Successful Applications of
®
(Patent pending)
(Electro Bio-Remediation)
Technology for Remediation of
Volatile Organic Compound in Groundwater
In-Situ Bioremediation
• In-situ bioremediation is an adjustable technology, implemented in many environments.
• Common treatment for aerobic remediation of MTBE and Benzene.
• Current application: External gas delivery techniques (AS, SVE).
• Limiting factors: Oxygen levels, nutrients availability, OPR control, site permeability
conditions and oxygen loss to unsaturated zone.
® (Electro-Bio Remediation) Patent pending
Is a technology that produces oxidants in-situ
® Patent pending
Patent pending
Computerized controller
Electrolytic cells for O2 production
Electrolytic cells for H2O2 production
Electrolytic cells for Fe2+ production
Probes: ORP, EC, pH, DO, Temp
Computerized controller
In-situ Preliminary site review
• Data collection from the groundwater by a computerized
controller during two weeks: ORP, DO, EC, pH, Temp and [Fe2+ ]
•Data processing and determination of remediation program
Reactor activation
O2 production
Computerized control: ORP, DO, EC, pH, and Temp
H2O2 production
Fe2+ production
2H2O → O2 + 4H+ + 4eORP > 450 mV
Fe(s) →2e- + Fe2+(aq)
O2 + 2H+ + 2e- → H2O2 → OH. + OH-
→
CO2+ H2O
RCL
→
→
Fe(s) →2e- + Fe2+(aq)
R
→
Hydrocarbons
→
H2O2 production
Fe2+ production
O2 + 2H+ + 2e- → H2O2 → OH. + OH- → Cl-
Laboratory Analysis
Concentration of BTEX, MTBE, TBA,
chlorinated solvents
Reactor activation
•O2 Production
•ORP control
Laboratory Analysis: concentration of
metabolites and/or CSIA
(compound specific isotope analysis)
END
2H2O → O2 +4H + + 4e Computerized system control ORP
100 mV
450 mV
• Elevating in situ Oxidants - O2 and H2O2.
• Fe+2 in situ production by electrolytic cells.
• Controlling ORP level.
• No external gas delivery.
• Low energy costs.
• No depth limitation.
Patent pending
N
5
1
Legend
EBR® reactor
6
8
Reactor
MTBE
(mg/L)
1
20
2
6
3
12
5
20
6
19
7
4.8
8
0.4
7
3
2
UST
Dispensers
flow direction
North-West
EBR® reactors layout and MTBE concentration BEFORE treatment
® Patent pending
5m
After less than 1 year MTBE Concentrations reduced significantly!
N
® Patent pending
UST
4R
1R
5
13m
3
7/2011
11/2012
1
2
3
4
5
37.5
45
4.4
1.2
11
<0.005
0.01
0.035
<0.005
<0.005
Dispensers
Groundwater
flow
Well
2R
* MCL in groundwater = 0.04 mg/L
Significant of MTBE Breakdown occurred after 1-2 years!!
® Patent pending
Aerobic and Oxidizing conditions
Biological Breakdown
®
1. EBR® system application in groundwater reduces MTBE &
petroleum compounds concentrations below target levels.
2. Isotopic fractionation support bio-reduction mechanism occurrence
of MTBE and other petroleum compounds.
3. End of remediation in gas station was achieved within two years.
® Patent pending
Pre-treatment water quality (µg/L)
Sampling
MCL
TCE
1079
20
PCE
9912
10
C 1,2- DCE
1840
50
VC
6
0.5
® Patent pending
Elgressy Laboratory
Colona
Treatment
1
Reactor &
Polluted soil from site
2
Reactor &
Iron pieces
3
Reactor &
Electro-generated Fe2+
4
Control
Fenton reaction
Fe(s) →2e- + Fe2+(aq)
O2 + 2H+ + 2e- → H2O2 → OH.+ OH-
RCl
→ CO2+ H2O
® Patent pending
Final Remediation results (µg/L) for each treatment after 14h:
After 14 hours of E.F activation concentration of all chlorinated solvents were
reduced up to 3 magnitude of order.
High efficiency of EBR® Fenton process was also recorded in a site with similar
contaminated compounds.
1. EBR® provides a remediation solution for hydrocarbons in soil and
groundwater.
2. The EBR® system is capable to degrade pollutants values below target
levels in a relatively short time frame.
3. The EBR® solution characterized with an ability to control the reduction
processes and to avoid production of hazardous by-products.
4. The system is easy to install and cost effective.
E.ELGRESSY ltd
www.elgressy-international.com
[email protected]