STRASBOURG – FRANCE

STRASBOURG – FRANCE

Context & Project Description

This project was carried out under licence in collaboration with the company OGD – Ortec from October 2019 and June 2021. The contamination was due to the discharge of HAP and hydrocarbons (C>12). The soil came from various places along the canal (Citadelle Nord, Ouest and Sud, Starlette Nord and Sud). A thermal treatment platform was set up near the polluted soil, which was excavated and gradually brought to this platform.

Equipment

41 Natural Gas Smart Burners – Reburn treatment (Vapor Treatment with granulated activated carbon from the seventh batch)

Heating tubes

  • 41 Heating tubes and 14 Exchanger tubes (batch 1, 2, 5, 6 and 7)
  • 35 Heating tubes and 12 Exchanger tubes (batch 3)
  • 29 Heating tubes and 10 Exchanger tubes (batch 4)

Treatment target

  • 250°C at the cold points
  • Batch 1 to 4: 640 mg/kg of Hydrocarbons (C10-C40) and 136 mg/kg of HAP
  • From the 5 batch: 500 mg/kg of Hydrocarbons (C10-C40) and 50 mg/kg of HAP

Heating duration

2 days (batch 1), 43 days (batch 2), 55 days (batch 3), 56 days (batch 4), 51 days (batch 5), 49 days
(batch 6) and 50 days (batch 7).

Figure 1: Duration of the treatment of the piles
Figure 2: Average temperature at cold points

Monitoring

  • 5 temperature probe wells in the Bottom (at depths 2.3 m, 7.1 m, and 11.9 m)
  • 5 temperature probe wells in the Middle (at depths 2.3m, 6.35 m, and 10.4 m)
  • 5 temperature probe wells in the Top (at depths 2.3m, 5.6 m, and 8.9 m)
  • 5 pressure wells
  • 1 Gaz analyser (CO, CO2, O2, T°, NO, NOX, SO2, CxHy and CH4)

Planning

October 2019 to June 2021

Conclusion

The heat treatment of 10,000 m3 in 7 piles was a great success. The percentage of burner operation during the treatment of the 7 piles was of 97% on average. This project has become a reference in terms of heating control and energy consumption.

Key Data

Contaminants
HAP, C10-C40

Max. Concentration
HAP:
1872 mg/kg
C10-C40: 3907 mg/kg

Volume
10000 m³

Tonnage
18720 Tons

Nb of Heating Tubes
105

Temperature Target
250°C

Project Duration
356 days in total

Treatment Targets
BATCH 1 TO 4: 

HAP: 136 mg/kg
C10-C40: 640 mg/kg

BATCH 5 TO 7: 
HAP: 50 mg/kg
C10-C40: 500 mg/kg

Location
Strasbourg, France

Future Use
Residential

Client
OGD, Groupe Ortec

Partner
OGD, Groupe Ortec

Date
2019-2021

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