植被过滤带的污染物去除效率研究进展

摘要

This paper analyzes the experimental data in the literature and summarizes the quantitative calculation VFS removal efficiency of the experience,physical model.The experimental results show that there is a certain correlation between the VFS length and the removal efficiency.The slope change has no significant effect on the removal efficiency,and the organic carbon adsorption coefficient of the pesticide has a great influence on its removal.At present,the empirical model of VFS removal efficiency can estimate the removal efficiency of pollutants by the length of VFS,calculate the removal efficiency according to the composition of sediment,and can also calculate the contribution of infiltration and adsorption for nitrogen,phosphorus and pesticide removing from VFS.The mechanism of VFS removal of contaminants is well understood,and the physical model based on the removal mechanism is gradually being refined.VFSMOD is one of the representatives.In the future,there is a need to strengthen the VFS quantitative study of other non-point source pollutants such as colloids,nanoparticle studies,and VFS's effect on pollutant removal at basin scale.%探讨植被过滤带(vegetative filter strips,VFS)污染物去除效率与VFS特征参数(长度、坡度、植被类型)、污染物特性之间的关系,归纳了计算VFS污染物去除效率的经验模型和物理模型.结果表明,VFS长度与污染物去除效率呈一定的相关关系,坡度改变对污染物去除效率无明显影响,农药的有机碳吸附系数对污染物去除效率有较大的影响;VFS去除效率经验模型可以依据VFS的长度来估算污染物质的去除效率,同时可以计算不同粒径泥沙的去除效率,针对氮、磷、农药也能估算不同去除方式(如下渗、吸附等过程)的贡献率;耦合了水文模型与污染物去除机制的物理模型也在逐步完善中,VFSMOD就是代表.未来需要加强VFS对其他面源污染物如胶体、纳米颗粒物去除效率的研究,关注VFS在流域尺度上的污染物去除效率.