Remobilization of Phosphorus from Sediments of Taihu Lake during Periods of Simulated Resuspension
A particle entrainment simulator was used to experimentally produce representative lake resuspension conditions and to investigate the resulting transport of phosphorus to the overlying water column. Five sediment samples were collected from Taihu Lake in China, which has experienced significant eutrophication in recent years. From these experiments, suspended particulate matter concentrations at a steady-state were calculated quantitatively as a function of shear stress. Soluble reactive phosphorus concentrations demonstrated significant differences depending on applied shears and contaminant loadings. Resuspension resulted in up to orders of magnitude higher particle-bound algal available phosphorus (AAP) concentrations in the water column. On mass‐weight basis, AAP concentrations decreased with shear stress. The same trend was observed for partition coefficients (K d). However, AAP concentrations normalized for volume increased about 19 times. This was likely a result of entrainment of larger size, lower contaminated particles at higher shears, and the redistribution of phosphorus to water column.
Document Type: Research Article
Publication date: November 1, 2013
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