Incorporating Waste Prevention Activities Into Life Cycle Assessments of Residential Solid Waste Management Systems
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Incorporating Waste Prevention Activities into Life Cycle Assessments of Residential Solid Waste Management Systems By Julian Cleary A thesis submitted in conformity with the requirements for the degree of Doctor of Philosophy, Graduate Department of Geography, University of Toronto © Julian Cleary 2012 ii Incorporating waste prevention activities into life cycle assessments of residential solid waste management systems Doctor of Philosophy, 2012 Julian Cleary Graduate Department of Geography University of Toronto Abstract The four papers of this dissertation explore themes related to waste prevention, the system boundaries, functional units and scale of life cycle assessments (LCAs) of municipal solid waste (MSW) management, as well as the transparency and consistency of the application of LCA methods. The first paper is a comparative analysis of the methodological choices and transparency of 20 LCAs of MSW that were recently published in peer-reviewed journals, and includes a comparison of their midpoint level impact values using statistical indicators. The second paper proposes a conceptual model, designated WasteMAP (Waste Management And Prevention), for evaluating LCAs of MSW which incorporate waste prevention. In WasteMAP, waste prevention through dematerialization is viewed as analogous to waste treatments so long as it does not affect the functional output (product services) of MSW-generating product systems. Papers 3 and 4 comprise the WasteMAP LCA case study. Paper 3 depicts product LCAs of wine and spirit packaging (conventional, lightweight and refillable, each type generating different quantities of waste) at the scale of the individual package and the municipality. At the municipal scale, the LCAs address impacts from the wine and spirit packaging supplied in the City of Toronto, Canada in 2008, and a waste prevention scenario which substitutes lighter weight and reusable containers. The lowest endpoint level impacts out of the five container types studied were associated with refillable containers and aseptic cartons. Paper 4 addresses the Toronto MSW management system and applies the WasteMAP model to allow for the comparison, on a functionally equivalent basis, of the LCA results of a reference scenario, based on 2008 data, with a scenario incorporating six types of waste prevention activities (prevention of unaddressed advertising mail, disposable plastic bags, newspapers, lightweight and refillable wine and spirit packaging, iii and yard waste). The findings highlight the benefits of waste prevention, and the relative significance of the decision to account for recycled content when modelling waste prevention. The endpoint level impact assessment results using the ReCiPe and Impact 2002+ evaluation methods are in keeping with the assumption in the waste hierarchy that waste prevention has a superior environmental performance. iv Acknowledgements I wish to thank a number of people for helping me with the design and completion of my research. I greatly appreciate the encouragement, insightful suggestions and help of Virginia Maclaren, my supervisor, as well as my committee members: Miriam Diamond, Danny Harvey and Rodney White. I am also grateful for the enthusiasm and interest of my colleagues and friends at the Geography Department in my research. I am grateful to the City of Toronto Solid Waste Management Services (John Baldry, Bonnie Ballam, Anne Wheatley, Irene Zeppieri), the Liquor Control Board of Ontario (Ian Loadman, and special thanks to Tod Stewart), as well as numerous wineries and distilleries and equipment manufacturers, for participating in my study. I am also appreciative of Dr. Sarah Finklestein’s kind offer of the use of her lab for some of my mass measurements. The Recycling Council of Ontario (RCO) provided me with countless opportunities to meet and discuss waste management issues with many people involved in this fascinating field. I wish to thank Usman Valiante of Corporate Policy Group for his valuable suggestions and for introducing me to the RCO. I would like to extend my thanks and appreciation to the Social Science and Humanities (SSHRC) of Canada and for their financial support in the form of a Canada Graduate Scholarship. I would also like to acknowledge the Geography Graduate Expansion Fund for providing funding for my research. Above all, I would like to express my profound gratitude to my parents for their encouragement, support and insightful contributions that were essential for the successful completion of this dissertation, as well as to Nancy Lo for her forbearance and support. v Acronyms AC Aseptic Carton APS Alternate Product System CSU Conventional Single Use DPFU Downstream Primary Functional Unit IC&I Institutional, Industrial and Commercial ISO International Organization for Standardization LCA Life Cycle Assessment LCBO Liquor Control Board of Ontario LSU Lightweight Single Use MSW Municipal Solid Waste PET Polyethylene Terephthalate RFG Refillable Glass SFU Secondary Functional Unit TPS Targeted Product System vi UPFU Upstream Primary Functional Unit WasteMAP Waste Management and Prevention WPA Waste Prevention Activity vii TABLE OF CONTENTS Abstract ii Acknowledgements iv Acronyms v INTRODUCTION 1 Introduction 2 1.1 Research objectives 4 1.2 Paper descriptions 5 1.2.1 Life cycle assessments of municipal solid waste management systems: A comparative analysis of selected peer-reviewed literature (Paper 1) 5 1.2.2 The incorporation of waste prevention activities into life cycle assessments of municipal solid waste management systems: Methodological issues (Paper 2) 6 1.2.3 Life cycle assessments of wine and spirit packaging at the product and the municipal scale: A Toronto, Canada case study (Paper 3) 7 1.2.4 Waste prevention and life cycle assessment of residential waste management in Toronto, Canada (Paper 4) 7 1.3 References 8 PAPER 1 Life cycle assessments of municipal solid waste management systems: A comparative analysis of selected peer-reviewed literature 2.1 Introduction 11 2.2 Research objectives 12 2.3 Methodology 13 2.3.1 Selection criteria for LCAs of MSW 13 2.3.2 A common basis for the analysis 14 2.4 Results 14 2.4.1 Study area and scale 14 2.4.2 Goals of the reviewed LCAs 16 2.4.2.1 Comparisons of MSW management systems 16 2.4.3 Functional units 17 2.4.4 System boundaries 18 2.4.4.1 The ‘cradle’ and ‘grave’ of waste 19 2.4.4.2 Life cycle environmental emissions from the production of 20 capital / infrastructure 2.4.4.3 Environmental emissions from MSW transportation 20 2.4.4.4 Selection of energy sources 21 2.4.5 Environmental impacts and LCIA 22 2.4.5.1 Impact categories 23 2.4.5.2 Characterization of impacts 23 2.4.5.3 Single score weighted valuations of impacts 24 viii 2.4.6 Types and sources of data 26 2.4.7 Sensitivity analysis 27 2.4.8 Economic costs of MSW treatment 28 2.5 Comparison of results 29 2.5.1 Acidification potential 32 2.5.2 Global warming potential 33 2.5.3 Net energy use 34 2.6 Discussion 36 2.7 Conclusion 37 2.8 References 38 PAPER 2 The incorporation of waste prevention activities into life cycle assessments of municipal solid waste management systems: Methodological issues 3.1 Introduction 43 3.2 Research objectives 46 3.3 Types of waste prevention activities 46 3.4 Attributional and consequential approaches to waste prevention and LCA 48 3.4.1 The attributional approach 49 3.4.1.1 The traditional product LCA 49 3.4.1.2 The traditional LCA of MSW 50 3.4.2 The consequential LCA 51 3.5 The WasteMAP life cycle assessment 51 3.5.1 System boundary 52 3.5.2 Functional units 54 3.5.2.1 Primary functional unit 55 3.5.2.2 Secondary functional unit 56 3.5.3 Waste flows 57 3.5.4 Environmental emissions 59 3.6 Discussion 61 3.7 Conclusion 63 3.8 References 63 PAPER 3 Life cycle assessments of wine and spirit packaging at the product and the municipal scale: A Toronto, Canada case study 4.1 Introduction 68 4.2 Research objectives and methodology 70 4.2.1 Functional units 71 4.2.2 Packaging scenarios 72 4.2.2.1 LCA scenarios for wine and spirit packaging at the scale of 72 an individual package 4.2.2.2 LCA scenarios for wine/spirit packaging consumption at 72 the municipal scale ix 4.2.3 System boundary 76 4.2.4 Data sources 78 4.2.4.1 Life cycle assessment software, databases and impact 78 assessment tools 4.2.4.2 Questionnaire to wine and spirit producers 79 4.2.4.3 Field and laboratory research 80 4.3 LCA input profile 81 4.4 LCA unit processes 84 4.4.1 Aseptic carton production 84 4.4.2 Glass bottle production 85 4.4.3 Polyethylene terephthalate bottle production 86 4.4.4 Production of secondary packaging 86 4.4.5 Transportation of materials 86 4.4.3.1 Transportation of containers from manufacturer to packager 87 4.4.3.2 Transportation of containers from packager to Toronto 88 4.4.6 Rinsing and filling of containers 90 4.4.7 Reuse of containers 90 4.4.7.1 Transportation of used bottles between retailer and 91 cleaning/refilling facility 4.4.7.2 Washing of used glass bottles 91 4.4.8 Waste management 91 4.4.8.1 Waste collection, transportation and sorting 92 4.4.8.2 Recycling 93 4.4.8.3 Landfilling 94 4.5 Life cycle impact assessment results 94 4.5.1 Individual package scenarios 95 4.5.2 Municipal scale scenarios 99 4.5.2.1 Climate change 99 4.5.2.2 Endpoint level impacts 100 4.6 Sensitivity analysis 105 4.7 Critical review 107 4.8 Discussion 111 4.9 Conclusion 112 4.10 References 113 PAPER 4 Waste prevention and life cycle assessment of residential waste management in Toronto, Canada 5.1 Introduction 121 5.2 Research objective 122