using humalite-derived humic products to mobilize soil ... · using humalite-derived humic products...
TRANSCRIPT
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Using Humalite-Derived Humic Products to Mobilize Soil-Adsorbed
Hydrocarbons and Enhance Natural Attenuation
October 15, 2004
Trenton M. Parks, Ph.D., P.Chem.Stantec Consulting Ltd.
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The Problem
• Old oil sites
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The Problem
• Old oil sites
• Light-end hydrocarbons have “gone away”
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The Problem
• Old oil sites
• Light-end hydrocarbons have “gone away”
• Heavier-end hydrocarbons are sorbed to soils
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The Problem
• Low levels of HCs in groundwater
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The Problem
• Low levels of HCs in groundwater
• High levels of HCs in soil
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The Problem
• Low levels of HCs in groundwater
• High levels of HCs in soil
• Can’t get site closure
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The Problem
• Groundwater remediation methods are ineffective
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The Problem
• Groundwater remediation methods are ineffective
• Natural attenuation is very, very slow
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The Problem
• Groundwater remediation methods are ineffective
• Natural attenuation is very, very slow
• “Dig ‘n’ Dump” has been the traditional method of dealing with the problem
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The Problem
• “Dig ‘n’ Dump” is simple
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The Problem
• “Dig ‘n’ Dump” is simple
• “Dig ‘n’ Dump” is expensive
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The Solution?
• Controlled mobilization of HCs
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The Solution?
• Controlled mobilization of HCs
• Allows ex-situ treatment of groundwater
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The Solution?
• Controlled mobilization of HCs
• Allows ex-situ treatment of groundwater
• Improves the rate of natural attenuation
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The Solution?
• Surfactants
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The Solution?
• Surfactants
• Humic products
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Humic Products
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Humic Products
• Humic acid
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Humic Products
• Humic acid
• Humate
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Humic Products
• Humic acid
• Humate
• Humalite
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Humic Products
• Naturally occurring
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Humic Products
• Naturally occurring
• Highly oxidized
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Humic Products
• Naturally occurring
• Highly oxidized
• Organic material
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Humic Products
• Naturally occurring
• Highly oxidized
• Organic material
• Found adjacent to sub-bituminous coal
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Humic Products
• “Water soluble”
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Humic Products
• “Water soluble”
• Actually colloidal
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Humic Products
• “Water soluble”
• Actually colloidal
• Particles 1 nanometer to 1 micron
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Humic Products
• Mobilizes bound HCs by providing sites for preferential adsorbance
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Humic Products
• Mobilizes bound HCs by providing sites for preferential adsorbance
• HCs are brought into “solution”
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Humic Products
• Surfactants
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Humic Products
• Surfactants
• Humics
o Naturally occurring
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Humic Products
• Surfactants
• Humics
o Naturally occurring
o Non-toxic
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Humic Products
• Surfactants
• Humics
o Naturally occurring
o Non-toxic
o Inexpensive
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Pilot Study
• Devon Canada Corporation’s Foothills #9 Battery Site
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Pilot Study
• Devon Canada Corporation’s Foothills #9 Battery Site
• Abandoned battery site
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Pilot Study
• Devon Canada Corporation’s Foothills #9 Battery Site
• Abandoned battery site
• Well drilled in 1944
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Pilot Study
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Pilot Study
• Sandy loam of glaciofluvial origin 3.0 m thick
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Pilot Study
• Sandy loam of glaciofluvial origin 3.0 m thick
• Clay till underlying
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Pilot Study
• Sandy loam of glaciofluvial origin 3.0 m thick
• Clay till underlying
• Groundwater is 2.2 to 2.9 mbgs
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Pilot Study
• Sandy loam of glaciofluvial origin 3.0 m thick
• Clay till underlying
• Groundwater is 2.2 to 2.9 mbgs
• Hydraulic conductivities of 10-5 to 10-3 m/s
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Pilot Study
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Pilot Study
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Pilot Study – First Injection
• First injection on 3 August 2004
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Pilot Study – First Injection
• First injection on 3 August 2004
• 3.75 kg of Dry Soluble 80
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Pilot Study – First Injection
• First injection on 3 August 2004
• 3.75 kg of Dry Soluble 80
• 115 L of distilled water
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Pilot Study – First Injection
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Pilot Study – First Injection
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Pilot Study – First Injection
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Pilot Study – First Injection
• Solution of approximately 33.1 g/L
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Pilot Study – First Injection
• Solution of approximately 33.1 g/L
• Approximately 40 L poured into each of 3 injection wells
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Pilot Study – First Injection
• Solution of approximately 33.1 g/L
• Approximately 40 L poured into each of 3 injection wells
• Rate of approximately 3.33 L/s
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Pilot Study – First Injection
• Weekly – field screening for pH, temperature, specific conductance, EC, TDS, DO and ORP
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Pilot Study – First Injection
• Weekly – field screening for pH, temperature, specific conductance, EC, TDS, DO and ORP
• Weekly at closest wells – laboratory analysis for TEH
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Pilot Study – First Injection
• Weekly – field screening for pH, temperature, specific conductance, EC, TDS, DO and ORP
• Weekly at closest wells – laboratory analysis for TEH
• Weekly at “anaerobic” wells – laboratory analysis for ferric/ferrous, nitrate/nitrite, and sulfate/sulfite speciation
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Pilot Study – First Injection
• Weekly – field screening for pH, temperature, specific conductance, EC, TDS, DO and ORP
• Weekly at closest wells – laboratory analysis for TEH
• Weekly at “anaerobic” wells – laboratory analysis for ferric/ferrous, nitrate/nitrite, and sulfate/sulfite speciation
• Monthly – laboratory analysis for routine parameters, major ions and dissolved metals, and hydrocarbons (BTEX, F1, F2, TEH)
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Pilot Study – First Injection
• What happened?
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Pilot Study – First Injection
• What happened?
• After 28 days…
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Pilot Study – First Injection
• What happened?
• After 28 days…
• …Not much
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Pilot Study – First Injection
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Pilot Study – 2nd Injection
• Second injection on 8 September 2004
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Pilot Study – 2nd Injection
• Second injection on 8 September 2004
• Three batches of 6.35 kg of Dry Soluble 80
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Pilot Study – 2nd Injection
• Second injection on 8 September 2004
• Three batches of 6.35 kg of Dry Soluble 80
• 189 L of distilled water per batch
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Pilot Study – 2nd Injection
• Solutions of approximately 33.6 g/L
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Pilot Study – 2nd Injection
• Solutions of approximately 33.6 g/L
• 189 L poured into each of 3 injection wells
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Pilot Study – 2nd Injection
• Solutions of approximately 33.6 g/L
• 189 L poured into each of 3 injection wells
• Rate of approximately 1 L/min
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2nd Injection
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Pilot Study – 2nd Injection
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Pilot Study – 2nd Injection
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Pilot Study – 2nd Injection
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Pilot Study – 2nd Injection
• What happened?
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Pilot Study – 2nd Injection
• What happened?
• After 6 days…
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Pilot Study – 2nd Injection
• What happened?
• After 6 days…
• …humic product was visible in all of the wells!
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Pilot Study – 2nd Injection
• 04-MW19 – farthest downgradient monitoring well
o Initial (pre-injection) TEH = 4.5 mg/L
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Pilot Study – 2nd Injection
• 04-MW19 – farthest downgradient monitoring well
o Initial (pre-injection) TEH = 4.5 mg/L
o One week after second injection = 18 mg/L
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Pilot Study – 2nd Injection
• 04-MW19 – farthest downgradient monitoring well
• Additional evidence that the humic product is effective in mobilizing sorbed HCs
o Initial (pre-injection) TEH = 4.5 mg/L
o One week after second injection = 18 mg/L
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Recent Results
• Field parameters using a flow cell and mini-purging
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Recent Results
• Field parameters using a flow cell and mini-purging
• Monthly laboratory analytical results
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Future Work
• Biodegradation processes
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Future Work
• Biodegradation processes
• Collection of subsurface soil samples
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Acknowledgements
• Devon Canada Corporation – Tim Robbie
• Cathy Main, Mike LaPlante, Karen Hincks
• Dr. Dale VanStempvoort – National Water Research Institute
• Black Earth Humates Ltd.