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Hydrogen Release Compound, HRCR

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Presentation on theme: "Hydrogen Release Compound, HRCR"— Presentation transcript:

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

2 What Is Reductive Dechlorination?
HRC provides the hydrogen necessary for accelerating 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

3 Hydrogen Release Compound, HRCR
HRC is a polylactate ester When hydrated, HRC time-releases lactic acid HRC 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

4 HRC Polylactate Ester Structure
Time-Release Formula HRC is based on a three-carbon glycerol polylactate ester structure: HRC releases lactic acid for up to one year By 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 property No “iron wall” –type construction Wide regulatory acceptance environmentally safe Proven technology Demonstrated on USEPA SITE program site Installed on >120 sites

7 Distribution of HRC 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!

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. 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 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 aquifer -microbial population -groundwater flow rate HRC stimulates reductive dechlorination within the aquifer for about 12 month’s time.

12 Compounds Treatable With HRC
Chlorinated Organics (ethenes, ethanes, etc.) Chlorinated Pesticides and Herbicides Nitrate Chromium Perchlorates Explosives

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

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

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

16 Compared to Zero Valent Iron
Advantages of HRC Compared to Zero Valent Iron No construction costs No patent fees (15% of the project) No site construction/ disruption Iron walls are circumvented by flow Iron walls foul HRC treatment is generally <1/3 the cost of iron walls The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

17 Compared to Chemical Oxidation
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 cost Very dangerous Large quantities of oxidants are required- often contaminating subsurface (ie. manganese) Chemical oxidants can release toxic metals into groundwater (eg. hex-chrome) The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

18 Compared to Chemical Oxidation
Advantages of HRC Compared to Chemical Oxidation Chem Ox inhibits natural attenuation of chlorinated compounds Permanganate can encapsulate DNAPL inhibiting degradation HRC simply stimulates rapid dechlorination without any negative site effects. HRC is generally <1/3 the cost of chem ox The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

19 Compared to Chemical Oxidation
Advantages of HRC Compared to Chemical Oxidation HRC can be used to restore natural attenuation in areas where chem ox has been used The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

20 Compared to Organic Substrate Additions
Advantages of HRC Compared to Organic Substrate Additions 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 The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

21 Compared to Organic Substrate Additions
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 The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

22 Compared to Organic Substrate Additions
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 The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

23 HRC Site Objectives 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: Degrade plume contaminants Desorb and Degrade source mass

24 Methods of HRC Application Tank Removal or Excavation
Source Treatment HRC Barrier Tank Removal or Excavation Application H2 Dissolved Phase Contamination H2 Groundwater Flow Direction

25 HRC Cost Comparison #1 Assumes TCE plume treatment @ 10ppm
PLUME WIDE REMEDIATION TECHNOLOGY COST COMPARISON Small Site (50’ x 75’) Large Site (200’ x 200’) Shallow 20’ bgs Deep 50’ bgs Shallow 20’ bgs Deep 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 plume @ 10ppm
PLUME CUT-OFF BARRIER TECHNOLOGY COST COMPARISON Small Site (50’ x 75’) Large Site (200’ x 200’) Shallow 20’ bgs Deep 50’ bgs Shallow 20’ bgs Deep 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 Compared to Organic Substrate Additions
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 The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

28 Compared to Organic Substrate Additions
The Advantages of HRC: Compared to Organic Substrate Additions (continued) 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 The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

29 Compared to Organic Substrate Additions
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 The patent for zero valent iron dechlorination is enforced. They charge a 15% royalty of the cost of the project! Not the metal used. This is an additional 15% right off the top.

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

31 HRC APPLICATION CASE HISTORIES

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

33 Pump off-line Pump off-line Pump Shut Off

34 Recirculating Well Study: Results
Total contaminant mass decreased 97% by Day 206 Initial Conc. (ppb) Conc. Day 206 Average Average PCE 740 < 1 TCE 9,900 < 10 DCE 2,500 < 100 VC 250 < 100 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 HRC Field Demonstration in Wisconsin
Site Characteristics and Application Dry-cleaning operation in commercial location Contaminated with high PCE levels (up to ppm) Sandy aquifer, groundwater velocity ft/day 240 lbs. of HRC injected via 12 direct-push points in a 60 ft2 area

36 HRC Field Demonstration in WI: Site Map

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

38

39 PCE Mass Reduction Upon HRC Application
GW Flow

40 Daughter Product TCE Increases and Decreases
GW Flow

41 Daughter Product DCE Increases and Decreases
GW Flow

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)
- Env. Associates applied for closure for this site

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 #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)

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 services ORC application/installation tech support Technical Bulletins with Case Studies Peer-reviewed Literature Download the Applications and Real Estate Software

47 For More Information (949)366-8000 California, USA www.regenesis.com
please contact us at: (949) California, USA or go to


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