2015 Presentation
Utilizing an In Situ Groundwater Recirculation Bioremediation Process to Remediate a Hydrocarbon Release on an Active Oil Production Pad, North Dakota
PRESENTER: Eric Bueltel, P.E. E-MAIL: [email protected]
PHONE: 971-222-3616 x104
ETEC, LLC - Recirculation-Based Remediation Strategies
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Introduction: ETEC, LLC
Bioremediation technologies Role in cleanup
Process Overview: Conceptual model Equipment & products
Roadmap
ETEC Bioremediation
E-MAIL: [email protected] PHONE: 971-222-3616 x104
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Setup: Site Characteristics Flow rates Infrastructure Mass balance Obstacles
Operation: Process Data evaluation Treatment modifications
Roadmap Continued
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
ETEC, LLC Providing bioremediation services since 1991 Started landfarming Exxon Valdez shoreline soil Been providing in situ treatments since 1997 Projects throughout North America include:
Upstream Midstream Downstream Retail
Introduction
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
For petroleum: Dissolved Oxygen In situ Treatment (DO-ITTM) Super-OxTM oxygenation equipment PetroBacTM biological products & CBNTM Nutrients PetroSolvTM biosurfactant
For chlorinated solvents In Situ Delivery (ISDTM) groundwater recirculation
equipment CarBstrateTM nutrient-amended, soluble substrate
Introduction - Technologies
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Innovative Technology Provider ETEC is partner with remediation consultants
Help provide setup & planning for remediation treatments Manufacture equipment & products for remediation Evaluate client-collected data Recommend treatment modifications Onsite assistance if requested
ETEC is not An environmental consultant An installation contractor
Introduction – Role in Cleanups
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Dissolved Oxygen In situ Treatment (DO-ITTM) The DO-ITTM system uses groundwater recirculation to
distribute Dissolved oxygen Bioremediation amendments Nutrients & electron acceptors Surfactants
Provide hydraulic control & capture Achieve mass balance requirements Combine multiple remediation technologies
Process Overview - Conceptual
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1) It’s All About Delivery!!! Why automated equipment systems provide powerful delivery platforms to support site-wide biological degradation of target contaminants. APPLICATION/ENGINEERING
Roadmap
2) Fundamentals of Enhanced In Situ Bioremediation: An overview of the laws that
govern biological degradation of organic compounds.
SCIENCE 3) Case Studies: Field applications of the
technology/approach. RESULTS
Surfactants & Chemical OxidantsOxygenated Water
NutrientsSubstrates (Electron Donors)
DIRECTCONTACT
REMEDIATION SUCCESS DEPENDS ON:
1. Physical Contact2. Mass Balance
ETEC, LLC - Recirculation-Based Remediation Strategies
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Process Overview - Conceptual
Super-Ox ™ systems provide:
24/7 electron acceptor &
amendment delivery
Optimum contact via pore
volume exchanges
Managed in situ environment for
accelerated microbial
activity
Hydraulic capture and
plume control Aerobic Bioremediation
UST
BedrockExtraction well
Gas Station
UST
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Super-OxTM Oxygenation Equipment Specifications
10-gpm recirculation rate 45-ppm dissolved oxygen process water Metering for biological products, nutrients, & surfactants Up to 12 customizable injection areas Up to 6 integrated groundwater pumps Activated carbon pre-treatment controls Fully weatherized 8’x10’ building 220V 100-amp
Process Overview - Equipment
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Super-OxTM Oxygenation Equipment
Process Overview - Equipment
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Process Overview - Equipment
ETEC, LLC - Recirculation-Based Remediation Strategies
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Process Overview - Products
Biological Products PetroBacTM biological amendments
Active cultures of hydrocarbon-degrading bacteria Enzyme enhancements to increase bioavailability
CBNTM nutrients Supplies nitrogen, phosphorus & micronutrients Contains over 60% electron acceptors (nitrate, sulfate)
PetroSolvTM
Non-ionic surfactant for free-product & residual mobilization
Surfactant-Enhanced Remediation
E-MAIL: [email protected] PHONE: 971-222-3616 x104
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Active production pad - western North Dakota Older pad (est. 1989) with major release 2010
Site-wide LNAPL (0.01 – 1.9 feet) Operated LNAPL recovery system from 2011-2014
Contaminant Concentrations LNAPL still present in 3 MWs (<0.2 feet) Benzene in groundwater (<500 µg/L to 5,000 µg/L) TPH up to 5 mg/L
Setup – Site Characteristics
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Active production pad - western North Dakota Hydrogeology
Silty clay from surface to 3-4 feet bgs Silty sand & gravelly sand from 9-15 feet bgs Lower confining unit
Target Plume Zone Onsite infrastructure measures 250 feet x 175 feet Offsite infrastructure included MWs 100 feet downgradient
Remediation Goals 5 µg/L benzene, 0.5 mg/L TPH
Setup – Site Characteristics
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Setup – Site Characteristics
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
LNAPL Thickness
Setup – Site Characteristics
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Benzene Concentrations
Setup – Site Characteristics
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
TPH Concentrations
Setup – Site Characteristics
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Flow Rates Pilot study – 30 feet x 30 feet 1 well surfactant recirculation over 2 days
RW-9 used for extraction Surrounding wells used for simultaneous injection Recirculated 3,000 gallons
Flow rate observed was 3-gpm from one well Full-scale flow rate estimated to be 6- to 9-gpm (2 wells)
Setup - Flow Rates
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Onsite Infrastructure Injection trenches
Four 50-foot long injection trenches Gravel-lined & cover with impermeable barrier Installed 4-5 feet bgs (at top of the smear zone soil) Individually piped for flow control
Recovery wells Utilized 2 existing recovery wells for process water Screened 3-15 feet bgs Originally used for LNAPL recovery system
Setup - Infrastructure
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Setup – Site Characteristics
Distal End 1st to treat offsite benzene, impacts
to surface water
Injection Trenches 50 ft long, 4-5 ft bgs.
Retrofitted old recovery system piping/conduit
2 Extraction Wells
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Setup - Infrastructure
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Contaminant Mass – Phase 1 area TPH mass estimated at more than 500 lbs. TPH
Using Contaminant Mass for Calculating Nutrient Needs Breakdown of 500 lb. of TPH requires
100 lb. nitrogen 25 lb. phosphorus
Using Contaminant Mass for Calculating Electron Acceptor Needs Breakdown of 500 lb. of TPH requires
500 lb. TPH * 3 lb. O2 / 1 lb. TPH = 1,500 lb. oxygen 500 lb. TPH * 5 lb. NO3
- / 1 lb. TPH = 2,500 lb. (nitrate/sulfate)
Setup - Mass Balance
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Setup Obstacles Miles of onsite piping for production activities
Required compliance w/ Pipeline Corrosion Standard (4,000 µS/cm) ETEC installed metering system for biological products Testing to ensure injectate / groundwater did not exceed standard
Limited infrastructure placement
Inclement weather Robust weatherization Intermittent season operation
Setup - Obstacles
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Startup 9/2014 Initial amendments applied
50 gallons of microbial consortium (PetroBacTM) 150 gallons of surfactant (PetroSolvTM) 500 lbs. nutrients (CBNTM)
Monthly amendments applied 15 gallons of microbial consortium (PetroBacTM) 15 gallons of surfactant (PetroSolvTM) 500 lbs. nutrients (CBNTM)
Operation - Process
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Winter Shutdown 11/2014 Operated for 6 weeks
Average 3- to 5-gpm recirculation rate 225,000 gallons recirculated Added 85 lbs. dissolved oxygen Added 900 lbs. nitrate/sulfate
Weekly site visits by consulting partner (1-2 hours)
Operation - Process
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Phase 1 - Downgradient Wells
Results
Action Level 5 0.5 Date Benzene (µg/L) TPH-D (mg/L)
MW-4 6/14/2012 1390 <0.21 12/5/2012 1280 <0.20 3/12/2013 1360 <0.21 7/30/2013 857 NA
Baseline 8/20/2014 344 <0.19Shutdown 11/17/2014 <0.50 0.34
MW-11 12/5/2012 617 <0.20
3/12/2013 974 <0.21 7/30/2013 199 NA
Baseline 8/21/2014 981 0.288Shutdown 11/17/2014 26.6 0.372
MW-12 12/5/2012 3000 <0.20
7/30/2013 2870 NABaseline 8/21/2014 6.7 <0.19
Shutdown 11/17/2014 0.52 0.279
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Setup – Site Characteristics
Phase 1 Implemented
Phase 2 Implemented
Phase 3 Planned
Injection Trenches 50 ft long, 4-5 ft bgs.
Retrofitted old recovery system piping/conduit
2 Extraction Wells
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Spring Startup 4/2015 Phase 1 & 2 implemented
Dewatered treatment zone due to dry conditions Operated when water was available Shutdown & weatherized 11/2015 Treatment will resume Spring 2016
Results
ETEC, LLC - Recirculation-Based Remediation Strategies
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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ETEC Bioremediation
Phase 1 – Excellent results in first 6 weeks of operation Phase 2 in process Operation Successes
Recirculated 225,000 gallons during 6 weeks operation Observed excellent distribution between injection/extraction wells Were able to add large masses of products while remaining below
pipeline corrosion standard (µS/cm)
Phase 1 & 2 will resume Spring 2016
Summary
ETEC, LLC - Recirculation-Based Remediation Strategies
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Summary
Aerobic Bioremediation
Eric Bueltel, P.E.Project Manager - ColoradoETEC, LLC971-222-3616 [email protected]
www.etecllc.com/movie
E-MAIL: [email protected] PHONE: 971-222-3616 x104
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