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REMEDIATION OF DDT AND ITS METABOLITES IN CONTAMINATED SEDIMENT
Chattopadhyay, S. and D. Chattopadhyay.
Current Pollution Reports, Vol 1 No 4, 248-264, 2015
Sediment characteristics, positioning, and overlying water column must be considered relevant to the release and transport of DDT and its degradation products (DDTR) when evaluating appropriate remediation options. DDTR and other co-contaminants are not necessarily fixed permanently in the sediments. Changes in geochemical and physical parameters (e.g., ORP or anoxic environment, seepage, water table fluctuation) can mobilize these species. Remobilization processes can include the diffusion of DDTR into the water body due to concentration gradients, oxidation of anoxic sediments by bioturbation, or resuspension caused by flooding. DDTR can be transformed or partially degraded in sediments under appropriate environmental conditions; however, the degradation products often are as toxic and persistent as the original pesticides or chlorinated organics. The authors review five technologies that have been applied to remediate DDT-contaminated sediments: dredging, sediment washing, phytoremediation, in situ capping, and natural attenuation. http://link.springer.com/content/pdf/10.1007%2Fs40726-015-0023-z.pdf
Current Pollution Reports, Vol 1 No 4, 248-264, 2015
Sediment characteristics, positioning, and overlying water column must be considered relevant to the release and transport of DDT and its degradation products (DDTR) when evaluating appropriate remediation options. DDTR and other co-contaminants are not necessarily fixed permanently in the sediments. Changes in geochemical and physical parameters (e.g., ORP or anoxic environment, seepage, water table fluctuation) can mobilize these species. Remobilization processes can include the diffusion of DDTR into the water body due to concentration gradients, oxidation of anoxic sediments by bioturbation, or resuspension caused by flooding. DDTR can be transformed or partially degraded in sediments under appropriate environmental conditions; however, the degradation products often are as toxic and persistent as the original pesticides or chlorinated organics. The authors review five technologies that have been applied to remediate DDT-contaminated sediments: dredging, sediment washing, phytoremediation, in situ capping, and natural attenuation. http://link.springer.com/content/pdf/10.1007%2Fs40726-015-0023-z.pdf
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