Characteristics and Influencing Factors of Phosphorus Adsorption on Surface Sediments of Small Shallow Lake

LI Songgui; XIANG Sulin; ZHANG Xu; FU Chenggang; WU Bei

doi:10.13961/j.cnki.stbctb.2018.06.010

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Characteristics and Influencing Factors of Phosphorus Adsorption on Surface Sediments of Small Shallow Lake

- Characteristics and Influencing Factors of Phosphorus Adsorption on Surface Sediments of Small Shallow Lake
- Bulletin of Soiland Water Conservation Vol. 38, Issue 6, Pages: 61-66(2018)
- 作者机构：
  
  华东交通大学土木建筑学院,江西,南昌,330013
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2018.06.010
  CLC：
- Published：2018
- 稿件说明：
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LI Songgui, XIANG Sulin, ZHANG Xu, et al. Characteristics and Influencing Factors of Phosphorus Adsorption on Surface Sediments of Small Shallow Lake[J]. Bulletin of Soiland Water Conservation, 2018, 38(6): 61-66.
DOI：

LI Songgui, XIANG Sulin, ZHANG Xu, et al. Characteristics and Influencing Factors of Phosphorus Adsorption on Surface Sediments of Small Shallow Lake[J]. Bulletin of Soiland Water Conservation, 2018, 38(6): 61-66. DOI： 10.13961/j.cnki.stbctb.2018.06.010.

摘要

[目的] 分析城市小型浅水湖泊表层沉积物对磷的吸附特征及影响因素，为城市小型浅水湖泊富营养化控制和生态环境修复提供参考依据。[方法] 在室内模拟条件下，从表层沉积物对磷的吸附动力学与等温吸附两个角度分析了孔目湖表层沉积物对磷的吸附特征，同时运用磷吸附量计算公式探讨不同pH值下孔目湖表层沉积物对磷吸附行为的影响。[结果] 表层沉积物对磷的吸附动力学过程分为快吸附和慢吸附2个阶段，快吸附阶段主要发生在0~1 h内，而慢吸附阶段主要发生在1~3 h；表层沉积物对磷的吸附等温线在高浓度下同时符合Langmuir模型、Freundlich模型和D-R模型，而在低浓度下符合Linear模型；在酸性或中性环境条件下，表层沉积物对磷的吸附效果更好。[结论] 富营养化严重的小型浅水湖泊，表层沉积物有向上覆水释放磷的趋势，且上覆水和沉积物中磷酸盐含量的多少均会影响表层沉积物对磷的吸附特征和动态平衡状态的变化。

Abstract

[Objective] The objective of this paper was to analyze the characteristics and influencing factors of phosphorus adsorption on surface sediment of small shallow lake

and provide decision basis for eutrophication control and ecological environment restoration of small shallow lake.[Methods] Adsorption characteristics of phosphorus on surface sediments samples taken from Kongmu Lake was determined by adsorption kinetics and isothermal adsorption

and the adsorption behavior of phosphorus at different pH values was determined by calculation formula of phosphorus adsorption capacity.[Results] Adsorption kinetics of phosphorus on the surface sediments was divided into two stage:the rapid adsorption stage occurred in 0~1 h

while the slow adsorption stage occurred in 1~3 h. Adsorption isotherm curves was fitted into Langmuir model

Freundlich model and D-R model under high concentration conditions

while fitted into Linear equation under low concentration conditions. Under acidic or neutral environmental conditions

surface sediments has better phosphorus adsorption effect.[Conclusion] The surface sediments from small

eutrophic shallow lake has the trend to release phosphorus into the overlying water. The amount of phosphate in overlying water and sediments will affect the adsorption characteristics and dynamic equilibrium of phosphorus in surface sediments.

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