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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

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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

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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

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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)

m.slooijer@greensoilgroup.com

T +31 6 51787912