vertex environmental inc. - canadian brownfields network · vertex environmental inc. june 15, 2017...
TRANSCRIPT
Vertex Environmental Inc.
June 15, 2017
Bruce Tunnicliffe
Novel Adsorptive Methodfor Chlorinated Solvent Remediation
• Adsorptive Material– Activated Carbon– What is it?– How Is It Applied in the Subsurface?
• Case Studies– Dry Cleaner & the Sewer Line– Commercial London Site– Industrial Mississauga Site
• Questions
Outline
• Inexpensive Remediation
• Certainty of Remediation
• Long Term Remediation Solutions
• Sustainable Remediation
What Do Brownfield Developers Want?
Activated Carbon
Starting Materials
• Bituminous Coal• Coconut Shell• Lignite• Peat• Wood• Bone Char
Activated Carbon
5
Activated Carbon
Activated Carbon – Trapping Contamination
7
• Relative adsorption strength increases with molecule complexity– Multi-cyclic > Mono-cyclic > Aliphatic– Double bond > Single Bond– Chlorinated > Non-Chlorinated
Benzene(ppm)
Capacity(mg/g)
10 40
1 1
Ethylbenzene(ppm)
Capacity(mg/g)
10 325
1 53
C6H6 C8H10
• Mechanisms:• Trap the contamination within the GAC matrix
• Treat within the matrix
• BOS-100®
• For Chlorinated Solvents
• GAC & impregnated Iron
• BOS-200®
• For Petroleum Hydrocarbons
• PAC & Nutrients & Blend of Microorganisms
Adsorptive Carbon – Trap and Treat
Delivery
Hose from Pump
Injection TipInjectate
Bentonite Seal
Deepest Point of Injection
Injections using top-down approachSource: AST Environmental
Adsorptive Carbon – Trap and Treat
Case Studies
Case Study #1cVOCs Along Sewer Line
Case Study – Sewer Line
Case Study – Sewer Line
(ug/L)MW-DeepMax Conc
MW-ShallowMax Conc
PCE 4,680 3,410
TCE 4 5
DCE <0.50 <0.50
VC <0.20 <0.20
Total 4,680 3,415
VOC Groundwater Analytical
Case Study – Sewer Line
Dry Cleaner
Sewer Line
Case Study – Sewer Line
Case Study – Sewer LineShallow
Sewer Line
Deep
Sewer Line
Case Study – Sewer Line
• Zero Valent Iron (ZVI) Injection– August 2015, 3 days
– Vertical: 1.8 m to 4.6 m (shale)
– 2,400 kg of ZVI, with guar gum
– 7,000 L of slurry
– 8 injection locations
• Activated Carbon Injection– November 2016, 2 half-days
– Vertical: 1.8 m to 4.6 m (shale)
– 100 kg of BOS100
– 1,500 L of slurry
– 6 injection locations
– Careful delivery over specific vertical intervals
• Before Each Injection– Hydro-vac down to top of Sewer– Camera inside sewer at location of injection
Case Study – Sewer Line
Hydro-vac’ing Top of Sewer
Case Study – Sewer Line
Camera in Sewer
Injection using Geoprobe
Case Study – Sewer Line
Case Study – Sewer Line
Case Study – Sewer Line
Case Study – Sewer Line
Case Study – Sewer Line
Case Study – Sewer Line
Case Study – Sewer Line
(ug/L)Avg Conc
Before WorkAvg ConcAfter ZVI
Avg ConcAfter BOS
PCE 2,370 4.5 1.8
TCE 2 4.6 0.7
DCE <0.50 34 2.2
VC <0.20 23 2.0
Total 2,372 66 6.7
% Reduction - 97.2% 99.7%
VOC Groundwater Analytical – MW-Deep
Case Study – Sewer Line
(ug/L)Avg Conc
Before WorkAvg ConcAfter ZVI
Avg ConcAfter BOS
PCE 2,510 101 <0.20
TCE 3 163 <0.20
DCE <0.50 925 2.3
VC <0.20 115 5.3
Total 2,513 1,304 7.6
% Reduction - 45% 99.7%
VOC Groundwater Analytical – MW-Shallow
Conclusions
• ZVI Injection effective at remediating PCE
– Yet at the shallow MW, daughter products remain
• After BOS Injection:
– Lowest VOC gw concentrations recorded at those MWs
Case Study – Sewer Line
Case Study #2cVOCs Results from London Site
Case Study – London Site
Case Study – London Site
Injection: April 2017
Case Study – London Site
Case Study – London Site
Case Study #3cVOCs Results from Mississauga Site
Case Study – Mississauga Site
AEC-1
AEC-2
Questions?
Thank You for Your Time
Bruce Tunnicliffe
Vertex Environmental Inc.
(519) 249-9184 mobile
www.vertexenvironmental.ca