4-IE-28-Jan-08

4-IE-28-Jan-08 - Industrial Ecology – Winter 2008 –...

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Unformatted text preview: Industrial Ecology – Winter 2008 – Session 4 – January 28 Goal and scope definition Inventory Inventory analysis analysis Impact assessment Interpretation Life Cycle Assessment Industrial Ecology – Winter 2008 – Session 4 – January 28 Review: Functional unit and reference flows Example: We want to compare the environmental impacts of single-use and reusable diapers Q: What is a suitable functional unit? Q: What are the resulting reference flows? Q: What is a flow diagram? Industrial Ecology – Winter 2008 – Session 4 – January 28 Pulp and paper Absorbent gel LDPE film PP fabric Absorbent gel Raw cotton Cotton fabric Disposable diaper Reusable diaper Diaper use Diaper use Diaper laundry Diaper landfill Diaper landfill Review: Flow diagrams for reusable and single-use diapers Q: What are the boxes? Q: What are arrows? Industrial Ecology – Winter 2008 – Session 4 – January 28 Unit Process Materials Energy Intermediate flows Materials Energy Intermediate flows Emissions to air Emissions to water Emissions to soil INPUTS INPUTS OUTPUTS OUTPUTS Biotic resources Abiotic resources Elementary flows Elementary flows Information contained in a process inventory Information contained in a process inventory Industrial Ecology – Winter 2008 – Session 4 – January 28 Main challenges of inventory analysis Main challenges of inventory analysis Even though the methodology of inventory analysis seems relatively Even though the methodology of inventory analysis seems relatively straightforward, it is – in fact – complicated by two important issues: straightforward, it is – in fact – complicated by two important issues: • Defining Defining boundaries for the system boundaries for the system under analysis: under analysis: Which processes to include and which to exclude (cut-off problem in LCA) Which processes to include and which to exclude (cut-off problem in LCA) • Allocation of elementary flows Allocation of elementary flows if process has more than one economic output: if process has more than one economic output: Which output gets which burdens (Allocation problem in LCA) Which output gets which burdens (Allocation problem in LCA) unit process materials energy wastes emissions product A product B Industrial Ecology – Winter 2008 – Session 4 – January 28 Allocation Allocation (Consoli et al, 1993) identify 3 types of processes where allocation is necessary: co-production , waste treatment , recycling and reuse in an open loop ....
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This note was uploaded on 08/06/2008 for the course ESM 282 taught by Professor Geyer during the Spring '08 term at UCSB.

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4-IE-28-Jan-08 - Industrial Ecology – Winter 2008 –...

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