人工湿地填料吸附氮磷性能研究

人工湿地中,基质是将污水转变成清水,以及水生植物和微生物赖以生存的场所,也是有机污染物转为无机无毒物质的枢纽,其组成直接关系到水力负荷大小、水流流速和占地面积等因素,因此,很有必要对基质的组成加以深入地研究.笔者对不同填料(火山渣和砂子)的吸附行为作了对比实验,Langmuir等温方程和Freundlich等温方程都能拟合实验所得吸附数据:填料对含磷溶液的吸附过程中,火山渣最大吸附容量达到0.04,砂子为0.034;填料对含氮溶液的吸附过程中,火山渣最大吸附容量达到0.387,砂子仅为0.004.结果表明,火山渣具有良好的表面活性和孔隙结构,与表面光滑的砂子相比,火山渣具有更强的吸附效果.

The Performance Study on Adsorption of The Filled Material in Constructed Wetland

In the constructed wetland,substrate is the location where wastewater is changed to clearwater and lived by aquatic plant and microbe,and the junction where organic contaminant is changed to inorganic and innocuous matter,the composition is related to the magnitude of hydraulic load,current velocity and floor area.There for,it is necessary for the composition of substrate of study deeply.This subject of experiment is mainly about the adsorption of media(volcanic cinder and sands) compared with another one.The Langmuir Isotherm Model and Freundlich Isotherm Model could describe the experiment data:By the process of phosphorus adsorpted by media,the maximum sorption capacity of volcanic cinder was up to 0.04mg/g,and the sands was up to 0.034mg/g;By the process of nitrogen adsorpted by media,the maximum sorption capacity of volcanic cinder was up to 0.387mg/g,and the sands was up to 0.004mg/g;The results showed that scoria with better surface activity and porosity have superior adsorption effect compared with the sands with smooth surface.