1 / 21

Impact of Biodiesel in Ozone Production in Atlanta

Impact of Biodiesel in Ozone Production in Atlanta. Siv Balachandran EAS 6410 4/24/07. Outline. Motivation Biodiesel Ozone Pollution Formation Overview of OZIPR Model Assumptions Model Results Conclusions. Motivation. Ozone is a primary pollutant under NAAQS

rolf
Download Presentation

Impact of Biodiesel in Ozone Production in Atlanta

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Impact of Biodiesel in Ozone Production in Atlanta Siv Balachandran EAS 6410 4/24/07

  2. Outline • Motivation • Biodiesel • Ozone Pollution Formation • Overview of OZIPR Model • Assumptions • Model Results • Conclusions

  3. Motivation • Ozone is a primary pollutant under NAAQS • 8 hour standard: 0.08 ppm • 1 hour standard: 0.12 ppm • Only for certain areas • Altanta falls under this • Effects of ozone • Health (respiratory) • Damage to vegitation

  4. Ozone Trends in Atlanta http://www.grta.org/news_section/2005_Publications/2004_AQ_report_final.pdf

  5. Non-attainment Areas in Atlanta http://www.grta.org/news_section/2005_Publications/2004_AQ_report_final.pdf

  6. Recent Interest in Biofuels • Driven by several factors • Diesel emissions • Local self reliance • New markets for agricultural crops • Alternative Fuel Laws

  7. Biodiesel • Biodiesel = Tranesterifciation (Vegetable Oil) • Often catalyzed by acid or base • Byproducts • Glycerin, alcohol, catalyst en.wikipedia.org/wiki/Biodiesel, www.biodiesel.org

  8. Biodiesel Yields The Global Petroleum Club via en.wikipedia.org/wiki/Biodiesel

  9. Biodiesel Emission Impacts EPA Draft Technical Report: A Comprehensive Analysis of Biodiesel Impacts on Exhaust Emissions

  10. Ozone Pollution Formation • R1-R3: OH production • R4-R7: O3 production • R8-R9: sinks ftp://ftp.as.harvard.edu/pub/trop/publications/jacobbook/bookchap12.pdf

  11. Ozone Pollution Formation ftp://ftp.as.harvard.edu/pub/trop/publications/jacobbook/bookchap12.pdf

  12. OZIPR Model • 1-D photochemical box model • Trajectory model • Well mixed column of air from ground to mixed layer • Column moves with wind trajectory but cannot expand horizontally • 48 runs • 3 different meteorological conditions per season • Rural, Urban, Carbonyl, No Carbonyl http://www.epa.gov/scram001/dispersion_alt.htm#ozipr

  13. OZIPR Meteorological Conditions

  14. OZIPR Assumptions • Most basic level of OZIPR was used for this study • 8AM - 8PM analysis • Atlanta Summer Met. Condition 2 Urban with Carbonyl Emissions (ATLSU2UC) • OZIPR - unusually high default emissions • Emissions reduction percentages applied equally to each of the hourly emissions

  15. Emissions Assumptions • Only HDDV analyzed • Emission impacts from fuels • NREL study • Eastern USA • Net Reduction = (HDDV% of Mobile Emissions) x (Mobile% of Total Emissions) x (Emissions Reductions) • ULSD only reduced NOx emissions http://www.nrel.gov/vehiclesandfuels/npbf/pdfs/33793.pdf

  16. Model Results

  17. Model Results

  18. Discussion • B20, B100 and ULSD scenarios had little impact on O3 levels • Max 1 hour concentrations (ATLSU2UC): • No Biodiesel: 189.4 ppb • B20: 189.4 ppb • B100: 189.4 ppb • ULSD: 187.8 ppb • 50% NOx reduction: 174.2 ppb • 50% NOx reduction leads to 8.03% decrease in O3 • ULSD scenario - 0.08% decrease in O3

  19. Discussion • Max 1 hour concentrations (ATLSU1UC): • No Biodiesel: 152 ppb • B20: 152.1 ppb • B100: 152.3 ppb • ULSD: 149.5 ppb • 50% NOx reduction: 137.1 ppb • 50% NOx reduction leads to 9.80% decrease in O3 • ULSD scenario - 1.65% decrease in O3

  20. Discussion • Max 1 hour concentrations (ATLSU3UC): • No Biodiesel: 121.7 ppb • B20: 121.6 ppb • B100: 122 ppb • ULSD: 118.3 ppb • 50% NOx reduction: 101.7 ppb • 50% NOx reduction leads to 16.4% decrease in O3 • ULSD scenario - 2.79% decrease in O3

  21. Conclusions • Biodiesel use in HDDV doesn’t help in O3 reductions, but it doesn’t appear to hurt it • Other benefits • ULSD has more impact on O3 than B20 or B100 • NOx reduction is very important for O3 production Atlanta • Food vs. fuel

More Related