up-front orders of magnitude reduction and accelerated bio ... · up-front orders of magnitude...
TRANSCRIPT
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up-front orders of magnitude reduction and accelerated bio-destruction using a dispersive injectable reagent
Webinar: “Case studies and first EU projects”broadcast live on 3 November 2015
To watch the webinar recording visit regenesis.com/gb/webinars/
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Principal technology features • Rapid reduc5on of groundwater concentra5ons • Mul%ple order of magnitude concentra%on reduc%ons in days / weeks
• Accelera5on of contaminant biodegrada5on • Elimina%on of low-‐concentra%on performance tailing • Ability to secure stringent clean-‐up targets
• Wide subsurface dispersion • Efficient fieldwork • Ability to address areas of restricted access, deep plumes etc.
• Long-‐term efficacy • The reagent is not consumed – it regenerates in situ
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• A highly dispersive, injectable sorbent and microbial growth matrix
• Sorbent • Rapid drop in dissolved-‐phase contaminant concentra%on • Immediate risk-‐reduc%on
• Microbial growth matrix • Accelerated bio-‐destruc%on of sorbed mass • Ability to secure clean-‐up to much lower targets
What it is
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• A highly dispersive, injectable sorbent and microbial growth matrix
• Sorbent • Rapid drop in dissolved-‐phase contaminant concentra%on • Immediate risk-‐reduc%on
• Microbial growth matrix • Accelerated bio-‐destruc%on of sorbed mass • Ability to secure clean-‐up to much lower targets
What it is
How does this work?
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Bio Basics: Availability and Threshold Concentrations
• Bacteria live on surfaces – biofilms • Think ‘sink plug-hole slime’ or ‘dental plaque’ rather than ‘tadpoles’
• They have to wait for their growth substrate (food) to come to them – they do not hunt• They must therefore either sit on / in the food source (rotting vegetables)
• Or wait for it to dissolve and come to them in solution (groundwater bioremediation)
• As the plume is progressively cleaned up, the contaminant concentration drops• The rate that substrate comes to the bacteria reduces
• The rate that bacteria can therefore degrade it reduces – first order kinetics / half-life degradation
• Furthermore, below a certain concentration, the rate can slow dramatically• Threshold concentrations (Smin) for microbial growth – sufficient energy for activity – ‘starvation’ boundary
• The threshold is variable but typically in the low µg/L range – therefore not relevant for every site
• This step change slow-down is in addition to first-order diminishing returns
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6,000 µg/L removed in first week
3,000 µg/L removed in second week
1,500 µg/L removed in third week
750 µg/L removed in fourth week 12.5% of initial weekly mass removal
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6,000 µg/L removed in first week
3,000 µg/L removed in second week
1,500 µg/L removed in third week
750 µg/L removed in fourth week 12.5% of initial weekly mass removal
What if this (linear) rate could continue at this lower concentration….?
So this is the general idea – although the top end is accelerated too
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• Colloidal ac%vated carbon (1 – 2 µm) • Size of a bacterium – suspends as ‘liquid’ • Huge surface area – extremely fast sorp%on
• Proprietary an%-‐clumping / distribu%on suppor%ng surface treatment (patent applied for) • Core innova%on • Enables wide-‐area, low-‐pressure distribu%on through the soil matrix without clogging
• Low-‐solubility / controlled availability matrix nutrients • Support in-‐matrix contaminant biodegrada%on • Does not impact groundwater / eutrophica%on
What the reagent is
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Fracture-emplaced PAC Dispersion-emplaced LAC
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Example in Use- Mixed Solvents -
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Case Study – Mixed VOC’s
• Former electronics facility • TCE 1,390 µg/L • TCA 3,550 µg/L
• Sand to silty-‐sand • Depth to groundwater 3 – 4 m • Seepage velocity 3.7 m/yr to the southwest
• Test site injec%on of PlumeStop™ and HRC®
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10 x reduc%on
100 x reduc%on
non-‐detect 1 year and coun%ng…
projected sorp%ve satura%on from influx
1000 x reduc%on
prolifera%on of VOC-‐degrading microflora -‐ dissolved-‐phase VOC at/close to ND -‐
18 months and coun%ng…
now >2 years…
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- Distribution through Soil -
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PlumeStop™: reagent distribution
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PlumeStop Powdered Ac%vated Carbon
PlumeStop™: reagent distribution
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PlumeStop Powdered Ac%vated Carbon
PlumeStop™: reagent distribution
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PlumeStop Powdered Ac%vated Carbon
PlumeStop™: reagent distribution
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PlumeStop Powdered Ac%vated Carbon
PlumeStop™: reagent distribution
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PlumeStop™: reagent distributionSEM image of sand particles without PlumeStop
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PlumeStop™: reagent distributionSEM image of sand particle coated with PlumeStop
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PlumeStop™: reagent distribution
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PlumeStop Distribu5on (Field-‐Prac5cal Distances)
• Long Column Study – 16 foot length (5m) (ID 2”; 5 cm) – Fine to medium silica sand (210 – 420 µm)
– 20% porosity (est.) (pore volume 0.5 gal; 2 L)
• Breakthrough dynamics • Retained carbon mass-‐balance
Influent
Effluent
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Front progresses through dispersive flow
Post-flush residual coating visibly apparent
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Clean chase-water Breakthrough at 1.2 PV
PlumeStop travelling >5 m
back-pressure / flow static – no permeability impact
PlumeStop applica5on (start/finish)
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PlumeStop Distribu5on – wash-‐out?
• Aggressive chase-‐water flushing – Nine pore volumes immediately post-‐applica%on
(PlumeStop dispersive treatment s%ll ac%ve)
– Equivalent seepage velocity of 35 km/year (22 miles/year)
• Sacrificial dissec%on of column – Broken into lengths and analyzed for elemental carbon
(corrected against clean-‐sand, pre-‐applica%on baseline)
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Influent
Effluent
Total mass retained within column < 0.1% of pore volume 1-2 µm coating on sand particles
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PlumeStop Distribu5on – Laboratory
Extreme-‐Case Test: • Low surface charge, low surface area matrix
– LAC reten%on on charged aquifer fines will be greater • High wash-‐out flux
– Volume and flow-‐rate >> field condi%ons – PlumeStop dispersive treatment longevity ca. 1 – 3 months
• Field-‐applica%on control opportuni%es – Volume, flow-‐rate, dilu%on, chase-‐water, injec%on spacing, dispersion adjustment….
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- Post-Sorption Degradation -- Bio-Regeneration -
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PlumeStop Bioregenera5on -‐ Laboratory
Contaminant sorbs to sites available on PlumeStop par%cle
Microbes biodegrade sorbed
contaminants
Sorp%on sites become available for addi%onal contaminant
Principle:
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• Microcosm study (8 oz.; 230 ml) – Test: water, lactate, soil, PlumeStop, inoculum (live) – Control: water, lactate, soil, sodium azide (sterilized) – Set-‐up: Equal volumes, no headspace, 27 reps. each
– Loading: 10 mg/L PCE (net) added every two weeks – Study period: 10 weeks
• Dissolved-‐phase analysis (water only) • Total system analysis (water and soil combined)
PlumeStop Bioregenera5on -‐ Laboratory
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PlumeStop treatment: capture of spiked PCE – aqueous-phase protected
Control system: PCE concentrations in water climb with each injection
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PlumeStop bio-‐regenerated
capacity
sorp%on onto soil Sorp%on onto soil plus PlumeStop
Theoretical aqueous-phase concentration without sorption
Theoretical aqueous-phase concentration soil + PlumeStop
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PlumeStop treatment: Total PCE mass drops back to baseline between each spike –
Control system: Total PCE mass climbs with each injection
Sorption + degradation ∴ consistent with bio-regeneration
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PlumeStop Bioregenera5on -‐ Results
• PCE rapidly captured by PlumeStop – Same day capture – aqueous phase (groundwater) cleaned up
• Complete PCE degrada%on post-‐sorp%on – PlumeStop treatment: PCE declines to zero between each spike (whole system)
• Aqueous phase protec%on exceeds sorp%on capacity – Evidence of sorp%on-‐site bio-‐regenera%on
• Func%onal longevity extended (indefinitely) – Significant opportuni%es for migra5ng plume capture – back-‐diffusion management
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Q: Does biodegradation proceed post-sorption? A: Yes it does. Q: Is net contaminant degradation rate enhanced, inhibited or unaffected by
sorption into the biomatrix?
PlumeStop™: post-sorption biodegradation
Benzene Degradation Batch-Equilibrium Study• Soil-water slurry microcosms
– Treatment 1: with PlumeStop (live)– Treatment 2: with PlumeStop (sterile)– Treatment 3: no PlumeStop (sterile)– Treatment 4: no PlumeStop (live)
• Sampled destructively in triplicate– Days 1, 7, 14, 21, 28
• Water concentration monitored by head-space analysis• Total benzene mass monitored by whole-system extraction
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PlumeStop™: post-sorption biodegradation
Rapid sorption in both PlumeStop treatments <1 day Ongoing drop in live PlumeStop and live soil control ∴ likely to be bio But could it be a sorption artifact?
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PlumeStop™: post-sorption biodegradation
Total system extract – soil and water No net loss in either sterile system, with or without PlumeStop Both non-sterile systems show benzene reduction Degradation significantly faster in the PlumeStop system
Howard et al (1991) “Handbook of Environmental Degrada:on Rates.” Lewis Publishers Inc. ISBN 0-‐87371-‐358-‐3
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What if this (linear) rate could continue at this lower concentration….?
So this is the general idea – although the top end is accelerated too
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–performance –
chlorinated solvents – post-sorption degradation – lines of evidence
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Background• Groundwater bioremediation progress
– Typically monitored in the dissolved phase
– Lines of evidence approach – multiple parameters
• PlumeStop™ - sorption precedes degradation– Contaminant and daughter products drop to below detection limits
– What verification lines of evidence for degradation remain open?
• Case study example – Geochemical and microbial diagnostic lines of evidence
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California Site
• Pilot test – single well• Former dry cleaners• Modest µg/L PCE residue
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California Site• ‘Dune Sand’ formation
• 10 m/year groundwater flow
• High redox conditions (aerobic)
• No attenuation evident
• PCE 550 µg/L
• No daughter products
• PlumeStop™
• Electron donor and bacteria
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Pilot Test Arrangement
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Historic Data
Steadily increasing PCE
No daughter products
(aerobic conditions)
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(<0.5µg/L)
>99.9% reduc5on
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Redox ‘sweet spot’ establishes Competing TEA’s decline
(note zero on 2o axis)
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PCE immediately ⬇︎ to ND (<5µg/L) Micro parameters increase post-app then decrease after ~two months
225%
541%676%
(init. ND)3,000 x
(no methanogenesis)
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< MQL (5 µg/L; 0.5µg/L) through 7 consecu%ve sampling rounds – 451 days (15 months) and coun%ng…
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Data Summary• >99% (two OOM) PCE concentration reduction within 14 days
– 550 µg/L to non-detect (<5 µg/L)
• Optimal dehalorespiration conditions established– Redox from +254 mV to -150 mV (±30 mV) ‘sweet spot’
– Competing electron acceptors depleted
• Post-inoculation microbial trends– Increase then decrease in dechlorination species and enzymes
– Consistent with solvent metabolism and depletion
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Specifics• DHC enzyme activity – provides strong indicator of degradation
– Increase in tceA reductase and vinyl chloride reductase post-application
– TCE and VC remain below detection limits in groundwater (<5µg/L)
• Dechlorination species proliferate post-application– Dehalococcoides spp., Dehalobacter spp., Dehalogenimonas spp. ⬆︎⬆– Reasonable to assume they are growing on H2(aq) and solvent
• Geochemical status favourable for dehalorespiration– but not favourable for competing methanogenesis
– therefore optimal for bioremediation performance and efficiency
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Conclusions
• PlumeStop™ - depletion of GW solvents to n/d within 19 days
• Lines of evidence for post-sorption degradation secured
• All data obtainable from groundwater samples alone
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- commercial projects -
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Case Study- Manufactured Gas Plant / PAHs -
Richmond IN
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PlumeStop™ MGP
• Silty clay loam transi%oning to sand and gravel
• Globules of oil-‐like material in pore space
• Injec%on 4.0 – 6.7 mbgl • PlumeStop™ • ORC-‐Advanced®
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Average dissolved-phase reduction 95% (to reporting limit)
Post-treatment concentrations all below RISC residential and/or 0.5 µg/L
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Case Study- Migrating Plume – Barrier Application -
North Carolina
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PlumeStop™ -‐ Migra5on Cut-‐off Barrier
• Former Industrial Dry Cleaner • PCE residues • Pilot Barrier • Mul%ple targeted forma%ons • 2.75 – 12.5 mbgl
• Silty Sand (ca. 1.4 to 5.3x10-‐4 cm/sec)
• Seepage Velocity ca. 22 m/year
• HRC® BDI® PlumeStop™
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99.7% reduc%on 94.2% reduc%on
[DEGRADATION TREND EXAMPLE]
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Case Study- Deep Plume Treatment -
West Allis, WI
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PlumeStop™ -‐ Deep Plume Treatment
• Former Dry Cleaner • PCE residues • Vadose soil mixing • RegenOx® ISCO • Deep plume treatment • 24 – 27 mbgl
• HRC®, BDI®, PlumeStop™
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98.6% reduc%on 99.7% reduc%on 99.8% reduc%on
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Case Study- Filling Station – BTEX Residues -
Pennsylvania
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PlumeStop™ -‐ Filling Sta5on
• Former Filling Sta%on • BTEX residues • Pilot Applica%on • Tight forma5on • 2.75 – 4.5 mbgl
• Clay with Sand (ca. 3.53x10-‐7 cm/sec)
• Seepage Velocity Zero • ORC-‐Advanced®, PlumeStop™
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<0.5 µg/L >98.3% reduc%on
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Case Study- Inner-City Development / Time Pressure -
Downtown Chicago
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• Neighborhood of McCormick Place – Central Chicago – New Sports Stadium – New Hotel Complex
• Solvent residues • Tight 5me window • High cost implica5ons of delay • Key remedia5on requirement: FAST
Case Study: Inner City Development – Time Pressure
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Case Study: Inner City Development – Time Pressure
• Why the 5ght 5me window? – Weren’t the solvent residues known?
• Access restric5ons – historic buildings – Precluded early start
• Problem was moved aside
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Case Study: Inner City Development – Time Pressure • PCE and TCE residues – up to 7,440 µg/L • Sand forma%on over clay
– Treatment area 300 m x 500 m – (1,000’ x 1,600’) – Treatment Zone 3 – 7 mbgl -‐ (10’ – 22’)
• Enhanced bio: HRC®, BDI® – Sufficient to address the contamina%on
• PlumeStop™ – Rapid risk reduc%on and bio process accelera%on – Take the bio process out of the groundwater phase
• 19 days’ fieldwork on site (Chicago winter) – 138 direct-‐push injec%ons – no resident equipment
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96.9% reduc%on Total VOC
96.5% reduc%on Total VOC 92.3% ∑ VOC MCL 567 µg/L
TCE MCL 242 µg/L (site works / access restric%ons – no groundwater data)
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96.9% reduc%on Total VOC
96.5% reduc%on Total VOC
Compositional changes consistent with biodegradation
92.3% ∑ VOC MCL 567 µg/L
TCE MCL 242 µg/L (site works / access restric%ons – no groundwater data)
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83% reduc%on Total VOC
84% reduc%on Total VOC
Compositional changes consistent with biodegradation
79%
TCE MCL 242 µg/L
∑ VOC MCL 567 µg/L
(site works / access restric%ons – no groundwater data)
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Chicago Site -‐ Status • Rapid reduc%on in groundwater contamina%on
– 80 – 97% from first sampling interval (total solvents)
• Bio condi%ons established (redox, TOC, microbial numbers) – Parent/daughter compound ra%o shivs (dissolved phase) – (consistent with biodegrada%on)
• ∑VOC targets met – from first sampling round (through all rounds) • TCE targets met – from second sampling round (and degrading fast) • Comple%on report submiwed (June 2015) • No further ac%on required
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Case Study- Rail Terminal – Solvent Residues -
Bologna, Italy
•
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Two components
• Laboratory tests – basic principles – Dispersion – Contaminant capture
• Field Pilot – real-‐world prac%cality – Method of applica%on – Placement valida%on
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Laboratory Test Program – University of Rome Sapienza
• Dispersion of PlumeStop through columns – Sand column – Sand and clay column
• Contaminant capture by residual coa%ng – Sand column – Sand and clay column
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Laboratory Test Program – Dispersion
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Sand Column Clay and Sand Column
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Laboratory Test Program – Capture
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Laboratory Test Program – Capture
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PlumeStop™ -‐ Bologna Rail Sta5on • Major rail sta%on upgrade • Solvent residues (ca. 100 µg/L) • Pilot Applica%on
• Complex alluvial forma5on – Fine Sand + Silt (ca. 7.5 x10-‐4 cm/sec)
• 6.0 – 8.0 mbgl • 5.0 m/year seepage velocity
– Fine to Med Sand (ca. 7.5x10-‐3 cm/sec) • 17 -‐ 19 mbgl • 50 m/year seepage velocity
• HRC®, PlumeStop™ • Field applica5on tests
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PlumeStop™ -‐ Bologna Rail Sta5on – Field Applica5on
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PlumeStop™ -‐ Bologna Rail Sta5on – Field Applica5on
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PlumeStop™ -‐ Bologna Rail Sta5on – Placement Valida5on
Entry into monitoring wells: - Weak evidence of placement
Confirmatory soil coring: - Strong evidence of placement
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PlumeStop™ -‐ Bologna Rail Sta5on – Placement Valida5on
• Fine Sand + Silt (ca. 7.5 x10-‐4 cm/sec) • 6.0 – 8.0 mbgl • 5.0 m/year seepage velocity
post-‐applica%on pre-‐applica%on Visual indications of evenly dispersed dark material No visible fracture or ‘soil parting’ placement
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PlumeStop™ -‐ Bologna Rail Sta5on – Placement Valida5on
Visual indications of evenly dispersed dark material No visible fracture or ‘soil parting’ placement
• Fine Sand + Silt (ca. 7.5 x10-‐4 cm/sec) • 8.0 – 9.0 mbgl • ca. 5.0 m/year seepage velocity
post-‐applica%on pre-‐applica%on
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PlumeStop™ -‐ Bologna Rail Sta5on – Placement Valida5on
Visual indications of evenly dispersed dark material No visible fracture or ‘soil parting’ placement
• Sand and gravel layer • 9.0 – 10.5 mbgl
post-‐applica%on pre-‐applica%on
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PlumeStop™ -‐ Bologna Rail Sta5on – Placement Valida5on
post-‐applica%on pre-‐applica%on
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PlumeStop™ -‐ Bologna Rail Sta5on – Placement Valida5on
post-‐applica%on pre-‐applica%on
“Effective foc” – activated carbon sorption >> organic carbon sorption Plots show factor of 50 – 100 x The factor estimated for TCE is significantly higher
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PlumeStop™ -‐ Bologna Rail Sta5on – Sorp5ve Efficacy
post-‐applica%on pre-‐applica%on
• Soil from cores tested for contaminant capture in lab
• Batch-‐equilibrium study • 20 g water; 5.0 g core soil • Triplicate samples
• PCE: 2,800 µg/L • TCE: 7,100 µg/L ca. 100 x site concentrations
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PlumeStop™ -‐ Bologna Rail Sta5on – Retained Sorp5ve Efficacy
-‐ preliminary data -‐ PCE: 100% capture in all samples (2,800 µg/L)
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Bologna Centrale: Status
• Field Pilot – real-‐world prac%cality – Method of applica%on ☑︎ – Placement valida%on ☑︎
• First field sampling data imminent – (not quite in %me for webinar)
• Full scale applica5on approved – Scheduled for January 2016
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Europe Status
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Europe Status
• Eight further projects scheduled in next 4 – 5 months – United Kingdom – Belgium – Italy
• 30 further projects in design phase • Wide interest everywhere
– Ireland to Poland – Scandinavia to Mediterranean
• Wide regulatory acceptance
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- usage indicators -
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1. When time is critical
2. To secure stringent clean-up targets
3. For passive control of migrating contamination
4. As a long–term means of addressing matrix back-diffusion
PlumeStop™ – product usage indicators
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PlumeStop™ – product usage indicators
1. When time is critical
The fastest groundwater remediation technology available today?
• Immediate risk reduction secured through sorption(especially fast due to high relative surface area and wide dispersion)
• Long-term destruction secured through in-matrix biodegradation(accelerated degradation achieving bio-regeneration of sorption sites)
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PlumeStop™ – product usage indicators
2. For securing stringent clean-up targets
• Low µg/L targets are challenging for all technologies
• Bio typically performs comparatively well, but at very low concentrations, substrate availability becomes insufficient to support microbial activity
• PlumeStop accumulates low-level contaminants into the bio-matrix until concentrations become sufficient within the matrix to support an active microflora while keeping contaminants out of the groundwater
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PlumeStop™ – product usage indicators
3. Passive control of migrating diffuse contamination
Used in barrier formation to capture diffuse contaminants
• Concentration of contaminants in matrix for locally intensive treatment
• Tighter capture zone than bio-barriers alone(especially valuable where space is limited and/or groundwater is fast-flowing)
• Faster destruction rates and greater timing tolerance between (bio) amendment applications – if still needed
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PlumeStop™ – product usage indicators
4. A long–term means of addressing matrix back-diffusion (i.e. diffusion-driven rebound)
• PlumeStop maintains a concentration gradient out of the immobile porosity
• Mobile porosity contaminant conc. remains low due to capture by PlumeStop
• Sorption sites regenerate due to accelerated in-matrix biodegradation
• The product is not consumed and remains functional – theoretically for decades
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Contaminant diffuses out of
immobile porosity
Biodegrada%on accelerated within the matrix
Mobile-‐porosity concentra%ons
decline / remain low
Sorp%on sites are regenerated
GW contaminants par%%on into the
PlumeStop
Back-‐diffusion gradient
created / sustained
Bacteria and substrate are concentrated
together
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- close -
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PlumeStop – positioning within Regenesis product range
• Used to further increase bioremediation performance
• Reduced treatment times• Achieve very low target concentrations (low µg/L range)
• Can be co-applied with electron donor/acceptor technologies• Aerobic bioremediation – e.g. with ORC-Advanced®
• Anaerobic bioremediation – e.g. with HRC®
• Used as a standalone treatment • Where natural donor/acceptor supply is adequate • E.g. migrating plume management – back-diffusion management
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PlumeStop – further information
• www.regenesis.com – case studies, tech bulletins, and
• white Paper – technology detail & supporting science
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Tech Bulle5ns – available online: click here
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up-front orders of magnitude reduction and accelerated bio-destruction using a dispersive injectable reagent
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www.regenesis.com
Jeremy Birns+ngl Ph.D. B.Sc. MSEE, CEnv
Vice President
Environmental Technology
+44 1225 731 446
Bath, UK
Thank You