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Outdoor Air Scrubbing Back to Basics Fundamental Science Applied to NOA Mitigation

AEG Special Joint Meeting/Symposium “Assessment, Monitoring and Mitigation of Naturally Occurring Asbestos (NOA) Hazards in the Western U.S.”. Outdoor Air Scrubbing Back to Basics Fundamental Science Applied to NOA Mitigation

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Outdoor Air Scrubbing Back to Basics Fundamental Science Applied to NOA Mitigation

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  1. AEG Special Joint Meeting/Symposium “Assessment, Monitoring and Mitigation of Naturally Occurring Asbestos (NOA) Hazards in the Western U.S.” Outdoor Air Scrubbing Back to Basics Fundamental Science Applied to NOA Mitigation James A. Ippolito, Carole J. Kawamoto & Jeffery P. Bauman KUMA Corporation, Grass Valley, California, USA

  2. KUMA’s Strategy for NOA Control • NOA TAMP (Task Analysis & Mitigation Plan) • Identify Particulate Source Areas • Identify Particulate Control Methods • area mist • point source mist • soil glues • adequately wet soil • consolidation of soil • Mitigate all sources

  3. NOA Control using Adequately Wet Testing

  4. Particulate Collection • Inertial Impaction • Collection Efficiency • Dust (NOA) Collection Process • Water Particle Distribution • Comparison of Typical Dust Control Methods to KUMA’s Methods

  5. Particulate Collection Inertial Impaction

  6. Collection Efficiency • General relationship between particle size and collection efficiency • Source: EPA-APTI: 413 Control of Particulate Matter Emissions, 5th Edition, Chapter 4

  7. Dust (NOA) Collection Process 5 micron long asbestos fiber floating in the air Water condensation: NOA fiber too small for effective collisions Nucleated condensation of water molecules and small water particles impaction More condensation: still too small for effective collisions 5 micron size water droplet with NOA fiber nuclei More condensation: still too small for effective collisions 10 micron, cloud-sized droplet Effective collisions and more condensation 100 micron Settling V = 0.3 m/s 200 micron Settling V = 0.7 m/s 1000 micron Settling V = 3.9 m/s

  8. Water Particle Distribution – KUMA Systems

  9. Comparison of Typical Water Spray Methods Fire Hose (velocity >10 mph) 10,000 micron drops 100 psi Spray Fan (velocity >100 mph) ~40 micron drops Water and air at the same velocity Uses 200 psi small volume mist nozzles KUMA Mist Gun (velocity >400 mph) Very small (32% under 40 micron drops) Uses high volume spray nozzle 2,000 psi

  10. KUMAVideo

  11. Question & Answers

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