生态护砌模拟河道对氮系污染物的去除特性  

Removal of Nitrogen in Simulated Rivers Embanked by Ecological Concrete

作　　者：陈杨辉[1] 吕锡武[1] 吴义锋[1] 

机构地区：[1]东南大学环境工程系,南京210096

出　　处：《环境科学》2008年第8期2172-2176,共5页Environmental Science

基　　金：国家高技术研究发展计划(863)项目(2002AA601130);江苏省科技厅社会发展项目(BS2004050)

摘　　要：分别应用生态混凝土预制球型砌块、板状砌块及4球联体砌块构建3条中试规模的模拟河道,定量研究生态护砌河道对氮系污染物的去除特性,并与'三面光'护砌模拟河道进行对比.结果表明,在自然条件下,水力停留时间2 d时,生态混凝土预制球型砌块护砌河道对黄浦江原水中NH4+-N、NO2--N、NO3--N、TN的去除率分别为83.6%、75.2%、37.1%、47.5%,生态混凝土预制板状砌块护砌河道为83.4%、53.0%、30.6%、40.4%,生态混凝土预制4球联体砌块护砌河道为88.1%、72.4%、33.0%、40.9%.在相同的条件下,'三面光'护砌河道对NH4+-N、TN的去除率分别为61.1%、9.1%,而NO2--N、NO3--N由于受到NH4+-N转化的影响,浓度产生了累积,分别增加了7.4%3、.4%.护砌方式对水中氮系污染物的去除影响显著,生态护砌方式可在短期内有效去除水中氮系污染物,故可作为河流等地表水体水质净化与修复的重要措施.护砌结构孔隙率和植被覆盖率的提高有利于生态护砌河道对氮系污染物的去除.The removal of nitrogen was studied in four types of pilot-scale rivers.The embankment for rivers No.1,2 and 3 consisted of respectively spheriform ecological-concrete prefab-bricks,rectangular ecological-concrete prefab-bricks and square ecological-concrete prefab-bricks with 4 hemispheroids.The embankment for river No.4 was made of concrete C25.The results show that the removal rates of NH4^＋-N,NO2^--N,NO3^--N and TN of river 1 are 83.6%, 75.2%,37.1% and 47.5% under hydraulic retention time of 2 days,83.4%,53.0%,30.6% and 40.4% for river 2,88.1%,72.4%,33.0% and 40.9% for river 3.Under the same condition, NH4^＋-N,TN of river 4 decreases by 61.1%,9.1%,while NO2^--N,NO3^--N increase by 7.4%,3.4% due to the transformation of NH4^＋-N.It indicates that ecological embankment rivers can effectively remove nitrogen.Besides,the addition of pore rate in embankment structure and more rate of plant coverage are good for the removal of nitrogen in ecological embankment rivers.

关 键 词：生态护砌 “三面光”护砌 生态混凝土 模拟河道 氮系污染物 去除特性 

分 类 号：X171.4[环境科学与工程—环境科学]