THERMAL IN SITU SUSTAINABLE REMEDIATION (TISR) Linking Renewable Energy to Sustainable Site Restoration

Transcription

1 THERMAL IN SITU SUSTAINABLE REMEDIATION (TISR) Linking Renewable Energy to Sustainable Site Restoration May 2016 Davinder Randhawa

2 Low-T Thermal Remediation Fast-evolving Hot water recirculation Aquifer geothermal energy processes Low-T electrical resistive heating (ERH) Forced hot air based biodegradation Mesophilic (20 C 40 C) or Thermophilic (40 C 80 C) 10 C to 20 C increase caused 3 times faster BTEX degradation (Margesin 2001) Biodegradation Rate mg/kg/day Dettmer C C >30 C Low-T thermal remediation evolved naturally at the heels of the High-T thermal, and has been driven by sustainability champs; incentivized by corporate financial pressures. 31 May

3 Thermal/Chemical Hydrolysis expertise Thermal/Chemical Hydrolysis-based degradation of 1,1,1 TCA using hot water re-circulation and exsitu treatment of GW. Temperature- Activated Autodecomposition Reactions - TAADRs Suthersan et al (2012)

4 Geothermal Remediation Expertise Arcadis has successfully remediated multiple legacy sites. Sanergy system which uses heat-cold storage associated with commercial/residential geothermal heating and cooling to enhance bioremediation. (2013) Slenders et al (2010)

5 Thermal In Situ Sustainable Remediation (TISR)

6 TISR s unique niche? SANERGY TAADR Low-T ERH In situ Remediation-focus with conventional energy input Ex-situ Solar reflection/desorption Solar desalination/waste water evaporation/zld Ex-situ Solar Collection applications

7 Preliminary Thermal Modeling (2014) 6 Months 12 Months C 8 m 33 C 45 C

8 Pilot Test Site Upstate NY Petroleum hydrocarbon dominated plume spreads 10 acres; 10 ppm dissolved BTEX Pilot test area Fine to medium sand geology Depth to groundwater ~15-17 feet bgl TISR is being tested as an alternative to an imminent $500K AS/SVE system expansion 31 May

9 Initial Pilot Test Target 250 ft 2 area Location of wells View looking back along the trench line One BHE surrounded by observation points set at 1, 3, 5, 10 feet from the BHE. Five vertical Thermocouples per TC location Off the shelf equipment GW flow Feet

10 TC-1 1 foot from BHE Target zone (16-22 bgl); best Δ T response Min. response at 13, 25 bgl Mechanical Hurdles BHE May

11 TC-2 3 feet from BHE Target zone (16-22 bgl); best Δ T response Min. response at 13, 25 bgl BHE May

12 TC-3 5 feet from BHE Some Δ T response Negligible response recently (April-May) 13 may be responding to spring GW recharge BHE May

13 BTEX and HPC trends Δ T Avg 5 Max T 20 Δ T Avg 5 Max T 20 Δ T Avg 2 Max T 16 Δ T Avg 2 Max T 16 DTW bls GW flow 31 May

14 Model Refinement (2016) 8 m 35 C

15 Mid-point temperature of 8m BHE array (model) 5 C Δ T at 3 feet from BHE has been confirmed with the one BHE pilot. Multiple BHE array needed in the field setting to fully replicate model results on a larger scale. Mesophilic (20 C 40 C) seems to be the target TISR sweetspot C 30+ C 31 May

16 Scaled-up Costs for a m 2 area 3 Solar Collectors and equipment; $20,000 enhanced sensors and PV power Installation labor $15,000 Driller (6 BHE, 3 TCs) $20,000 Design $2,000 Total capital cost $57,000 O&M (annual) $3,000 per year ~8 m Comparison with traditional remediation system Fraction of lifecycle costs Five times reduction in carbon footprint GW flow BHE TC ~8 m

17 Summary TISR is a feasible, practical, sustainable solution and has immediate applicability to environmental restoration Standalone OR in-tandem application (ERD/bio, Physical extraction systems, Biowalls/reactive barriers etc.) BTEX and HPC trends may need further data collection/validation BHE array 8m apart seem to be an ok design criteria 31 May

18 Potential Data Gaps and Future Refinements Enhanced/precise and monthly microbial population analysis Well head gas monitoring for CO 2 GW Conc. trends, biogeochemistry monitoring (metals, sulfate, methane) Additional BHE array install at the current site; add short term energy storage Horizontal Heat Exchangers in tandem to an existing AS/SVE system (separate site)

19 Your Presenter DAVINDER RANDHAWA Environmental Engineer o c e davinder.randhawa@arcadis.com Team: Cullen Flanders, Philip Visser, Derek Rosso, Andy Vitolins, Stefan Bagnato, Meghan Kiser, Terry Laparr. 31 May

20 Stop by booth 217 for more information! 31 May