PCB IN A RIVER SYSTEM DURING SEDIMENT REMEDIATION

    loading  Checking for direct PDF access through Ovid

Abstract

Remediation of 150 000 m3 of sediment containing 400 kg PCB was performed by suction dredging in a small lake in Sweden in the summers of 1993 and 1994. Upon project completion calculations indicated that 97% of the PCB was deposited in a landfill with subsequent low transport to the surroundings, and that 2.9 kg was left in the lake sediment. Concentrations of PCB that were measured weekly in the water leaving the lake were 12 ng/L (geometric mean) during dredging, not exceeding 30 ng/L and not significantly higher than in investigations preceeding the remedial action. The concentration of PCB was negatively correlated to water discharge and positively correlated to water temperature. PCB transport in the river was correlated to water discharge but not to the dredging activity. During dredging of the most contaminated part of the lake, the dredging area was screened off by a geotextile silt curtain that reduced leakage of PCB to the river downstream.

Related Topics

    loading  Loading Related Articles