2015 presentation utilizing an in situ groundwater recirculation bioremediation process to remediate...

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

mailto:[email protected]

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



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ETEC Bioremediation

Setup: Site Characteristics Flow rates Infrastructure Mass balance Obstacles

Operation: Process Data evaluation Treatment modifications

Roadmap Continued



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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



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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



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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



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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


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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



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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



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ETEC Bioremediation

Super-OxTM Oxygenation Equipment




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ETEC Bioremediation



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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




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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



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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




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ETEC Bioremediation




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ETEC Bioremediation

LNAPL Thickness




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ETEC Bioremediation

Benzene Concentrations




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ETEC Bioremediation

TPH Concentrations




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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



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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



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ETEC Bioremediation


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



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ETEC Bioremediation

Setup - Infrastructure



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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



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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



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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



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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



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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



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ETEC Bioremediation


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



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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



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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


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Summary

Aerobic Bioremediation

Eric Bueltel, P.E.Project Manager - ColoradoETEC, LLC971-222-3616 [email protected]

www.etecllc.com/movie


mailto:[email protected]

http://www.etecllc.com/movie

2015 presentation utilizing an in situ groundwater recirculation bioremediation process to remediate...

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