Accelerating aerobic DRO biodegradation in stream bank sediments through oxygen enhancements: Laboratory results and field pilot demonstration
- Montana State Univ., Bozeman, MT (United States)
- Maxim Technologies, Missoula, MT (United States); and others
A novel technique has been developed for accomplishing in situ, aerobic bioremediation of low-temperature, low-permeability, high-organic carbon containing stream bank sediments impacted with diesel range petroleum hydrocarbons. Laboratory microcosms tests have demonstrated efficient removal of diesel range organics (DRO) when sediments are amended with oxygen-releasing and solubilizing compounds. This technique was conceived, designed and tested to provide a superior alternative to destructive and costly intrusive remediation for a fragile, pristine, riparian environment. Laboratory microcosm tests using sediments from a DRO impacted mountain stream were amended with surfactant (alcohol ethoxylate 810-4.5), a magnesium peroxide containing mixture (Oxygen Release Compound{reg_sign}, Regenesis, Inc.), hydrogen peroxide, and ethanol to determine the effects of these oxygen-enhancing and solubilizing amendments on biodegradation extent and DRO bioavailability. Laboratory test results and subsequent field toxicity testing using aquatic biota indicated the MgO, mixture to be most suitable for field use at this site. While laboratory microcosm tests showed significant reductions to both DRO and the water surface sheen associated with trapped hydrocarbons, biodegradation endpoints in the range of 500-1000 mg/kg were observed. These non-zero biotreatment endpoints suggest that biodegradation in situ is limited by DRO bioavailability. Because contaminant transport to groundwater and adjacent surface waters is very slow, exposure risk is minimal. Based on successful laboratory testing, a field pilot test was initiated in September 1996 wherein slurried Oxygen Release Compound{reg_sign} (ORC) was pressure-injected into shallow, DRO impacted stream bank sediments.
- OSTI ID:
- 569989
- Report Number(s):
- CONF-971116-; TRN: 98:000778-0051
- Resource Relation:
- Conference: 1997 petroleum hydrocarbons and organic chemicals in ground water: prevention, detection, and remediation conference, Houston, TX (United States), 12-14 Nov 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the 1997 petroleum hydrocarbons & organic chemicals in ground water: Prevention, detection, and remediation; PB: 811 p.
- Country of Publication:
- United States
- Language:
- English
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