Head office: IncubaThor – Thor Park 8300 – 3600 Genk
Contact: +32 89 39 59 29 – [email protected] – www.greensoilgroup.com
BIOLOGICAL ANAEROBIC DEGRADATION OF VOCs COMBINED WITH RECIRCULATED (HEATED) GROUNDWATER
Martin Slooijer – GreenSoil Group
RemTech Europe – Soil Remediation19th September 2019
Brazil
Office: Sao Paulo
The Netherlands
Office: Papendrecht
Belgium
Office: Genk / Ghent
GreenSoil• Innovative General Contractor specialized in bioremediation
Project file
3
Client Confidential
Location Confidential (France)
Period 2016-2021
Contaminant type 1,2-DCA and DCM (mainly) in soil and groundwater
Project scope Pilot test and full scale cVOC remediation: bioremediation and heating
Remedial strategy In situ enhanced anaerobic degradation of groundwater contamination In situ heating of groundwater by aboveground heating and recirculation
Up to date Pilot test successfully completed.Full scale remediation.
Next steps Full scale in situ biological remediation. Anticipated remedial time groundwater = 2 years.
Remediation objective is to protect underlying aquifer
• Stimulation of anaerobic biodegradation
• Limited heating of the soil to about 25°C
Pilot:
• 1 layer (11-15 m-bgl)
• Follow-up over 6 months period
4
Pilot test set-upFullscale remediation system
4
Pilot Area
Fullscale remediation system
15-20 m-gl
Pilot
System Installation
• 1 extraction well
• 4 infiltration wells
• 2 new monitoring wells
• 6 Divers (Temperature) in wells
• Control unit:• Control panel• Piston pump• Heater• Dosing unit (Dehalo-GS)
+ Heat andElectrondonor
Operation & Maintenance Phase
First 3- months issues:
• Pistonpump : • Problems with proces controls / stable operation of system→Submersible pump
• Heater (flow throug cell): • clogging with chalk / unknown depositions (stoney)→ Frequent maintenance / cleaning of the heater
Results – Scaling heater
• Stone like material
• Not completely “soluble” in strong acid
• Strong sulfide odor
1-10-2019
before after
Results – Proces parameters
• MP1-pump flow ~ 0.6-0.7 m3/hr
• ~ 2,000 L of Dehalo-GS / 6 months.
Piston Pump MP1 Pump
Unit off, due to electrical issue
Results - Temperature
• …
DW08
DW07
DW09
EW1
Diver installed shallower
Results - Temperature
>25°C>17°C
Not operational
Results - Analytical
Results - Analytical
0
10000
20000
30000
40000
50000
60000
70000
80000
90000
100000
25-Apr-17 14-Jun-17 3-Aug-17 22-Sep-17 11-Nov-17 31-Dec-17 19-Feb-18 10-Apr-18
Co
nce
ntr
atio
n (
µg/
l)
DCM
DW07 DW08 DW09 DW15.001 EW15.001
0
10000
20000
30000
40000
50000
60000
70000
80000
90000
100000
25-Apr-17 14-Jun-17 3-Aug-17 22-Sep-17 11-Nov-17 31-Dec-17 19-Feb-18 10-Apr-18
Co
nce
ntr
atio
n (
µg/
l)
1,2-DCA
DW07 DW08 DW09 DW15.001 EW15.001
Peak in Oct/Nov, possibly due to increased mobilisation followed by increased flow of MP1 pump
Submersible pump installed
Degradation DCM
Pre-investigation (Dehalococcoides 106 cells/l)
Degradation 1,2-DCA
Results - Molecular
Results - Molecular
1,00E+00
1,00E+01
1,00E+02
1,00E+03
1,00E+04
1,00E+05
0
10000
20000
30000
40000
50000
60000
13-Jun-17 13-Jul-17 13-Aug-17 13-Sep-17 13-Oct-17 13-Nov-17 13-Dec-17 13-Jan-18
Dco
c (c
ells
/ml)
Co
nce
ntr
atio
n (
µg/
l)DW07
Dcoc DCM 1,2-DCA ethene
Conclusion Pilot
• Strong decrease of both 1,2-DCA and DCM concentrations (95-99%)
• Increase of ethene (degradation product) in majority of wells
• Degradation potential confirmed by molecular analyses
• Only limited mobilization/attraction due to increased flow/heating
• Strong decrease even with only electrondonor dosing
Pilot - Fullscale
Pilot usefull to better design Full scale:
• Deepwell pumps instead of aboveground pumps / larger diameter well
• Continuation of the pilot to maintain the good conditions / biological activity
• Full scale started in Q1 2019 – 3 layered system
Heating only optional:
• No clear benifit of heating
• If needed use steam of site to heat (to avoid problems with clogging and high power consumption)
Full scale: in situ system
1-10-2019 17
1-10-2019 MTBE
Thank your for your attention!
Contact details
Martin Slooijer (Managing Director)
T +31 6 51787912
