人工湿地基质对氮磷的吸附特性研究

The Characteristic of Nitrogen and Phosphorus Adsorption on two Substrates Used in Constructed Wetland

选取火山石和红砖屑作为人工湿地基质研究其氮磷吸附特性。结果表明,Langmuir方程和Freundlich方程都能很好的拟合两种基质的磷素和氮素吸附数据。基质对含磷溶液的吸附过程中,火山石最大吸附容量达到2.0000mg/g,红砖屑为3.1818mg/g;在基质对含氮溶液的吸附过程中,火山石最大吸附容量达到0.5435mg/g,红砖屑为0.3016mg/g。两种基质对磷素的吸附能力远大于对氮素的吸附,火山石和红砖屑对氮素的最大吸附量仅占其各自对磷素最大吸附量的27%和9.4%。

Adsorption characteristic of nitrogen and phosphorus in substrate of a constructed wetland were studied with selected vesuvianite and red brick crumbs. The results showed that the adsorption of phosphorus and nitrogen in the substrates could be fitted through Langmuir and Freundlich equation well. By the process of phosphorus adsorpted by the substrate, the maximum sorption capacity of vesuvianite was up to 2.0000 mg/g, and the red brick crumbs was up to 3.1818 mg/g. similarly, by the process of nitrogen adsorpted by the substrate, the maximum sorption capacity of vesuvianite was up to 0.5435 mg/g, and the red brick crumbs was up to 0.3016 mg/g. The adsorption ability of phosphorus by the media was higher than that of nitrogen, and the amount of nitrogen matrix adsorption by the substrates was only accounted for 27% and 9.4% of its phosphorus matrix adsorption respectively.