Presentation on theme: "Chapter 11: Environmental Impact Lecture 1: The Environmental Impact of Bio-based Composites."— Presentation transcript:
Chapter 11: Environmental Impact Lecture 1: The Environmental Impact of Bio-based Composites
Learning Objectives Identify some environmental impacts of bio- based materials Discuss some trends in resource availability Understand the potential advantages of composite materials
Bio-based Materials have Several Potential Advantages Renewable Abundant Carbon neutral Low processing energy Biodegradable Cost effective Domestic supply Sustainable?
Increasing Wood Use - USA Data from: J Howard Research Paper FPL–RP–637 Growing population uses more resources Wood use per person per day? – Equal to a ‘2 by 4’ about 5 feet long – About 3 times the global average
Wood Use Over Time - USA Source: J Howard Research Paper FPL–RP–637 Per person usage of wood has been decreasing – Increased efficiency – Substitution Increasing population means more wood use overall
Wood Use in USA USA is world’s largest consumer AND producer of wood products
Global Condition of Forests Deforestation is serious problem worldwide About 0.18% loss per year globally Variable – US and European forests are increasing. Rate of deforestation is decreasing
US Forest Inventory - US Forest inventory is increasing – Even as cutting (‘removals’) increases
Increasing Efficiency Data from: J Howard Research Paper FPL–RP–637 – Very little waste – Wood use efficiency has been steadily increasing in US
Composites Increase Efficiency Data from: J Howard Research Paper FPL–RP–637 – Raw material efficiency Waste wood/fiber Higher utilization Off species
Other Advantages of Composites – Engineered – Randomize defects – Avoids size restrictions Can make big things from small pieces – Reduced anisotropy The Tacoma Dome is framed with wood composites
Wood/Bio-based Products Can Reduce Greenhouse Gasses Storing carbon in forest, building products, and landfills Using biomass (processing residues) for energy Substituting for (fossil) energy-intensive products such as concrete and steel
Green Building with Bio-based Composites – Green building programs are developing E.g. LEED, Green Globes Can reward the use of greener materials US energy use by sector, Buildings are responsible for a lot of energy consumption.
Review Compare the environmental impact of bamboo and engineered wood flooring Do bio-based materials add to or reduce CO2 levels in the atmosphere (greenhouse effect)? Are bio-based materials sustainable?