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Environmental Geotechnology Presentation Naval Air Station, Pensacola, Florida.

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Presentation on theme: "Environmental Geotechnology Presentation Naval Air Station, Pensacola, Florida."— Presentation transcript:

1 Environmental Geotechnology Presentation Naval Air Station, Pensacola, Florida

2 Naval Air Station

3 Introduction  Naval Air Station  5,800 acres  3km southwest of Pensacola  A flight training centre  Aviation depot  Rework facility  Industrial wastewater treatment  Aim – Protect Pensacola Bay from contaminant

4 Contaminated Area  Area affected by leakage Dry sludge bed Surge pond Ground water Underlying soil

5 Contaminants Chlorinated and non chlorinated solvents Trichloroethene (TCE) Dichlorateethene (DCE) Dichlorateethane (DCA) Vinyl chloride (VC) Ammonia Heavy metals Paints Plating wastes PCBs

6 Geological Data  Medium sand and silt at top 2 m  Medium-fine quartz sand between 2 – 40m  Water table 4~6m  Low chemically reactive  Little ability to absorb contaminant

7 Remedial Action Operation 1 st Pump and Treat (P&T)  Soil removal for Sludge bed Surge pond  Dewater contaminant soil  Disposed as a listed waste  Area cover with low permeability material  Water extraction Treated at waste water treatment plant

8 Remedial Action Operation 1 st Pump and Treat (P&T) Waste Water Treatment Plant Groundwater Contaminant

9 Remedial Action Operation 2 nd Natural Attenuation Process 1996  Micro organisms degrade organic substances for nutrition and energy  Hazardous less toxic or non-toxic  Both aerobic and anaerobic biodegradation of contaminants occurs CH C H 2 0

10 Remedial Action Operation 2 nd Natural Attenuation Process 1996  Reduce in Trichloroethene (TCE) Vinyl chloride (VC), Dichloroethene (DCE), Dichloroethane (DCA), Biodegradation product  Shout down P & T system for further natural attenuation assess

11 Remedial Action Operation 3 rd In Situ Chemical Oxidation  Fenton’s Reagent Method  Install carbon steel injectors  Injection concentrated hydrogen peroxide ferrous iron catalyst  Hydroxyl radicals reaction powerful, effective and no special oxidizing agent

12 Remedial Action Operation 3 rd In Situ Chemical Oxidation  Small scale In Situ Chemical Oxidation Remediation Injector

13 Remedial Action Operation 3 rd In Situ Chemical Oxidation  Reduce organic contaminant chlorinated compounds in groundwater  Non toxic by product water, carbon dioxide, hydrogen and chloride ions RHX Fe2+ + H 2 O 2 H 2 O + CO 2 + H + + X -

14 Remedial Action Operation 3 rd In Situ Chemical Oxidation  Phase 1 November ,089 gallons of injection Reduced 81% chlorinated volatile organic compound (CVOCs)  Phase 2 May ,038 gallons of injection Reduced 97% of CVOCs

15 Conclusion  In Situ Oxidation Process Efficient for reducing CVOCs in a short period of time  Natural Attenuation Process Remediate remaining contaminant Require a reasonable period of time It eliminated P&T and reduced the cost on  long term remedial operation  monitoring

16 The End


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