The Characteristics of Particles Behavior in Wetland during Dry DaysReport as inadecuate

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Samples were collected from the 7.8 k·m2 wetland in Gimje City, Korea and analyzed for their particle size distribution and particle removal efficiency on dry days. The monitoring and surveying was conducted from July 9, 2009 to September 5, 2009, with samples immediately analyzed using a particle analyzer. The results indicated that particles were finer in the outflow than the inflow due to sedimentation of the coarse particles and resuspension of the fine particles in the wetland on dry days, and that the particle size distribution was, to a certain extent, affected by the flow rate. Particles in different size ranges play different roles in their contribution to turbidity and total suspended solids TSS. Generally, turbidity was mainly related to particles less than 10 μm in size and TSS to particles coarser than 4 μm, which accounted for only a small number fraction, which was in agreement with the volume fraction. The particles in the wetland indicated a seasonal characteristic, with particle concentrations showing a peak in summer. There was a turning point for the removal efficiency of particles less than 30 μm, which lay within the range of 2~4 μm, i.e. the colloids limit value. The removal efficiency based on the particle number was affected by resuspension, adsorption and release into the wetland. The removal efficiencies of turbidity, TSS and particles in the wetland were related to antecedent dry days ADD. ADD also affected the particle size distribution and uniformity coefficients.


Wetland; Surface water; Particle size distribution; Removal efficiency; ADD

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Author: Jianghua Yu, Yeosonk Kim, Bongyun Han, Youngchul Kim, Qitao Yi, Kisoo Park



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