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扰动强化河道底泥对磷持留能力的研究

Keywords: ,扰动,底泥,城市河道

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Abstract:

以城市河道上覆水和底泥为材料,研究了扰动对底泥持留磷能力的强化作用,并分析了强化机理。结果表明,底泥扰动促进了上覆水中磷向底泥中迁移。与对照试验相比,溶解性磷酸盐(DIP)和总磷(TP)平衡浓度分别降低了73.02%和42.39%;与原底泥相比,扰动试验底泥中溶解性磷酸盐(DIP)的释放量降低了173.77mg·kg-1,对照试验底泥中DIP的释放量基本保持一致。另外,底泥扰动后,钙结合态磷(Ca-P)含量显著增加,并接近总磷的增加量;而对照试验底泥中,总磷的净增加量比较均匀地分配到弱吸附态磷(NH4Cl-P)、铁结合态磷(Fe-P)、钙结合态磷(Ca-P)中。

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