Effect of extracellular polymeric substances on the phosphorus adsorption characteristics of sediment particles |
| |
| Authors: | Huiming Zhao Yuefeng Zhang Liqun Tang Zhenghui Cui Bing Liu Wei Cheng Chuansheng Guo Dabin Liu Xiaowei Gao Haochuan Feng |
| |
| Institution: | State Key Laboratory of Simulation and Regulation of River Basin Water Cycle,China Institute of Water Resources and Hydropower Research,Beijing,100048,China;Development Research Center of the Ministry of Water Resources of PR China,Beijing,100038,China;The State Key Laboratory of Hydro Science and Engineering,Department of Hydraulic Engineering,Tsinghua University,Beijing,100084,China;Beijing Institute of Water,Beijing,100048,China |
| |
| Abstract: | Extracellular polymeric substances (EPS) have a great impact on the characteristics of sediment particles and their environmental effects in hydro-environmental systems, yet little effort has been made to study the considerable variability in the element adsorption process of sediment particles caused by EPS. Understanding the variability of the adsorption characteristics of sediment particles associated with EPS and quantifying the scale of the adsorption isotherm parameters are important for understanding how EPS mediate sediment properties and environmental factors. In this paper, isothermal equilibrium adsorption experiments are done on phosphorus to study the influence of EPS on the adsorption characteristics of sediment particles, and the Langmuir adsorption isotherm is applied to analyze the adsorption rule of sediment particles under the impact of EPS. The current research demonstrates that significant differences will take place in the adsorption characteristics of sediments coated with EPS at different development phases and the phosphorus adsorption capacity of sediment particles increases with the growth of EPS. The difference in the adsorption percentage between sediment particles coated with EPS of 0 and 6 weeks growth time is about 42%–60% for different initial aqueous phosphorus concentration. A formula describing the adsorption isotherm parameter of the maximum material (element) adsorption capacity of sediment particles change over time is further proposed based on the experimental data. The current study provides some evidence for the interaction of sediment particles, EPS, and adsorbed elements in the water environment. |
| |
| Keywords: | Sediment particles Extracellular polymeric substances (EPS) Phosphorus Langmuir adsorption isotherm |
| 本文献已被 万方数据 ScienceDirect 等数据库收录！ |
|
