Innovative In-Situ Remediation of Contaminated Sediments for Simultaneous Control of Contamination and Erosion. Annual Report 2007.

Knox, A. S. ; Reible, D. D. ; Paller, M. H. ; Petrisor, I. G.

Technical Information Center Oak Ridge Tennessee

关键词: Sediments;    Erosion control;    Contamination;    Remedial action;    In-situ processing;   

RP-ID  :  DE2008921682

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Current technologies for remediating contaminated sediments offer only temporary solutions, do not address mixtures of organic and inorganic contaminants, and may not be effective in both marine and freshwater environments. New technologies are needed that neutralize contaminant toxicity and control physical transport mechanisms that mobilize sediment contaminants. The last 12 months of this comprehensive project investigated the use of combinations of sequestering agents to develop in situ active sediment caps that stabilize mixtures of contaminants and act as a barrier to mechanical disturbance under a broad range of environmental conditions. Efforts focused on the selection of effective sequestering agents for use in active caps, the composition of active caps, and the effects of active cap components on contaminant bioavailability and retention. Results from this project showed that phosphate amendments, some organoclays, and the biopolymer, chitosan, were very effective at removing metals from both fresh and salt water. These amendments also exhibited high retention (80% or more) of most metals indicating reduced potential for remobilization to the water column. Experiments on metal speciation and retention in contaminated sediment showed that apatite and organoclay can immobilize a broad range of metals under both reduced and oxidized conditions.