Biodegradation of Monoethanolamine,Ethylene Glycol and Triethylene Glycol in Laboratory Bioreactors |
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| Authors: | Mrklas Ole Chu Angus Lunn Stuart Bentley Laurence R |
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| Institution: | (1) Department of Geology and Geophysics, University of Calgary, 2500 University Drive NW, Calgary, AB, T4N 1N4, Canada;(2) Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB, T4N 1N4, Canada;(3) Imperial Oil Resources, 237 Fourth Avenue SW, Calgary, AB, T2P 0H6, Canada |
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| Abstract: | The release of alkanolamines and glycols into the subsurface soils poses a potential hazard to the environment through impacted soil and groundwater. This study investigated aerobic and anaerobic biodegradability of monoethanolamine (MEA), ethylene glycol (MEG) and triethylene glycol (TEG). Significant levels of MEA (31 000 mg/kg), MEG (500 mg/kg) and TEG (2100 mg/kg) were successfully aerobically biodegraded in bioreactors. The aerobic slurry experiments suggested initial phosphate (P) limitation, as biodegradation rates increased by one order of magnitude after phosphate addition. Anaerobic decay of MEA, MEG and TEG was unaffected by P-addition. MEA, MEG and TEG degradation products such as acetate, ethanol and ammonium at about 75 000 mg/kg, 8100 mg/kg and 8800 mg/kg degraded completely and did not prevent aerobic biodegradation. This study confirms proposed biodegradation pathways of MEA, MEG, TEG and their breakdown products in natural soil and groundwater using indigenous microbes. Levels of contamination studied here are significantly higher than previously reported. |
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| Keywords: | biodegradation contamination degradation products ethanolamine glycol groundwater subsurface |
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