Innovative In-Situ Remediation of Contaminated Sediments for Simultaneous Control of Contamination and Erosion. Part 2
SAVANNAH RIVER NATIONAL LAB AIKEN SC
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Multiple amendment active caps MAACs developed under this project for the remediation of contaminated sediments consist of a mixture of chemically active amendments combined with sand or other neutral materials such as clay or clean soilsediment. The objectives of SERDP project ER-1501 part II were 1 the development and evaluation of MAAC technology for sorption and desorption of contaminants, 2 prediction of contaminant release over time from MAAC formulations by numerical modeling, 3 evaluation of MAAC resistance to erosion, and 4 assessment of MAAC toxicity to aquatic organisms. Laboratory evaluations of sorption and desorption capacities and calculation of partition coefficient Kd values showed that mixing of apatite with organoclay reduced the sorption capacity and effective retardation factor for organics compared to pure organoclay, but the reductions were small. However, for metals the results from the sorption and desorption studies showed that mixtures were more effective than individual amendments for several tested elements including As, Cd, Co, Ni, and Zn.
- Solid Wastes and Pollution and Control