Remobilization of phosphorus from sediments of Taihu Lake during periods of simulated resuspension

Author: WANG Peng, SHEN Xia, WANG Shengyan, HAO Shaopan

Source: Water Environment Research

Publisher: Water Environment Federation

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A particle entrainment simulator was used to experimentally producerepresentative lake resuspension conditions and to investigate the resulting transport ofphosphorus to the overlying water column. Five sediment samples were collected from TaihuLake in China, which has suffered serious eutrophication in recent years. From theseexperiments, suspended particulate matter concentrations at a steady-state were calculatedquantitatively as a function of shear stress. Soluble reactive phosphorus concentrationsdemonstrated significant differences depending on applied shears and contaminant loadings.Resuspension resulted in up to orders of magnitude higher particle-bound algal availablephosphorus (AAP) concentrations in the overlying water column. On mass weight basis, AAPconcentrations decreased with shear stress. The same trend was observed for partitioncoefficients (Kd). However, AAP concentrations normalized for volume increased aboutnineteen times. This was likely due to the entrainment of larger size, lower contaminatedparticles at higher shears and the redistribution of phosphorus to water column.

Keywords: sediment resuspension; phase partitioning; particle entrainment simulator;


Appeared or available online: March 5, 2013


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