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UNIVERSITY OF CALIFORNIA RIVERSIDE Physical and Chemical Characterization of Particulate and Gas Phase Emissions From Biomass Burning A Dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Mechanical Engineering by Seyedehsan Hosseini December 2012 Dissertation Committee: Dr. Heejung Jung, Chairperson Dr. David Cocker Dr. Marko Princevac Dr. David Weise Copyright by Seyedehsan Hosseini 2012 The Dissertation of Seyedehsan Hosseini is approved: _______________________________________________ _______________________________________________ _______________________________________________ _______________________________________________ Committee Chairperson University of California, Riverside Acknowledgements Although only my name is on the cover of this dissertation, I could have never finished this thesis and explored the hidden angles of my research without help of many people. My deepest gratitude is to my advisors Dr. Heejung Jung, Dr. David Cocker, and Dr. Wayne Miller for giving me the freedom to explore on my own and guidance to correct my mistakes, teaching me to have confidence to manage projects, question thoughts and express ideas. Their recommendations and instructions have enabled me to assemble and finish the dissertation effectively; I cannot thank them enough. Next, I would like to thank Dr. David Weise and Dr. Marko Princevac for being a part of my final thesis committee. Dr. Weise gave me tremendous insight into the statistical analysis of data. Dr. Princevac accompanied me during a few of my major field experiments without his help, I could have faced major problem. My special thanks go to William A. Welch for sharing his field experience with me, providing me hands-on training, and being with me in every single field test that I had. I will always be grateful to Kathy Cocker, Kurt Bumiller, and Charles Bufalino for accepting me as a member of CECERT family and their help with the test-preparation of laboratory and field experiments. I would also like to thank graduate and undergraduate students (Maryam Hajbabaei, Varalakshmi Jayaram, Poornima Dixit, Li Qi, Ping Tang, Xiaochen Tang, Ajay Chowdry, Harshit Agrawal, M Yusuf Khan, Nicholas Gysel, Daniel Short, Michael Giordano, Shunsuke Nakao, James Gutierrez, and Charles Wardle) for their technical and analytical support. iv A special thanks to the U.S. Department of Defense Strategic Environmental Research and Development Program (SERDP) for providing the financial support without which none of this research could have happened. Finally, I would like to thank my family and friends here and back home for their moral and emotional support I needed to complete my dissertation. Thanks Mom, Dad, Elham, Mehrnoosh, Mehran, and Maryam… The text of Chapter 3 of this dissertation, in part or in full, is a reprint of the material as it appears in the Journal of Atmospheric Chemistry and Physics, Volume 10, August 2010, doi:10.5194/acp-10-8065-2010 v Dedication I dedicate this work to my parents Masoomeh Irandoost and Jalil Hosseini for their endless love, encouragement, and support all through my life. You taught me perseverance, strength and commitment… vi ABSTRACT OF THE DISSERTATION Physical and Chemical Characterization of Particulate and Gas Phase Emissions From Biomass Burning by Seyedehsan Hosseini Doctor of Philosophy, Graduate Program in Mechanical Engineering University of California, Riverside, December 2012 Dr. Heejung Jung, Chairperson Biomass burning is a dynamic combustion process during which large concentrations of particles and trace gases are released into the atmosphere. Trace gases emitted by fires include significant amounts of carbon monoxide, nitrogen oxides, volatile organic compounds, and long-lived greenhouse gases such as carbon dioxide and methane. This work surveys 18 different vegetation types of southeast (SE) and southwest (SW) U.S. commonly present in prescribed burns. The work provides key factors for prediction of Particulate Matter (PM) and gas phase emissions, and serves as a basis for atmospheric models used for land management. It was found that EC/TC ratio is the best surrogate for prediction of hydrocarbon emissions, performing better than the commonly used Modified Combustion Efficiency (MCE). The emissions factors were observed to decrease exponentially with elemental carbon to total carbon ratio (EC/TC ratio) used as an indirect measure of fire intensity. No regional/vegetation type dependency was observed for hydrocarbon emissions; the emissions tend to change with MCE and fire intensity. PM emission factors were found to correlate with EC/TC ratio or MCE. Metals, anion, and cation emissions were affected most directly by fuel composition. vii Table of Contents Chapter One: Introduction ................................................................................................................. 1 1.1. References ................................................................................................................................. 7 Chapter Two: Effect of low-density polyethylene on smoke emissions from debris pile burning ................................................................................................................................................. 17 2.1. Abstract .................................................................................................................................... 17 2.2. Introduction ............................................................................................................................ 18 2.3. Experimental Techniques and Procedure ........................................................................... 20 2.3.1. Experimental design and fuel description ................................................................... 20 2.3.2. Sampling Media and Instrumentation.......................................................................... 22 2.3.3. Off-line Analytical Methods .......................................................................................... 23 2.4. Results and discussion ........................................................................................................... 25 2.4.1. Fire and Smoke Characteristics..................................................................................... 25 2.4.2. Fuel Composition Analysis ........................................................................................... 25 2.4.3. Emission Factors ............................................................................................................ 26 2.5. Summary and Conclusions .................................................................................................... 33 2.6. Acknowledgements ................................................................................................................ 34 2.7. References ............................................................................................................................... 35 viii Chapter Three: Particle Size Distributions from Laboratory-Scale Biomass Fires Using Fast Response Instruments ....................................................................................................................... 61 3.1. Abstract .................................................................................................................................... 61 3.2. Introduction ............................................................................................................................ 62 3.3. Experimental ........................................................................................................................... 65 3.3.1. Combustion Lab Facility ............................................................................................... 65 3.3.2. Particle Measurement System ....................................................................................... 65 3.3.3. Gas Measurement System ............................................................................................. 68 3.3.4. Experimental Fires ......................................................................................................... 69 3.4. Results and Discussion .......................................................................................................... 71 3.4.1. Particle size distribution from 7 to 520 nm measured by FMPS ............................. 71 3.4.2. Particle size distribution from 0.5 to 20 μm measured by APS ............................... 74 3.4.3. Evolution of particle size distribution (FMPS+APS)................................................ 75 3.5. Conclusions ............................................................................................................................. 77 3.6. Acknowledgements ................................................................................................................ 78 3.7. References ............................................................................................................................... 79 Chapter Four: Laboratory characterization of PM emissions from combustion of wildland biomass fuels ..................................................................................................................................... 105 4.1. Abstract .................................................................................................................................. 105 4.2. Introduction .........................................................................................................................