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

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

Aug 25, 2022 19 likes •230 views

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

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SLIDE 1

Integrity  Excellence  Responsibility

Presenting Members

A New Microcosm Design for Treatability Assessment in Cold Region Petroleum Hydrocarbon Impacted Clayey Sites

Aimée Schryer, Lisa Moehlman and Steven D. Siciliano

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SLIDE 2

Microcosm Designs

  • Microcosm design

limitations

  • Alters soil properties
  • Surface area
  • Structure
  • Fractured Flow
  • Microbial communities
  • Extrapolation
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SLIDE 3

Objective

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

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SLIDE 4

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

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SLIDE 5
  • 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

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SLIDE 6

Methods – Microcosm Assembly

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SLIDE 7

Methods – Microcosm Assembly

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SLIDE 8

Methods – Microcosm Assembly

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SLIDE 9

Methods – Microcosm Assembly

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SLIDE 10

Methods – Microcosm Assembly

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SLIDE 11

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 x±? Log(BTEX/F1 concentration in bio-stimulatory solution)+1 y±? (BTEX/F1 concentration in Soil)1/3

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SLIDE 12

Bio-stimulatory Concentrations Track Soil Concentrations

  • For initial (1 hour)

timeframe

  • Each point signifies

a microcosm

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SLIDE 13

Bio-stimulatory Concentrations Track Soil Concentrations

  • For initial (1 hour)

timeframe

  • Each point signifies

a microcosm

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SLIDE 14

Bio-stimulatory Concentrations Track Soil Concentrations

  • For initial (1 hour)

timeframe

  • Each point signifies

a microcosm

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SLIDE 15

Quality Control Experiments

  • Water solution
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SLIDE 16

Quality Control Experiments

  • Gamma Radiation
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SLIDE 17

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.

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SLIDE 18

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

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SLIDE 19

Integrity  Excellence  Responsibility

Questions?

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SLIDE 20

Allan Summary Data for Transformation Outlook Summary Data for Transformation

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SLIDE 21

Davidson Summary Data for Transformation