MECX ISCO at EPA Brownfield Nov 2005

IN-SITU CHEMICAL OXIDATION
FOR RAPID RESTORATION OF
BROWNFIELDS
By:
Isaac M. Aboulafia, P.E.
Presented at:
Environmental Protection Agency
2005 National Brownfields Association Conference
Denver, Colorado
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX Overview
• Employee-owned, <30 employees
• Formerly ManTech Environmental Corporation (USEPA Kerr Lab)
• Provider of innovative remediation solutions
• ISCO technology partners: FMC Active Oxidants, Solvay, US
Peroxide, Carus Chemical
• Offices in Columbia, MD; Williamsburg, VA; Irvine, CA; Chicago,
IL and headquarters in Houston, TX
•
Service-Disabled Veteran-Owned Small Business
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
Remediation Challenges
• Get ‘er done………Now! Cost-Effectively! Permanently!
• Site logistics/operations, geology, NAPL
• Drivers
Driving Factor
Technology
Cost
Biological Enhancements,
Mass Transfer (SVE,
Sparging)
Time
In-Situ Chemical Oxidation
Process Optimization ISCO combined with Biological
Enhancement
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
Critical Factors for ISCO
• Site characterization…spend the time & money
• Optimization by continuous refinement
- Initial technology screening
- Modeling/OET© & Treatability Evaluation
- Initial field application/pilot
- Full-scale application
• Contact, contact, contact
• Monitoring
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
Chemical Oxidant Screening
Goals:
- Desorbtion? Persistence?
- Hydraulic control/containment?
- MCLs vs. Mass Reduction?
- Proper oxidant selection?
Oxidant
Hydrofluoric Acid (HF)
Hydroxyl Radical (OH•)
Sulfate Radical (SO4•)
Ozone (O3)
Sulfate (S2O8-2)
Hydrogen Peroxide (H2O2)
Permanganate (MnO4-)
Chlorine (Cl2)
Volts(1)
3.0
2.7
2.6
2.4
2.1
1.8
1.7
1.4
Note: (1) = Provided by FMC Corporation
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
Chemical Oxidation Overview
• Occurs effectively only in the saturated zone or in an artificially hydrated zone
• Alters the equilibrium conditions during and for a period after treatment
• Fenton’s:
H2O2 + Fe+2 Æ OH• + OH- + Fe+3 + OH• + Contaminant Æ CO2 + H2O
• Activated Persulfate:
activation
S2O82-
Æ 2SO4- ● SO4- ● + e- + Contaminant Æ SO42- + CO2 + H2O
Activation by: presence of a transition metal, heat, hydrogen peroxide, high pH
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
Pre-Field Lab Treatability
• Design basis
- Stochiometry
- Formation oxidant demand
- Geochemistry
- Experience
- Multiple formulations for efficiency & optimization
• The primary purposes of the tests are:
- Determine media reactivity
- Select optimum formulation
- Observe reactions
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
ISCO Field Optimization
• Goals
- Maximize radical generation
- Minimize contaminant migration
- Maximize oxidant distribution
- Desorb & oxidize
• Goals Achievement
- Real-time monitoring
* Temp < 180oF
* Pressure < 10 psig
- Hydraulic control
- Manage reaction by controlled application of reagents
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO Reagent Delivery
MECX Reagent
Distribution Manifold
MECX ISCO Wellhead
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO Process
Temperature Monitoring
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO - Oxidant Distribution
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO Contact
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO - UST Site
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO - Pipeline
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO - NAPL Reduction
0.30
T h ic k n e s s (ft)
0.25
0.25
MW-10
MW-11
0.20
0.15
0.10
0.05
-
0.09
0.08
0.02
Activated
Persulfate
Application
Oct-04
Nov-04
Dec-04
Jan-05
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
Feb-05
MECX ISCO - Former Cleaners
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO – Bulk Fuel Facility
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO - Military Installation
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
MECX ISCO - UST Site
Post-Remediation
Roadway Improvement
Schedule
Traffic
Shallow Groundwater
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
ISCO Application - UST Site
Fiber Optics
Sewers
Shallow
Groundwater
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
ISCO Application – Scrap Yard
Unpolymerized Styrene
Freezing chemical
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net
QUESTIONS?
Isaac M. Aboulafia, P.E.
Vice President
(281) 850-2153 cell
(713) 585-7008 office
(713) 585-7049 fax
MECX, LLC
A Service-Disabled Veteran Owned Small Business
3203 Audley Street
Phone: 713.585.7000
Houston, Texas 77098
www.mecx.net