Londerzeel - feasibility study and full scale remediation of Phthalates

At the Londerzeel project, a large LNAPL of phtalates is present due to a fire incident in the 80's. Given the specific pfysico-chemical characteristics of the phtalates a feasibility study was conducted to assess free phases separation, LNAPL mobility and biodegradibility of the phtalate contamination.

Based on the positive outcome of the feasibility study, Greensoil prepared a full scale remediation concept based on a combination of free phase removal by bioslurping and biosparging for residual, non mobile product.

The RAP based on our remedial concpet is currently being prepared. Full scale remedial works are expected to start in Q2 2018.   


Location Londerzeel, Belgium
Client Confidential
Duration Q2-Q3 2017 (Feas. Study) Q2 2018-Q2-2021 FS
Contract Garanteed outcome contract
Contamination Phthalates (DEHP: diethylhexyl phthalate)
Techniques NAPL removal by biolsurpoing, in situ biosparging and aerobic bioremediation

NAPL extraction system (bioslurping)

Biological water treatment (air/water separator, oil water separator, bioreactors & polshing WAC filtration

In numbers

Project value > 250.000 €
Pure product 131 ton (estimated)
Pure product 1873 m³ (estimated)

Feasibility test



Concentration Degradation Period Status
1.000 mg/l 72% 70 days Completed


in soil  

in water  

Max. conc. BSN Status
> 1.800 mg/kg TBD ongoing
4.100 µg/l TBD ongoing
Number of wells

40 injection and/or extraction wells

20 biosparging wells

Used techniques

In-situ: aerobic biodegradation, air-/biosparging, (D/L)NAPL removal, pump and treat & multi phase extraction/bioslurping

Treatment system: biological groundwater treatment

Contamination: others