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Presentation Outline
Site description What is co-composting? Treatment strategy Lab and pilot-scale Full-scale Conclusion
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Co-Composting of Soil Impacted by Hydrocarbons Eric Bergeron, ing., - - PowerPoint PPT Presentation
Co-Composting of Soil Impacted by Hydrocarbons Eric Bergeron, ing., - - PowerPoint PPT Presentation
Co-Composting of Soil Impacted by Hydrocarbons Eric Bergeron, ing., M.Sc.A., Associate Presentation Outline Site description What is co-composting? Treatment strategy Lab and pilot-scale Full-scale Conclusion 16-05-05 2
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Site Description
Heavy industrial area Former petrochemical activities Underground/above ground utilities
dismantled
Fractured clay et silt Free phase Heavy TPH and PAH 120 000 m3 of impacted soil Remediation target : 3500 ppm C10C50
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Organic amendments + soil + air + water (60% WHC) Typical temperature : 55-70 oC Thermophilic +mesophilic bacteria ↑solubility of C/N/P ↑bioavailability ↓ Clay cohesiveness
- Composting is a process in which organic matter are degraded quickly by
microorganisms at elevated temperatures under aerobic condition (C/N ≈ 20-30)
- Co-composting → add organic amendments (manure) to the impacted soil to
enhance biodegradation
What is co-composting?
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45 46 47 48 49 50 5 10 15 20 20 40 60 80 100 120
Temperature (°C) % O2, CO2 in air Time (min)
Oxygen Carbon dioxide Temperature
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Windrow Modified Biopile
Co-Composting
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Strategy
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SCM Remediation Options Treatability Testing Approach Selection Design et planning Implementation O&M Shut-down
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Remediation Options
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- Composting
Thermal desorption Composting and Thermal desorption
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Laboratory Testing
Degradation rate → treatment time Microcosms (Montreal & Calgary) Reactor (200 L - 1 m3)
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Laboratory Testing
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9
Thermocouple Implants/air
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Pilot-Testing
200 m3 biopile Temperature monitoring Gas monitoring 5 months operation 3 mixtures tested
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Pilot-Testing
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Full-Scale
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48 piles of 700-1000 m3 8 air extraction system of 1200 cfm Leachate recirculation system Fully automated system Organic amendments : < 30% v/v
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Full-Scale
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Excavation
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Full-Scale
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10 weeks 5-6 days 20 oC →70 oC
Pathogen limit
DARAMEND
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Full-Scale
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Full-Scale
F2 (C10C16): 5% F3 (C16C34): 27% F4 (C34C50): 12% F4G (C50+): 55%
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CONCLUSIONS
Co-composting is an efficient biological process, cost competitive and sustainable which can treat hydrocarbons that are recalcitrant to conventional biopile
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QUESTIONS
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