曝气和pH对城市污染河道底泥氮形态的影响  

Influence of aeration and pH on nitrogen in urban heavily polluted river sediment

作　　者：许宽[1] 刘波[1,2] 王国祥[1] 杜旭[1] 凌芬[1] 周锋[1] 

机构地区：[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

出　　处：《环境工程学报》2012年第10期3553-3558,共6页Chinese Journal of Environmental Engineering

基　　金：江苏省科技厅科技支撑计划(BE2008677;BE2011690);江苏省太湖水环境治理专项基金(TH2010303);住房和城乡建设部科技项目(2010-K7-7)

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+pH11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)。Using indoor simulation method,the nitrogen fraction was investigated under different aeration ways and initial pH of overlying-water.The surface sediment of urban river which had been heavily polluted was used as material in the study.The results showed that,under the ＂aerating to water pH11＂ condition,the removal rates of total nitrogen in overlying-water and pore-water reached 70.03% and 44.66%,respectively.However,the removal rates of ammonia that contained in overlying-water,pore-water and sediment were 94.31%、84.07% and 68.29%,respectively,when using the ＂aerating to sediments pH7＂ method.The study also indicated a positive correlation between pH of the sediment and concentration of the total nitrogen in overlying-water（p0.05）.And the moisture content and ignition loss of the sediment increased significantly under ＂aerating to sediments pH11＂ condition,the amount of ammonia maintained in the absorbed phase had a significant negative correlation with the moisture content of sediment（p0.01）,while the concentration of ammonia dissolved in pore-water had a significant positive correlation with the ignition loss of sediment（p0.01）.

关 键 词：水曝气 泥曝气 PH 底泥 氮形态 

分 类 号：X703[环境科学与工程—环境工程]