In situ radio frequency heating isrfh at a former service station in kent
This presentation is the property of its rightful owner.
Sponsored Links
1 / 30

In Situ Radio Frequency Heating (ISRFH) at a Former Service Station in Kent. PowerPoint PPT Presentation


  • 44 Views
  • Uploaded on
  • Presentation posted in: General

In Situ Radio Frequency Heating (ISRFH) at a Former Service Station in Kent. Contaminated Land and Brownfield Remediation London 22 September 2009 Giacomo Maini, BSc, PhD Managing Director Ecologia Environmental Solutions Ltd. Ecologia. We are a technical remediation contractor

Download Presentation

In Situ Radio Frequency Heating (ISRFH) at a Former Service Station in Kent.

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


In situ radio frequency heating isrfh at a former service station in kent

In Situ Radio Frequency Heating (ISRFH) at a Former Service Station in Kent.

Contaminated Land and Brownfield Remediation

London

22 September 2009

Giacomo Maini, BSc, PhD

Managing Director

Ecologia Environmental Solutions Ltd


In situ radio frequency heating isrfh at a former service station in kent

Ecologia

  • We are a technical remediation contractor

  • We are a UK company

  • Offices in Kent, Devon, Staffordshire and Bologna

  • Our workshops are at our headquarters in Kent


Rf technology

RF Technology

  • Background of the RF technology

    • Partnership with Hemholtz-Centre for Environmental Research - UFZ in Germany

    • Trial tests performed at the Kent Science Park (Sittingbourne) on pristine soils

    • Commercial project in Watford

    • Trial test at former petrol station in Kent owned by Total UK

    • CL:AIRE Technology Development Programme (TDP) 28

    • Covered by joint (Ecologia-UFZ) European Patent


Principle of the rf technology

Principle of the RF Technology


Principle of the rf technology1

Principle of the RF Technology

Electromagnetic field emitted into the soil

Polar Molecules excited by the electromagnetic field

Heat generated

Increase rate of volatilisation

Reduction in time required for SVE


Elements of the rf system

Elements of the RF system

  • RF Generator

  • Matchbox

  • Electrodes

  • Shielding

  • Sensors

  • Laser

  • Overall system

Fiber optic

Thermo-couple


Health and safety

Health and Safety

  • No existing standard in UK

  • Guideline International Committee on No-Ionizing Radiation Protection (ICNIRP)

    • Maximum level


Manston field trial

Manston field trial

  • Soil – Chalk

  • Groundwater table – approx. 55 m bgl

  • Type of Contamination – BTEX and light (<C8) to medium molecular weight (>C12-C16) hydrocarbons

  • Depth of contamination – In the unsaturated soil mostly between 3 to 10 m bgl.


Manston field trial 3d

Manston field trial 3D


The field trial set up

The Field Trial Set Up


Contaminant concentration t 0

Contaminant Concentration T=0


Operation methodology

Operation Methodology


Monitoring methodology

Monitoring Methodology

  • Extracted VOC measured on line using a Total Volatile Organic Sensor (TVOC)

  • TENAX tubes followed by GC-MS at set intervals.

  • PID

  • Airflow

  • Soil and air temperature


Tvoc vs tenax

TVOC vs. TENAX

Conversion factor

1.74


Results temperature

Results – Temperature


Extraction rates vs temperature

Extraction Rates vs. Temperature


Extraction rates vs temperature1

Extraction Rates vs. Temperature


Cumulative vocs removal vs temperature

Cumulative VOCs Removal vs. Temperature


Cumulative vocs removal

Cumulative VOCs Removal


Soil validation tph

Soil Validation – TPH


Observations

Observations

  • Volatile compounds (BTEX and TPH >C8–C10) >90% - 99% reduction).

  • Lower removal was measured near extraction well SVE 2 suggesting that the remediation process had not been fully completed at the end of the trial.

  • Higher molecular weight hydrocarbons (TPH fraction >C10-C16) reduced approx 80% on average). Some concentration build up near the SVE wells where soil temperature is likely to be lower.

  • TPH fractions >C16-C35 lower initial concentration but showed similar behaviour as semi-volatile fractions.

  • The extent of the reduction observed for the s-VOC (approx 80%) cannot be solely attributed to analytical error.

  • Biodegradation and in-situ hydrolysis were considered as two potential explanations for such reduction.


Mass balance

Mass Balance


Energy requirements

Energy Requirements

kWh cost set @ £0.12


Cooling rate sve only

Cooling Rate SVE Only

°C/Day = 0.374


Energy input to remove same mass of contaminant 945 kg

Energy Input to Remove Same Mass of Contaminant (945 kg)


Observations1

Observations

  • ISRFH technology would reduce:

  • Time required for remediation by 86% (i.e.7 fold 46 days vs. 325 day)

  • Energy input by 42% when compared to a traditional SVE with no heating.


Estimated costs based on 480 m 3 of soil treated

Estimated costs (based on 480 m3 of soil treated)

  • ISRFH (10 weeks treatment) – inclusive of CAPEX depreciation, maintenance monitoring, energy - £194/m3 or £96/tonne (Chalk density = 2.022 g/cm3).

    Note:Energy cost to achieve average 50°C in soil approx 20% of the remediation costs.

  • Excavation and disposal to landfill as hazardous waste (5 weeks operation) - inclusive of sheetpiling, backfilling and site set up -£398/m3 or £197/tonne


Additional considerations

Additional Considerations

  • ISRFH treatment vs. traditional in-situ technologies–

    • Speed of the ISRFH technology in removing volatile contaminants

    • Can SVE alone actually remove the contaminants?


Conclusions

Conclusions

ISRFH significantly improves the removal rate of VOCs and s-VOC from the unsaturated Chalk with a marked reduction in treatment times without entailing excessive energy costs


In situ radio frequency heating isrfh at a former service station in kent

Thank You


  • Login