生态混凝土护砌模拟改善水源地水质  

Purification of source water quality in simulated rivers embanked by ecological concrete

作　　者：贾永志[1,2] 吕锡武[1] 吴义锋[1] 

机构地区：[1]东南大学能源与环境学院,南京210096 [2]江苏省水利厅,南京210029

出　　处：《东南大学学报（自然科学版）》2009年第4期844-848,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)重大专项资助项目(2002AA601130);江苏省水利科技资助项目(2006034)

摘　　要：通过构建中试规模的生态混凝土预制砌块护砌的河流生态修复实验模型,采用生态混凝土预制球、具孔矩形砌块及4球连体砌块分别护砌开挖的1#,2#,3#河道,并以模拟传统"三面光"护砌的4#河道为实验对照,在可控条件下研究河流生态护砌方式的水质净化及生态效应.实验结果表明:以黄浦江水为研究对象,生态护砌河道(1#,2#,3#)在河流生态系统基本建立的条件下,水力停留时间(HRT)为2d时,生态护砌河道对CODM n,NH3-N,TN的平均去除率分别超过15%,70%,50%,河水浊度均迅速降低至5.0NTU以下;实验河道生态护砌面基质中微生物量、TTC-脱氢酶活性以及坡面植被覆盖率和生长状况良好,水质改善效果明显.模拟硬质护砌的实验河道HRT为2d时,对CODM n,NH3-N,TN的去除率分别为7.4%,25.7%,7.2%,河水浊度改善不明显.Pilot-scale rivers were constructed to simulate water quality improvement and ecological restoration of rivers embanked by ecological concrete （ i. e. eco-concrete）, the experimental group including rivers 1, 2 and 3 which were embanked by spheriform eco-concrete prefab-bricks, rectangular eco-concrete prefab-bricks and square eco-concrete prefab-bricks with four hemispheroids, respectively, while river 4 was embanked by traditional concrete as a contrastive group. Water purification and ecological effects of different embanked rivers were studied under controlled conditions. The source water was piped from Huangpu River, being taken as the research object. Under the hydraulic retention time of 2 d, the results show that the average removal rates of CODMn, NH3-N, TN of rivers 1, 2 and 3 are 15%, 70% and 50%, respectively, and the turbidity rapidly decreases to lower than 5.0 NTU; biomass and TTC-dehydrogenase activity and aquatic plants with ecological embankment are all in good condition and make positive effects on ecological restoration, therefore the water quality is significantly improved. On the contrary, the removal rates of CODMn, NH3-N, TN with hard embankment in river 4 are only 7.4%, 25.7% and 7.2% respectively, the turbidity has no obvious improvement.

关 键 词：生态护砌 硬质护砌 水质改善 生态混凝土 

分 类 号：X5[环境科学与工程—环境工程]