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Hydrogen Release Compound, HRC R A Timely, Cost-Effective Solution for Treating Chlorinated Solvents in Groundwater Accelerated Anaerobic Natural Attenuation.

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Presentation on theme: "Hydrogen Release Compound, HRC R A Timely, Cost-Effective Solution for Treating Chlorinated Solvents in Groundwater Accelerated Anaerobic Natural Attenuation."— Presentation transcript:

1 Hydrogen Release Compound, HRC R A Timely, Cost-Effective Solution for Treating Chlorinated Solvents in Groundwater Accelerated Anaerobic Natural Attenuation

2 What Is Reductive Dechlorination? HRC provides the hydrogen necessary for accelerating reductive dechlorinationHRC provides the hydrogen necessary for accelerating reductive dechlorination Reductive Dechlorination:Reductive Dechlorination: –Microbes called “reductive dechlorinators” replace chlorine with hydrogen atoms on CHs –PCE is biodegraded via the following sequence: PCE TCE DCE VC Ethene PCE TCE DCE VC Ethene

3 HRC is a polylactate esterHRC is a polylactate ester When hydrated, HRC time-releases lactic acidWhen hydrated, HRC time-releases lactic acid HRC accelerates anaerobic bioremediation of CHs such as PCE, TCE, and TCAHRC accelerates anaerobic bioremediation of CHs such as PCE, TCE, and TCA –Microbes metabolize lactic acid to other organic acid intermediates, such as acetic acid –Hydrogen is released as a by-product –This hydrogen facilitates reductive dechlorination of chlorinated hydrocarbons Hydrogen Release Compound, HRC R

4 HRC Polylactate Ester Structure Time-Release Formula HRC is based on a three-carbon glycerol polylactate ester structure:HRC is based on a three-carbon glycerol polylactate ester structure: HRC releases lactic acid for up to one yearHRC releases lactic acid for up to one year By providing a long- lasting, time-released hydrogen source, HRC cost-effectively accelerates anaerobic reductive dechlorinationBy providing a long- lasting, time-released hydrogen source, HRC cost-effectively accelerates anaerobic reductive dechlorination

5 Benefits of HRC’s Time-Release Feature Rapid Site Closure - Accelerates natural attenuation by 10X to 100X— reducing time to site closure Cost-Effective - No capital costs for systems - No operation & maintenance costs - Reduced installation costs

6 Benefits of HRC’s Time-Release Feature Non-invasive In-situ technology minimizes physical disturbance to propertyIn-situ technology minimizes physical disturbance to property No “iron wall” –type constructionNo “iron wall” –type construction Wide regulatory acceptance environmentally safeenvironmentally safe Proven technology Demonstrated on USEPA SITE program siteDemonstrated on USEPA SITE program site Installed on >120 sitesInstalled on >120 sites

7 Distribution of HRC HRC is both “static” and slowly soluble. It stays in place as it releases lactic acid.HRC is both “static” and slowly soluble. It stays in place as it releases lactic acid. High initial concentrations of lactic acid drive the distribution of the material by diffusion – even in stiff clays!High initial concentrations of lactic acid drive the distribution of the material by diffusion – even in stiff clays!

8 Distribution of HRC in the Aquifer Laboratory and field work indicate that lactic acid will move by diffusion alone about 10 ft/yr regardless of aquifer matrix material.Laboratory and field work indicate that lactic acid will move by diffusion alone about 10 ft/yr regardless of aquifer matrix material. Recommended spacing of HRC application points is on the order of ten foot on center.Recommended spacing of HRC application points is on the order of ten foot on center.

9 Longevity of HRC The degree of complexity and esterification of the molecule are key factors in its longevityThe degree of complexity and esterification of the molecule are key factors in its longevity

10 Structure of HRC

11 Longevity of HRC- “How long does it last?” Longevity is a function of certain biological and geochemical features of the aquiferLongevity is a function of certain biological and geochemical features of the aquifer -microbial population -groundwater flow rate HRC stimulates reductive dechlorination within the aquifer for about 12 month’s time.HRC stimulates reductive dechlorination within the aquifer for about 12 month’s time.

12 Compounds Treatable With HRC Chlorinated Organics (ethenes, ethanes, etc.)Chlorinated Organics (ethenes, ethanes, etc.) Chlorinated Pesticides and HerbicidesChlorinated Pesticides and Herbicides NitrateNitrate ChromiumChromium PerchloratesPerchlorates ExplosivesExplosives

13 Advantages of HRC Compared to Pump and Treat No capital equipment costsNo capital equipment costs No elaborate design costsNo elaborate design costs No site construction/ disruptionNo site construction/ disruption No Operation and Maintenance CostsNo Operation and Maintenance Costs HRC treatment is generally <1/3 the cost of pump and treat systems

14 Advantages of HRC Compared to Sparging/Venting No capital equipment costsNo capital equipment costs No elaborate design costsNo elaborate design costs No site construction/ disruptionNo site construction/ disruption No Operation and Maintenance costsNo Operation and Maintenance costs HRC treatment is generally <1/2 the cost of sparge/vent systems

15 Advantages of HRC Compared to Sparge/Venting HRC Accelerates Natural Attenuation. Sparging Inhibits it.HRC Accelerates Natural Attenuation. Sparging Inhibits it.

16 Advantages of HRC Compared to Zero Valent Iron No construction costsNo construction costs No patent fees (15% of the project)No patent fees (15% of the project) No site construction/ disruptionNo site construction/ disruption Iron walls are circumvented by flowIron walls are circumvented by flow Iron walls foulIron walls foul HRC treatment is generally <1/3 the cost of iron walls

17 Advantages of HRC Compared to Chemical Oxidation Fenton’s Reagent and Permanganate require direct contact with contaminant- requiring wells on very close spacing- very high costFenton’s Reagent and Permanganate require direct contact with contaminant- requiring wells on very close spacing- very high cost Very dangerousVery dangerous Large quantities of oxidants are required- often contaminating subsurface (ie. manganese)Large quantities of oxidants are required- often contaminating subsurface (ie. manganese) Chemical oxidants can release toxic metals into groundwater (eg. hex-chrome)Chemical oxidants can release toxic metals into groundwater (eg. hex-chrome)

18 Advantages of HRC Compared to Chemical Oxidation Chem Ox inhibits natural attenuation of chlorinated compoundsChem Ox inhibits natural attenuation of chlorinated compounds Permanganate can encapsulate DNAPL inhibiting degradationPermanganate can encapsulate DNAPL inhibiting degradation HRC simply stimulates rapid dechlorination without any negative site effects.HRC simply stimulates rapid dechlorination without any negative site effects. HRC is generally <1/3 the cost of chem ox

19 Advantages of HRC Compared to Chemical Oxidation HRC can be used to restore natural attenuation in areas where chem ox has been usedHRC can be used to restore natural attenuation in areas where chem ox has been used

20 Advantages of HRC Compared to Organic Substrate Additions Soluble substrate additions (molasses, sugar, lactate, etc.):Soluble substrate additions (molasses, sugar, lactate, etc.): – Require costly routine applications due to high solubility – Require multiple wells for routine re-injection –Constantly bio-foul *Favor methanogenesis over dechlorination

21 Advantages of HRC Compared to Organic Substrate Additions Insoluble substrate additions (Oils, chitin,etc.): – Require very dense placement due to insolubility –Large quantities are required to treat plume due to low solubility – Oils partition into contaminant, inhibiting dechlorination

22 Advantages of HRC Compared to Organic Substrate Additions HRC presents a very low cost, diffusable, reliable treatment option compared to common substrate additions. HRC is generally <1/2 the cost of typical substrate addition programs

23 HRC Site Objectives Containment - inject HRC at downgradient edge of plume to prevent off-site migration- ”cost effective PRB”Containment - inject HRC at downgradient edge of plume to prevent off-site migration- ”cost effective PRB” Saturated Zone Source/Plume Treatment - apply HRC near source area or in plume to:Saturated Zone Source/Plume Treatment - apply HRC near source area or in plume to: –Degrade plume contaminants –Desorb and Degrade source mass

24 Source Treatment HRC Barrier H2H2 H2H2 Tank Removal or Excavation Application Dissolved Phase Contamination Methods of HRC Application Groundwater Flow Direction

25 HRC Cost Comparison #1 Assumes TCE plume 10ppm PLUME WIDE REMEDIATION TECHNOLOGY COST COMPARISON Small Site (50’ x 75’)Large Site (200’ x 200’) Shallow 20’ bgsDeep 50’ bgsShallow 20’ bgsDeep 50’ bgs HRC Treatment $ 127,000$ 135,000$ 303,000$ 343,000 Pump & Treat $ 595,000$ 633,000$ 778,000$ 876,000 Air Sparging w/SVE $ 480,000$ 515,000$ 890,000$1,068,000 Chemical Oxidation $ 320,000$ 343,500$ 1,495,000$ 1,636,000

26 HRC Cost Comparison #2 Assumes TCE 10ppm PLUME CUT-OFF BARRIER TECHNOLOGY COST COMPARISON Small Site (50’ x 75’)Large Site (200’ x 200’) Shallow 20’ bgsDeep 50’ bgsShallow 20’ bgsDeep 50’ bgs HRC Treatment $ 145,000 $ 175,000 Iron Wall PRB $ 336,914$ 394,514$ 632,586$ 776,586 Pump and Treat $ 578,945$ 615,265$ 685,893$ 757,443 Air Sparging with SVE $ 350,825$ 356,525$ 641,767$ 675,017

27 The Advantages of HRC: Compared to Organic Substrate Additions Insoluble substrate additions (Oils, chitin,etc.): – Require very dense placement due to insolubility –Large quantities are required to treat plume due to low solubility – Oils partition into contaminant, inhibiting dechlorination

28 The Advantages of HRC: Compared to Organic Substrate Additions (continued) Soluble substrate additions (molasses, sugar, lactate, etc.):Soluble substrate additions (molasses, sugar, lactate, etc.): – Require costly routine applications due to high solubility – Require multiple wells for routine re-injection –Constantly bio-foul

29 The Advantages of HRC: Compared to Organic Substrate Additions (continued) HRC presents a very low cost, diffusible, reliable treatment option compared to common substrate additions. HRC is generally <1/2 the cost of typical substrate addition programs

30 HRC is injected into the aquifer using direct-push technologies. HRC Field Application HRC is a viscous, injectable substance.

31 HRC APPLICATION CASE HISTORIES

32 Recirculating Well Study USEPA SITE Program HRC canisters were inserted into injection wellsHRC canisters were inserted into injection wells Circulation was maintained between the extraction and reinjection wellsCirculation was maintained between the extraction and reinjection wells The efficacy of HRC was tested in a recirculation well as part of USEPA SITE Program Injection wells Extraction wells

33 Pump off-line Pump Shut Off

34 Recirculating Well Study: Results Total contaminant mass decreased 97% by Day 206Total contaminant mass decreased 97% by Day 206 Initial Conc. (ppb) Conc. Day 206 TCE VC DCE PCE740 < 10 9,900 < 1 2,500 < AverageAverage Vinyl chloride levels rose from an average of 250 ppb to 3,000 ppb as TCE and DCE decreased -- a strong indication of accelerated reductive dechlorination. By Day 206, VC levels were reduced to <100 ppb.Vinyl chloride levels rose from an average of 250 ppb to 3,000 ppb as TCE and DCE decreased -- a strong indication of accelerated reductive dechlorination. By Day 206, VC levels were reduced to <100 ppb.

35 Site Characteristics and Application Dry-cleaning operation in commercial location Dry-cleaning operation in commercial location Contaminated with high PCE levels (up to ppm) Contaminated with high PCE levels (up to ppm) Sandy aquifer, groundwater velocity ft/day Sandy aquifer, groundwater velocity ft/day 240 lbs. of HRC injected via 12 direct-push points in a 240 lbs. of HRC injected via 12 direct-push points in a 60 ft 2 area 60 ft 2 area HRC Field Demonstration in Wisconsin

36 HRC Field Demonstration in WI: Site Map

37 PCE mass decreased 80% PCE mass decreased 80% – Concentration ranges across site decreased from ppm to ppm in 9 months from ppm to ppm in 9 months TCE and DCE increased in the first 120 days before TCE and DCE increased in the first 120 days before onset of subsequent degradation to VC and ethene onset of subsequent degradation to VC and ethene Sulfate mass decreased 65% Sulfate mass decreased 65% Redox decreased throughout treatment area Redox decreased throughout treatment area Vinyl chloride was detected and presumed to be Vinyl chloride was detected and presumed to be degrading continuously as concentrations averaged degrading continuously as concentrations averaged only 1.32 ppb after nine months of treatment only 1.32 ppb after nine months of treatment HRC Field Demonstration in WI (Results)

38

39 PCE Mass Reduction Upon HRC Application GWFlow

40 Daughter Product TCE Increases and Decreases GWFlow

41 Daughter Product DCE Increases and Decreases Daughter Product DCE Increases and Decreases GWFlow

42 HRC Field Demonstration in WI HRC Injection Diagram Overlaying Hydrogen Concentration Map at Day 149 HRC Application results in increased hydrogen concentrations in the aquifer: 2-8 nM

43 INSERT CASE STUDY AS NEEDED (Cleaners No.1 was here)

44 Is HRC right for your project? Follow these steps to find out Step #1 – Contact Regenesis Technical Support for a free site evaluation, cost estimate and proposal.Step #1 – Contact Regenesis Technical Support for a free site evaluation, cost estimate and proposal. Step #2 – Evaluate free HRC Proposal, determine if it meets your requirements and goalsStep #2 – Evaluate free HRC Proposal, determine if it meets your requirements and goals Step #3 – If so, you can order HRC directly from Regenesis over the phone at (949) Step #3 – If so, you can order HRC directly from Regenesis over the phone at (949)

45 Steps to obtaining HRC - contn’d Step #4 - HRC is typically shipped by truck, and is delivered in 30 lb. buckets *Note: MSDS and installation instructions are supplied. Step #5 - Receive product and apply to your site.

46 REGENESIS SUPPORT Regenesis offers support free of charge: ORC engineering/design servicesORC engineering/design services ORC application/installation tech supportORC application/installation tech support Technical Bulletins withTechnical Bulletins with Case StudiesCase Studies Peer-reviewed LiteraturePeer-reviewed Literature Download the Applications and Real Estate SoftwareDownload the Applications and Real Estate Software

47 For More Information please contact us at: (949) California, USA or go to


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