Effective Remediation of Gun Propellant Residues in Surface GROUPE - - PowerPoint PPT Presentation

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Effective Remediation of Gun Propellant Residues in Surface GROUPE - - PowerPoint PPT Presentation

Oct 22, 2022 21 likes •272 views

Effective Remediation of Gun Propellant Residues in Surface GROUPE DE SOUTIEN DE LA 5 e DIV CA Soils Using Commercially Available Asphalt Heaters 5 TH CDN DIV SUPPORT GROUP Presenter: Kelsey Keys Connell 5CDSG Environmental Coordinator Guy

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Guy Ampleman, Sonia Thiboutot & Michel Kervarec

DRDC – Valcartier/Weapon Systems Sheldon Downe 5CDSG Chief of Environmental Services Branch

Effective Remediation of Gun Propellant Residues in Surface Soils Using Commercially Available Asphalt Heaters

Presenter: Kelsey Keys Connell 5CDSG Environmental Coordinator

UNCLASSIFIED

NOTICE (U) (U) This document has been reviewed and DOES NOT ¡CONTAIN ¡controlled ¡ goods.

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Outline

Background Objective Trials and Technologies Results Next Steps Questions

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

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5th CDSB Gagetown

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

5CDSB Gagetown RTA

Training Area: 1,100 Sq Km2 Canada’s second largest military training area Centre of Excellence for Army Training

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

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FIRING POSITIONS WELLINGTON RANGE

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

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84mm

  • High deposition rate of Nitrocellulose(NC) /

Nitroglycerin(NG) based propellant

  • High NG concentrations behind firing positions
  • NC is highly insoluble and resilient
  • After 25 years of inactivity, still over 4000 ppm in surface soils

Anti-Tank Firing Background

M72

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Health and Safety Risk

  • Surface soil ignition causing fire upon discharge
  • f weapons
  • Fire could trigger detonation of stockpiled

munitions

  • Inhalation of NG leads to strong headaches

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Objective

  • The objective of this trial was to establish

if NG concentrations in soil at firing points could be reduced using high heat technology

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Option analysis for remediation

  • NC matrix highly water insoluble, prevents the use of

bioremediation

  • NC resistance prevents the use of chemical reduction,

hydrolysis or oxidation

  • Ex-situ treatment using soil stabilization (STABLEX) limited by

the high concentrations of energetic materials (limit of 5000 mg/kg)

  • Contamination concentrated at surface, in the first 10-15 cm
  • Incineration was selected as the preferred option as NG

destruction temperature is around 200oC

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Burning Technologies

  • In-situ technology using solvent
  • Trials ran from 2009-2011 by Isabelle Poulin from DRDC
  • Two drawbacks:

– Too expensive for large scale deployment – Temperature not high enough to burn NG in subsurface

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Direct Flame Burning

  • Hand-held propane burner delivering heat as a direct flame
  • Trial conducted at Carpiquet, Quebec the summer of 2013
  • Drawbacks

– Time consuming, not user friendly – Difficult to manage for large scale deployment – Temperatures not sufficient to burn NG completely at the surface – Insufficient heat penetration did not allow burning of NG in sub-surface

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Asphalt Heating Technology

  • Portable infrared heater uses a radiant blue flame
  • Tested in two trials conducted in 2013 and 2014
  • First trial performed with a IR-Proheater single at two locations

at Wellington Range firing positions

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

2013 Trial Results

  • After 15 minutes exposure: NG surface soil concentrations

decreased from 1960 to 1650 mg/kg for 17% reduction

  • After 30 minutes exposure: NG surface soil concentrations

decreased from 310 to 260 mg/kg for 14% reduction

  • Average of 15% reduction was achieved for both trials
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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

2014 Trial

  • Performed in September 2014 using a larger heater (Asphalt Reheat

System – Manta Ray EXT)

  • Probes were used to measure the temperature at different depths down

to 25 cms

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Manta Ray EXT Trailer by ARS

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Sample locations

  • Location A:

– Sampled prior to heating – Heating period of 30 minutes – resampled – Re-heating for another 30 minutes and re-sampled

  • Location B:

– Sampled prior to heating – Heating period of 60 minutes – resampled – Re-heating for 60 minutes, re-sampled including sub-surface

  • Location C:

– Sampled prior to heating – Heating period of 240 minutes – Resampled the surface

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Results – 30+30 Minutes

  • After 30 minutes of heating, temperatures reach 340oC
  • After a cooling period plus an additional heating time
  • f 30 minutes, temperatures reach 425oC
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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Results 60+60 Minutes Heating

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

After Heating

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Following 4 hours of Heating

  • Visual observation of soil drying down to a depth of

15 cm

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2014 Results

NG Concentrations

Location A Location B Location C Before 9,300 mg/kg 2,500 mg/kg 13,000 mg/kg Heating Time 30 minutes 30 + 30 minutes 60 minutes 60 + 60 minutes 240 minutes After 1,000 mg/kg ND ND ND ND After sub- surface 0-15 cm ___ ___ ___ ND ___ After sub- surface 15-30 cm ___ ___ ___ 75 mg/kg ___

ND=Non Detect

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Conclusions

  • Portable infrared heating technology successfully reduced NG

concentrations in surface soils.

  • Maximum surface soil temperatures achieved: 470 C°
  • Complete degradation of NG in surface soils after one hour.
  • Technology easy to deploy, very efficient at heating soils down

to 15 cm, cost effective.

  • This technology has potential to be used as a remedial tool for

anti-tank range firing points, but also at sites containing single, double or triple base propellants (Demo Sites).

  • Not appropriated for gun propellants (2,4-DNT based).
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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Way Ahead

  • Additional trials will be conducted to establish specific

heating times, including subsurface sampling for each trial (before and after)

  • Trials will be conducted in other soil types
  • Further investigation into this technology will be undertaken

this coming summer for other sites

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5TH CDN DIV SUPPORT GROUP GROUPE DE SOUTIEN DE LA 5e DIV CA

Questions?

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