SPATIAL AND TEMPORAL BEHAVIOR OF PB, CD, AND ZN RELEASE DURING SHORT TERM LOW INTENSITY RESUSPENSION EVENTS
DOI:
https://doi.org/10.11113/jt.v80.9748Keywords:
Heavy metal contaminated sediment, resuspension, Pb, Cd and Zn release, spatial and temporal releaseAbstract
Sediment as the largest storage and resources of heavy metal plays an important role in the metal remobilisation and release. Continuous particulate matter in suspension increased the level and mobility of metals, of which poses a serious problem particularly to aquatic organisms. The purpose of this research is to investigate the fate and amount of contaminant released through sediment resuspension by using particle entrainment simulator (PES) with low turbulence intensity. The heavy metal release from sediment mixture of sand/silt/clay with percentage of 90/5/5, respectively was studied. In particular, the research paid attention to the contaminant release at the early resuspension stage (i.e. within 3 hr resuspension) by reviewing the metal releases of Zn, Cd and Pb in water column at five elevations from the bed of PES. Results showed that the concentration of remobilised heavy metal during resuspension event for Cd, Zn and Pb was in ranged of 0.034 to 0.139 mg/L, 0.014 to 0.071 mg/L and 0.007 to 0.029 mg/L respectively. The affinities of heavy metal release discussed in this study was Cd > Zn > Pb. Concentrations of the heavy metal fluctuated within the water column and have the lowest values at near bed. The highest concentration observed for Cd and Zn was at one integral length scale from the sediment bed and at t = 120 mins. Even at low turbulence intensity, the heavy metal release was still observed and is significant to the water quality.
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