摘要
水资源的日益短缺是当今世界的主要难题,这一问题在很大程度上限制了人类社会的可持续发展,因此在注重节约用水的同时,加大对污染水的治理至关重要。随着工业的发展,污水成分逐渐复杂,传统的工艺已不能满足去除此类污染物的需求,尤其是重金属污染、石油污染等。人工湿地最为一种原位污水净化系统,有投资小、能耗低等优点。大量研究表明湿地系统对重金属工业废水的去除有较好的作用。人工湿地系统通过基质、植物、微生物对重金属进行去除。该文研究5种由水平潜流、垂直潜流、表面流3种不同工艺组合成的复合人工湿地系统对Cd、Cr、Cu、Pb、Zn的去除效果。结果表明:系列1~系列4复合型人工湿地对5中重金属都有去除效果。系列5除对Cu和Zn有显著释放现象外对Cd、Cr、Pb也有一定的去除效果。垂直潜流人工湿地对Cd、Cr、Pb的去除效果好于水平潜流和表面流人工湿地;多级复合型人工湿地对Cd、Cr、Pb的去除效果好于单级人工湿地;垂直潜流和水平潜流人工湿地对Cu的去除差异不大,垂直潜流人工湿地对Zn的去除效果优于水平潜流人工湿地。通过本研究结果,针对不同种类的重金属污染可对人工湿地系统的建设提供理论指导。
Growing shortage of water resources is a major problem in today's world,The problem restricts the sustainable development of human society.So pay attention to save water and increase the pollution of water is equally important.Gradually with the development of the industry,the composition of sewage is more complexed,especially heavy metal pollution,oil pollution,etc.Constructed wetland is most a kind of in-situ wastewater purification system,with small investment,low energy consumption advantages.A large number of studies have shown that the wetland system has a good effect to industrial wastewater removal of heavy metals.Constructed wetlands can remove the heavy metals through the matrix,plants and microorganisms.This paper studies five composite constructed wetland removal effect of CD,Cr,Cu,Pb,Zn by horizontal subsurface flow,vertical flow,surface flow combined.The results shows:There are certain effect on Cd,Cr,Cu,Pb,Zn removel by the series 1~4 compound constructed l wetland.Series 5 can remove Cu and Zn significantly,besides,it also can remove some Cd,Cr and Pb.he effect of vertical undercurrent of constructed wetland on Cd,Cr,Pb removal is better than horizontal undercurrent and surface flow constructed wetland;the effect of multistage compound constructed wetland on Cd,Cr,Pb removalis better than single stage constructed wetland;Horizontal and vertical undercurrent constructed wetland have similar removal effects on Cu.Vertical undercurrent of constructed wetland is better than horizontal undercurrent constructed wetland on the Zn remove.Through this study,in view of the different kinds of heavy metal pollution can provide theory guide for the construction of constructed wetland system.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2017年第S1期230-236,共7页
Environmental Science & Technology
基金
陕西省重点科技创新团队计划项目(2016KCT-23)
关键词
人工湿地
重金属
基质
植物
constructed wetland
heay wetals
matrix
plant
