ChineseJourna1ofEnvironmentalEngineerin0ct.2012曝气和pH对城市污染河道底泥氮形态的影响许宽刘波王国祥杜旭凌芬周锋(1.南京师范大学地理科学学院,南京210046;2.南通大学地理科学学院,南通226000)摘要以城市重污染河道表层沉积物为研究对象,采用模拟实验方法,探讨了不同曝气方式(水曝气和泥曝气)、上覆水初始pH(自然状态pH=7和pH=11)对城市污染河道底泥氮形态的影响。结果表明:采用水曝气+pH1l方式对城市重污染河道上覆水、间隙水中总氮去除率分别为70.03%和
2、44.66%;泥曝气pH7方式对上覆水、间隙水、底泥中氨氮去除率分别为94.31%、84.07%和68.29%;底泥pH与上覆水总氮浓度呈正相关(P<0.05);泥曝气+pH11方式使底泥含水率、烧失率明显升高,继而影响各形态氮在泥水系统中的赋存,其中底泥吸附态氨氮含量与底泥含水率呈显著负相关(P<0.01),间隙水可溶态氨氮浓度与底泥烧失率显著正相关(P<0.01)。关键词水曝气泥曝气pH底泥氮形态中图分类号X703文献标识码A文章编号1673—9108(2012)10—3553—06InfluenceofaerationandPHonnitrogeninurbanheavilyp
3、ollutedriversedimentXuKuanLiuBo-WangGuoxiangDuXuLingFenZhouFeng。(1.SchoolofGeographicalScience,NanjingNormalUniversity,Nanjing210046,China;2.SchoolofGeographicalScience,NantongUniversity,Nantong226000,China)AbstractUsingindoorsimulationmethod,thenitrogenfractionwasinvestigatedunderdifierentaera
4、tionwaysandinitialpHofoverlying—water.Thesurfacesedimentofurbanriverwhichhadbeenheavilypollutedwasusedasmaterialinthestudy.Theresultsshowedthat,underthe“aeratingtowater&pH11”condition,there—moralratesoftotalnitrogeninoverlying—waterandpore—waterreached70.03%and44.66%.respectively.However,therem
5、ovalratesofammoniathatcontainedinoverlying-water,pore—waterandsedimentwere94.31%、84.07%and68.29%,respectively,whenusingthe“aeratingtosediments&pH7”method.ThestudyalsoindicatedapositivecorrelationbetweenpHofthesedimentandconcentrationofthetotalnitrogeninO·verlying-water(p<0.05).Andthemoisturecon
6、tentandignitionlossofthesedimentincreasedsignificantlyun—der“aeratingtosediments&pH11”condition.theamountofammoniamaintainedintheabsorbedphasehadasignificantnegativecorrelationwiththemoisturecontentofsediment(p<0.01),whiletheconcentrationofam-moiliadissolvedinpore-waterhadasignificantpositiveco
7、rrelationwiththeignitionlossofsediment(P<0.01).Keywordsaeratingtowater;aeratingtosediment;pH;sediment;nitrogen人工曝气技术广泛应用于城市污染河道的治统,¨,但调节上覆水pH条件下进行曝气来探讨理,对氮的去除有一定效果’。目前工程应氮的去除效果尚鲜有报道。用多为对上覆水曝气,但对于内源氮的控制并没有为了解不同曝气、pH对城市河道底泥氮形态的起到长期有
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