Xu Defu, Xu Jianming, Wu Jianjun, Muhammad Akmal
Institute of Soil and Water Resources and Environmental Science, Zhejiang University, Hangzhou 310029, China.
Chemosphere. 2006 Apr;63(2):344-52. doi: 10.1016/j.chemosphere.2005.08.036. Epub 2005 Oct 19.
Langmuir sorption isotherm was used to screen various substrates for use in removing phosphorus (P) in constructed wetlands (CW). The nine tested substrates included four sands, two soils, bentonite, and two industrial by-products of furnace slag and fly ash. Results showed that the furnace slag had the highest P sorption capacity (8.89 g Pk g(-1)), followed was the fly ash (8.81 g P kg(-1)), and that of sand II was the lowest. Different kinds of sands also showed varying P sorption capacity (0.13-0.29 g P kg(-1)). P sorption capacity was influenced by both the physico-chemical characteristics of the substrates and the amount of organic matter (OM) added. Lifetime of sand II for P sorption estimated by Langmuir P sorption maximum was up to only 9 months in full-scale systems, while that of furnace slag could be used for up to 22 yr. Furnace slag has great potential as a CW substrate, due to its high P sorption capacity. The expected lifetime of constructed wetlands for P removal is strongly influenced by the choice of adsorbing substrate.
采用朗缪尔吸附等温线筛选用于人工湿地（CW）除磷的各种基质。所测试的九种基质包括四种沙子、两种土壤、膨润土以及两种工业副产品炉渣和粉煤灰。结果表明，炉渣的磷吸附容量最高（8.89 g P kg⁻¹），其次是粉煤灰（8.81 g P kg⁻¹），而沙子II的吸附容量最低。不同种类的沙子也表现出不同的磷吸附容量（0.13 - 0.29 g P kg⁻¹）。磷吸附容量受基质的物理化学特性和添加的有机物质（OM）量的影响。通过朗缪尔最大磷吸附量估算，在全尺寸系统中沙子II的磷吸附寿命仅达9个月，而炉渣可达22年。由于其高磷吸附容量，炉渣作为人工湿地基质具有巨大潜力。人工湿地除磷的预期寿命受吸附基质选择的强烈影响。
