Intervento di Petra Scanferla, CVR
Conferenza Finale Progetto GREEN SITE: “Supercritical fluid technologies for river and sea dredge sediment remediation”. LIFE 10 ENV/IT/343.
Venezia, 13 dicembre 2013
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I risultati del progetto Green Site
1. GREEN SITE
Action 4 – Technology assessment
CONSORZIO VENEZIA RICERCHE – dott. Petra Scanferla
2. Action 4 – Technology assessment
Sub – Action 4.1: Technical preparation (CVR)
Sub – Action 4.2: Evaluation (ALLES)
• AIM: assessing the prototype developed in order to investigate its
treatment efficacy of SFE and SCWO processes under real conditions with
selected contaminated soil and sediment samples.
• EXPECTED RESULTS:
clean-up (extraction) efficiency should be higher than 90% (SFE) and
over 90 % of efficiency in oxidation (SCWO) of target organic compounds;
improvement (by 30’-60’) of kinetic rates of extraction/oxidation of target
organic compounds;
end-products generated should be easily managed and discharged
without further expensive or complex treatment;
possibility to realize compact equipment, easy to transport and to install in
the intervention sites;
practical guidelines on optimal use of prototype.
3. Action 4 – Technology assessment
Starting points for the assessment
1. Definition of the target organic pollutants
A) characterizing the sediment contamination
of the forthcoming industrial channel that need
to be dredged…
“ISAP - Indagine sui sedimenti e sulle
acque dei canali di Porto Marghera e
delle aree lagunari antistanti”
MAV/CVN - ICRAM
Primarily: PAHs
4. Action 4 – Technology assessment
Starting points for the assessment
1. Definition of the target organic pollutants
A) characterizing the sediment contamination
of the forthcoming industrial channel that need
to be dredged…
B) characterizing the contaminated soil and
groundwater of the industrial area
Primarily PAHs than
amines and
organochlorine
PAHs
5. Action 4 – Technology assessment
Starting points for the assessment
Chemical
PAH:
50 and 100 mg/kg d.m.
As
Cd
Cr
Cu
Hg
Ni
Pb
Zn
Tot. Hydrocabons
Total PAHs
PCBs
Chlor.Pesticides
Class B
Class C
Class C+
mg/Kg d.w.
2. Definition of the concentration
levels of the selected
contaminants in the samples
that will be used for the
evaluation of process
performance.
Class A
mg/Kg d.w.
mg/Kg d.w.
mg/Kg d.w.
15
1
20
40
0.5
45
45
200
30
1
0.01
0.001
25
5
100
50
2
50
100
400
500
10
0.2
0.02
50
20
500
400
10
150
500
3000
4000
20
2
0.5
>50
>20
>500
>400
>10
>150
>500
>3000
>4000
>20
>2
>0.5
DISPOSAL SITES:
A,B,C: in lagoon
C+: no contact with lagoon
6. Action 4 – Technology assessment
Protocols and Procedures
A. Definition of procedures for the collection and preparation of ad
hoc sediment samples and extracts to be used for the evaluation
tests of the processes.
B. Identification of the matrices (solid, liquid and gaseous) that need
to be characterized during the tests.
C. Definition of protocols :
Starting run and blank test Protocol
Processes optimization Protocol
9. Action 4 – Technology assessment
B. Identification of the matrices : SFE
Sediment
sampling point
after SFE
Sampling points for SFE
Stocks/extracs
sampling point
10. Action 4 – Technology assessment
B. Identification of the matrices
Sediment
sampling point
after SFE
Sampling points for SFE
Stocks/extracs
sampling point
11. Action 4 – Technology assessment
C. Protocols realization
Sediment sampling
after SFE
12. Action 4 – Technology assessment
C. Protocols realization
Stocks/extracs sampling
after SFE
13. Action 4 – Technology assessment
B. Identification of the matrices : SCWO
Emissions
control
after
SCWO
Sampling points for SCWO
Liquid sample
control after
SCWO
14. Action 4 – Technology assessment
C. Protocols realization
19. Action 4 – Technology assessment
SFE results
C+
C
B
Class A
27 KWh
22 KWh
20. Action 4 – Technology assessment
SFE results
Capacity of SFE
pilot plant = 5 kg/h
B
Class A
27 KWh
22 KWh
21. Action 4 – Technology assessment
SCWO results
Extract treated in 50’:
14,35 Kg (~7% of organic contaminants)
Emission
limit
D.Lgs
152/2006
1st TEST
pH
Mineral oil
Conductivity
TDS
N nitrogen
Chlorides
Sulphates
Cu
Zn
mg/L
µS/cm
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
Liquid output
during the
Liquid output (discharge
during the
Blank sample - oxidation with
into
Contaminated Liquid before
isopropyl
oxidation with surface
DM water
Extract
flame ignition alcohol (7,5%)
extract
w ater)
6,45
5,98
6,00
4,58
2,59
<0,1
<0,1
5
68400
<0,1
18,3
63,8
29,5
343
<10
<10
<10
80
<0,1
<0,1
0,68
20
0,79
0,728
0,62
1200
11,1
0,75
21,6
1000
<0,01
<0,01
<0,01
0,4
0,323
<0,05
0,448
0,5
99,99 %
22. Action 4 – Technology assessment
SCWO results
Extract treated in 53’:
17,1 Kg (~7% of organic contaminants)
Emission
limit
D.Lgs
152/2006
2nd TEST
pH
Mineral oil
Conductivity
TDS
N nitrogen
Chlorides
Sulphates
Cu
Zn
Capacity of SCWO
pilot plant = 20 kg/h
mg/L
µS/cm
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
Liquid output
Liquid output (discharge
during the
during the
Blank sample - oxidation with
into
Contaminated Liquid before
isopropyl
oxidation with surface
DM water
Extract
flame ignition alcohol (7,5%)
extract
w ater)
6,45
6,14
5,65
3,71
2,21
<0,1
<0,1
5
66700
7,5
18,3
52,4
50,3
878
<10
<10
<10
80
0,87
20
0,139
<0,1
1,36
0,371
0,666
1200
5,26
5,15
93
1000
<0,01
<0,01
0,0136
0,4
2,74
0,43
0,394
0,5
99,99 %
23. Action 4 – Technology assessment
SCWO results
Air emission
during the
oxidation with
isopropyl
alcohol (7,5%)
2nd TEST
vapour water
TVOC
Air emission
during the
oxidation with
contaminated
extract
%
<1
8,4
Emission (com bustion
limit
plant w ith
D.Lgs
w aste
152/2006 incinerator)
<1
mg/Nmc
Emission
limit Dlgs
133/2005
9,3
O2
% v/v
9
4,7
CO2
% v/v
8,77
11,77
CO
mg/Nmc
156
14,2
100
NOx
mg/Nmc
<0,1
<0,1
200
SO2
mg/Nmc
4,2
1,5
200
single PAH congeners
ng/Nmc
<2
Σ PAH - upper bound
ng/Nmc
25
100.000
10.000
0,003
2,4
10.000
500.000
0,1
Σ PCDD+PCDF - upper bound ng/Nmc (I-TEQ)
ng/Nmc
Σ PCB - dioxin upper bound
24. Action 4 – Technology assessment
Conclusions
• EXPECTED RESULTS:
extraction efficiency should be higher than 90% (SFE) and
over 90 % of efficiency in oxidation (SCWO) of target
organic compounds;
improvement (by 30’-60’) of kinetic rates of
extraction/oxidation of target organic compounds;
end-products generated should be easily managed and
discharged without further expensive or complex treatment;
possibility to realize compact equipment, easy to transport
and to install in the intervention sites;
practical guidelines on optimal use of prototype
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