Effects of Sediment Concentration and Initial Phosphorus Loading on Phosphate Adsorption in the Chongqing Reach of the Yangtze River
Publication: Journal of Environmental Engineering
Volume 134, Issue 7
Abstract
The results are presented from a laboratory and theoretical study to investigate the effects of sediment concentration and initial phosphorus loading on adsorption isotherm and capacity. The tested aquatic sediment was collected from the Chongqing reach of the Yangtze River. The adsorption isotherm of dissolved phosphate was approximated by the Langmuir equation. Using mass conservation and Langmuir adsorption kinetic equations, the authors derived formulas for calculating both the particulate and dissolved phosphate concentration. Kinetic experiments on fine sediment samples show that the adsorption process is time dependent and takes place in three stages, namely, an initial fast stage followed by a gradual adsorption, leading to the eventual equilibrium. The results indicate that larger initial phosphate loading causes longer duration, higher adsorption rate, and less adsorption percentages on both the first and second stages. The sediment concentration mainly influences the adsorption rate of the first stage, in which the adsorption rate significantly increases with the increasing sediment concentration.
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Acknowledgments
The constructive comments and suggestions made by the anonymous reviewers have significantly improved the quality of the paper.
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Published In
Journal of Environmental Engineering
Volume 134 • Issue 7 • July 2008
Pages: 585 - 589
Copyright
© 2008 ASCE.
History
Received: Mar 6, 2007
Accepted: Dec 10, 2007
Published online: Jul 1, 2008
Published in print: Jul 2008
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