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Transport and Biodegradation of Perchlorate in Soils

University of California Davis, Department of Land, Air, and Water Resources, Davis, CA 95616

View larger version (21K): [in a new window]   Fig. 1. Measured and predicted breakthrough curves in Yolo loam Experiments 1 (a), 2 (b), and 3 (c).

View larger version (21K): [in a new window]   Fig. 2. Perchlorate degradation and Cl- formation in Yolo loam flooded batch experiments. Each point represents the mean (± standard deviation) of three replicates. Perchlorate in sterile controls was not degraded.

View larger version (20K): [in a new window]   Fig. 3. Perchlorate concentrations over time in flooded batch experiments with Columbia loam collected in 1997 and fresh Columbia loam. Each point represents the mean (± standard deviation) of three replicates. Perchlorate in sterile controls was not degraded.

View larger version (23K): [in a new window]   Fig. 4. Perchlorate concentrations over time in unamended and acetate-amended fresh Columbia loam flooded batch experiments. Each point for the unamended flasks represents an average (± standard deviation) of three replicates. Each replicate is shown separately for the flasks to which acetate was added. Perchlorate in sterile controls was not degraded.

View larger version (22K): [in a new window]   Fig. 5. Perchlorate concentrations over time in flooded batch experiments with unamended Yolo subsoil, Yolo subsoil amended with glucose, and Yolo subsoil amended with acetate. Each point represents the mean (± standard deviation) of three replicates.

View larger version (19K): [in a new window]   Fig. 6. Perchlorate concentrations over time in Yolo loam gas-sparged batch experiments. Perchlorate in sterile controls was not degraded. Each point represents the average of three replicates (± standard deviation).

View larger version (33K): [in a new window]   Fig. 7. Perchlorate concentrations over time in dredge tailings or sterilized dredge tailings amended with acetate, acetate and sterilized Yolo loam, or acetate and nonsterilized Yolo loam. Each point in represents the mean (± standard deviation) of three replicates.

View larger version (19K): [in a new window]   Fig. 8. Nitrate concentrations (a) and perchlorate concentrations (b) over time in Yolo loam N2–sparged batch experiments. Flasks were respiked with perchlorate and NO-3 on Day 15. Each point in (a) and (b) represents the average (± standard deviation) of three replicates.