Table 1.1
A comparative evaluation of soil-washing and soil-flushing treatments
Technology Requirements
Advantages
Drawbacks/limitations
Yield
(%)
Duration
parameters
Cost
Soilwashing
Excavated soils
• Sorting and high segregation
of washed fractions
•Accessibility to pollutants
• Separation efficiency
• Full control of treated soils
• Nuisances (dust, noise, smell)
•Not feasible in SZ
• Max depth achievable 7 m
• Not profitable when
fines > 20%
•Complex treatment train
Up to
95–98
Dozens of
tons d
À1
5–50
€ m
À3
for
excavation
On site:
35–100
€ ton
À1
Ex situ :
75–220
€ ton
À1
Soilflushing
• Recovery of contaminated GW
• Monitoring of
GW quality
• Minimal works and
gas-emissions
• Soil properties may be
unaffected
• Permeability (!10
À5
m s
À1
) and low
contrasts
• Geological and hydrogeolical site
characterizations
•Access to pollutants and homogeneous
treatment not warranted
• Risk for pollution displacement
• Long duration for treatment
• High wastewater volumes to be
treated
Up to
50–80
Several
months to
years
20–120
€ ton
À1
GW
groundwater
10
N. Fatin-Rouge