人工湿地基质磷吸附特性与其物理化学性质的关系

 对9种垂直流人工湿地基质进行了对磷的等温吸附试验.结果表明,在溶液磷浓度为100～500mg/L条件下,9种基质中以草炭的吸附量为最高,达到2439.56mg/kg;砾石的吸附量最低,仅为188.67mg/kg;其余基质表现出高炉渣土>高炉渣>煤灰渣土>耕层土>煤灰渣>中粗砂土>中粗砂的规律.供试基质的容重和密度与磷吸附量呈极显著性负相关关系;基质的颗粒直径D₈₀和不均匀系数K₈₀与磷吸附量呈显著性正相关关系.基质的CEC、有机质、有效Fe和交换性Al的含量与磷吸附量呈极显著性正相关关系;pH值与磷吸附量呈极显著性负相关关系.

The relationship between constructed wetland substrate phosphorous adsorption character and its physico-chemical properties

The isothermal adsorption test was carried out in 9 kinds of vertical-flow constructed wetland substrates under the condition of 100~500mg/L of solution P concentration. Adsorptive amount of grass carbon in these substrates was the highest, reaching 2439.56mg/kg, the lowest was that of gravel, only 188.67mg/kg; the rest of substrates expressed the rule of slag soil of furnace>slag of furnace> slag soil of coal burn >collimated layer soil>coal burn slag>sand soil of mid-sized >mid-sized sand. The volumetric gravity and the specific gravity of the supplied substrates had very marked negative correlation with the amount of phosphate adsorption, but the particle diameter (D80) and uniformity coefficient (K80) showed marked positive correlation with the amount of phosphate adsorption. The contents of CEC, organic matter, effective iron and exchangeable aluminum of substrate expressed very marked positive correlation. pH value showed very significant negative correlation with the amount of phosphate adsorption.