五里湖和贡湖不同粒径沉积物吸附磷实验研究

Study on the Phosphate Sorption of the Different Particle Size Fractions in the Sediments from Wuli Lake and Gonghu Lake

通过研究五里湖和贡湖不同粒径沉积物对磷的吸附动力学曲线和吸附等温曲线,分析了不同粒径沉积物氮、磷和有机质含量以及化学组成等理化特征对其吸附磷的影响,初步得出如下结论:五里湖和贡湖不同粒径沉积物对磷的吸附动力学曲线和吸附等温曲线具有相似的变化趋势;贡湖沉积物每一粒级的吸附量、吸附速率和吸附效率均高于五里湖沉积物;各粒级的变化趋势均为粘粒级>细砂粒级>粗砂粒级>粉砂粒级;各粒级中粉砂粒级SiO2含量最高,可能是造成其对磷的吸附量、吸附速率和吸附效率在各粒级中最低的原因。

Sorption kinetics and isotherm curves of phosphate on the different particle sizes fractions from the Wuli Lake and Gonghu Lake sediments were determined, and the influence of the total N, total P, organic matter and chemical compositions on phosphate sorption were also analyzed. The primary conclusions were as follows. Sorption kinetics and isotherm curves of phosphate on different particle size fractions from the Wuli Lake and Gonghu Lake sediments have similar trend; the amount, rate and efficiency of sorption of phosphate on each particle size fraction from the Gonghu Lake sediment were bigger than those from the Wuli Lake sediment, and the trend of different particle sizes fractions is: clay > fine sand > coarse sand > silt; and the concentrations of SiO_2 of silt from the lake sediment were the highest among various particle sizes fractions, which may be the reason that its amount, rate and efficiency of sorption of phosphate was the lowest.