Hydrocarbon Impacted Clayey Sites Aime Schryer, Lisa Moehlman and - PowerPoint PPT Presentation

A New Microcosm Design for Treatability Assessment in Cold Region Petroleum Hydrocarbon Impacted Clayey Sites Aimée Schryer, Lisa Moehlman and Steven D. Siciliano Presenting Members Integrity  Excellence  Responsibility

Microcosm Designs  Microcosm design limitations • Alters soil properties • Surface area • Structure • Fractured Flow • Microbial communities • Extrapolation

Objective Improve current microcosm designs to better mimic cold region PHC contaminated site

Background  Want a site representative unit to test new techniques  Keeps soil intact • Structure • Microbial activity • PHC “pockets”  BTEX/F1 in water tracking BTEX/F1 in soil

Methods – Microcosm Assembly • Use cores with varying PHC concentration • Constructed and shake for 1 hour • Water samples taken for BTEX/F1 concentrations • Destructively sample the microcosms for final BTEX/F1 concentrations

Methods – Microcosm Assembly

Methods – Microcosm Assembly

Methods – Microcosm Assembly

Methods – Microcosm Assembly

Methods – Microcosm Assembly

How to transform the data  Ordinary least-squares regression (OLR) not applicable  OLR assumes only y axis contains measurement errors  Causes biased slope  Deming better suited  Both measurements subject to random errors  Can specify variance in the dependent variable. y = mx+b y±? (BTEX/F1 concentration in Soil) 1/3 x±? Log(BTEX/F1 concentration in bio-stimulatory solution)+1

Bio-stimulatory Concentrations Track Soil Concentrations • For initial (1 hour) timeframe • Each point signifies a microcosm

Bio-stimulatory Concentrations Track Soil Concentrations • For initial (1 hour) timeframe • Each point signifies a microcosm

Bio-stimulatory Concentrations Track Soil Concentrations • For initial (1 hour) timeframe • Each point signifies a microcosm

Quality Control Experiments  Water solution

Quality Control Experiments  Gamma Radiation

A New Treatability System  No changes were noted in water and sterile microcosms suggesting that there were no abiotic losses.  BTEX/F1 in water closely tracks BTEX/F1 in soil.  This means no need to destructively sample soil.  Weekly water changes do not significantly deplete BTEX/F1 in microcosm  Design allows for flexible use.  For example, we have constructed microcosms using strict anaerobic technique.

Acknowledgements Supervisor: Dr. Steven Siciliano The Environmental Soil Toxicology Lab Group and Undergrads (5E75) Sustainable In-Situ Remediation Co-operative Alliance (SIRCA) Federated Co-operatives Limited

Questions? Integrity  Excellence  Responsibility

Allan Summary Data for Outlook Summary Data for Transformation Transformation

Davidson Summary Data for Transformation