Effects of sediment physical properties on the phosphorus release in aquatic environment

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• 作者：HongWei Zhu (1) (2)
  DaoZeng Wang (1)
  PengDa Cheng (1) (3)
  JingYu Fan (1)
  BaoChang Zhong (1)
  
  1. Shanghai Institute of Applied Mathematics and Mechanics ; Shanghai University ; Shanghai ; 200072 ; China
  2. Key Laboratory of Waterway Dredging Technology ; Ministry of Transport ; National Engineering Research Center of Dredging Technology and Equipment ; Shanghai ; 201208 ; China
  3. School of Mechatronic Engineering and Automation ; Shanghai University ; Shanghai ; 200072 ; China
  
• 关键词：sediments pollutants ; particle size ; porosity ; phosphorus desorption ; molecular diffusion ; 024702
• 刊名：SCIENCE CHINA Physics, Mechanics & Astronomy
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：58
• 期：2
• 页码：1-8
• 全文大小：470 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Chinese Library of Science
  Mechanics, Fluids and Thermodynamics
  Physics
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1927

文摘

Particle size, porosity, and the initial phosphorus concentration in sediments are the main factors affecting phosphorus release flux through the sediment-water interface. Sediments can be physically divided to muddy and sandy matters, and the adsorption-desorption capacity of sediment with phosphorus depends on particle size. According to phosphorus adsorption-desorption experiments, phosphorus sorption capacity of the sediment decreases with the increase of particle dimension. But among the size-similar particles, sediment with a bigger particle size has the larger initial phosphorus release rate. In terms of muddy and sandy sediments, there are inversely proportional relationships between the release rate and the flux. Due to the contact of surface sediment and the overlying water, the release flux from the sediment is either from direct desorption of surface sediment layer or from the diffusion of pore water in the sediment layer, which is mainly determined by sediment particle size and porosity. Generally, static phosphorus release process may include two stages: the first is the initial release. As for coarse particles, phosphorus is desorbed from surface sediment. And for fine particles, phosphorus concentration in water often decreases, mainly from pore water by the molecular diffusion. During the second stage, pore water flows faster in coarse sediment, and phosphorus is easy to desorb from the surface of the particles as diffusion dominates. For the smaller liquid-solid ratio of fine particles and the larger amount of phosphorus adsorption, the release flux from pore water due to diffusion is very small with longer sorption duration.