CLEAN-UP OF A MAJOR DIESEL SPILL IN WESTERN AUSTRALIA R Stewart 1 , - - PowerPoint PPT Presentation

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clean up of a major diesel spill in western
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CLEAN-UP OF A MAJOR DIESEL SPILL IN WESTERN AUSTRALIA R Stewart 1 , - - PowerPoint PPT Presentation

Nov 24, 2023 37 likes •218 views

THE USE OF REMSCAN TO ACCELERATE THE CLEAN-UP OF A MAJOR DIESEL SPILL IN WESTERN AUSTRALIA R Stewart 1 , G Webster 1 , E Travers 1 , J Filmer 1 , J Elsworth 1 , C Lawrence 1 , S Forrester 2 , L Janik 2 , M McLaughlin 2 1 Ziltek Pty Ltd, 40-46

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THE USE OF REMSCAN™ TO ACCELERATE THE CLEAN-UP OF A MAJOR DIESEL SPILL IN WESTERN AUSTRALIA

R Stewart1, G Webster1, E Travers1, J Filmer1, J Elsworth1, C Lawrence1, S Forrester2, L Janik2, M McLaughlin2

1Ziltek Pty Ltd, 40-46 West Thebarton Rd, Thebarton, SA 5031 2 CSIRO Land and Water, PMB 2, Glen Osmond, SA 5064

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SLIDE 2

What is RemScan?

  • Handheld infrared instrument for the direct

measurement of TPH in soil

  • User simply pulls the trigger for a 15 second

readout of TPH (C10 - C36) in mg/kg

  • No consumables or chemicals required
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Diesel Spill at Tank Farm Site, WA

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The Spill Response

  • Project under a high level of scrutiny
  • Sensitive surrounding environment
  • Ongoing investigation
  • Required rapid response
  • Minimise risk of further release
  • Avoid storm water impacts
  • Clean up criteria
  • 400 mg/kg TPH (C10 to C36)
  • Total removal of impacted materials
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SLIDE 7

Clean Up Validation

  • Ziltek was engaged to supply and operate a

RemScan unit to assist site validation works by:

  • Accelerating project closure - same day decisions
  • Increasing confidence - more data
  • Minimising lab costs – accurate screening tool
  • It was decided to build a site-specific calibration

model in the RemScan unit to:

  • Reduce soil interferences (e.g. carbonates)
  • Lower detection limit
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SLIDE 8

Building a Site Specific Calibration

Collect 36 samples from site Scan using RemScan (5x) NATA lab analysis TPH Build model Infrared spectra Data Load RemScan *Entire process completed in 5 days

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Cross Validation of RemScan versus Lab

5,000 10,000 15,000 20,000 25,000 30,000 35,000 5,000 10,000 15,000 20,000 25,000 30,000 35,000

RemScan TPH concentration (mg/kg) NATA accredited lab TPH concentration (mg/kg)

Detection limit = 78 mg/kg Relative error <10% R2 = 0.997

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Site Validation Process

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Independent RemScan Verification

  • The environmental superintendent selected 19

blind samples for verification

  • The samples were measured on site using

RemScan and then sent for NATA laboratory analysis

  • Each samples was scanned 5 times and the

average was compared with lab data

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SLIDE 15

5,000 10,000 15,000 20,000 25,000 30,000 35,000 5,000 10,000 15,000 20,000 25,000 30,000 35,000

RemScan TPH concentration (mg/kg) NATA accredited lab TPH concentration (mg/kg)

Cross Validation of RemScan versus Lab

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SLIDE 16

5,000 10,000 15,000 20,000 25,000 30,000 35,000 5,000 10,000 15,000 20,000 25,000 30,000 35,000

RemScan TPH concentration (mg/kg) NATA accredited lab TPH concentration (mg/kg)

5,000 10,000 15,000 20,000 25,000 30,000 35,000 5,000 10,000 15,000 20,000 25,000 30,000 35,000

RemScan TPH concentration (mg/kg) NATA accredited lab TPH concentration (mg/kg)

Cross Validation of RemScan versus Lab

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SLIDE 17

Project Outcomes

  • Site specific calibration developed in 5 days
  • Detection limit of 78 mg/kg TPH C10-C36
  • Relative error <10%
  • Completed site validation works in 4 days
  • Cost savings estimated by client at >$30,000
  • RemScan sets a new precedent for rapid

screening of TPH in soil

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SLIDE 18

Technology Partners

This project has been supported with assistance from the Australia Government through Commercialisation Australia.