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FIELD DEMONSTRATION OF PROPANE BIOSPARGING FOR IN SITU REMEDIATION OF N-NITROSODIMETHYLAMINE (NDMA) IN GROUNDWATER
Hatzinger, P.B. and D. Lippincott.
ESTCP Project ER-200828, 205 pp, 2015
Propane gas and oxygen were added to groundwater via sparging to stimulate native microbes to biodegrade NDMA in situ at the Aerojet Superfund site in Rancho Cordova, Calif. Groundwater NDMA concentrations at the test site ranged from ~2,000 to >30,000 ng/L. The biosparging system was operated for a period of 374 days, and full rounds of sampling were conducted on 12 occasions. Data from this field test indicate that propane biosparging can be an effective approach to reduce the concentrations of NDMA in a groundwater aquifer by 3 to 4 orders of magnitude, and that concentrations in the low ng/L range can be achieved with continuous treatment. The groundwater in this region currently is captured by a groundwater extraction and treatment system, and NDMA is removed by UV irradiation. Based on a cost analysis for treatment of a shallow groundwater plume (~10-40 ft bgs) ~400 ft in width, a propane biosparge barrier was estimated to be more cost-effective for NDMA removal than pump and treat with either UV or a fluidized bed bioreactor. https://www.estcp.com/content/download/40059/384461/file/Final%20Report.V1%20ER-200828%20January%202016.pdf
ESTCP Project ER-200828, 205 pp, 2015
Propane gas and oxygen were added to groundwater via sparging to stimulate native microbes to biodegrade NDMA in situ at the Aerojet Superfund site in Rancho Cordova, Calif. Groundwater NDMA concentrations at the test site ranged from ~2,000 to >30,000 ng/L. The biosparging system was operated for a period of 374 days, and full rounds of sampling were conducted on 12 occasions. Data from this field test indicate that propane biosparging can be an effective approach to reduce the concentrations of NDMA in a groundwater aquifer by 3 to 4 orders of magnitude, and that concentrations in the low ng/L range can be achieved with continuous treatment. The groundwater in this region currently is captured by a groundwater extraction and treatment system, and NDMA is removed by UV irradiation. Based on a cost analysis for treatment of a shallow groundwater plume (~10-40 ft bgs) ~400 ft in width, a propane biosparge barrier was estimated to be more cost-effective for NDMA removal than pump and treat with either UV or a fluidized bed bioreactor. https://www.estcp.com/content/download/40059/384461/file/Final%20Report.
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