EShomework4 - Kate Schref October 28, 2008 Envr Sci 203:...

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Kate Schref October 28, 2008 Envr Sci 203: Homework #4-Due Friday, 31 st 1. A car is a combination of many subassemblies, components, and materials, some of which exhibit Type I behavior, some of which exhibit Type II behavior and some of which (potentially) exhibit Type III behavior. a) Identify 5 major components and 5 major materials and determine whether their behavior is Type I, Type II or Type III. A Type I material is linear. After such material has entered a system, it will inevitably be disposed of as waste. Such materials can be known as complete waste, or as residuals, which can be reused within the system as a whole. Type II materials can be downcycled in the future. This internal reuse of materials allows for some parts of a material to be reused to some extent, but often in a different form (internal material loop). Type III materials can be fully recycled. These are types of materials we see in nature (ex: a dead fish is “used” but then can serve as perfect food for another living organism). Component Material Type Tires Rubber Type II (50% to make more tires(III), floor mats, etc; 50% to be burned for energy) Fuel/Liquids Gasoline/washer Type I (immediately disposed of as waste) fluid Frame of car Steel Type II (shredded and recovered for downcycling) Windows Glass Type I (usually landfilled) Interior Plastic, leather Type I (usually landfilled) b) Identify ways in which increased cyclization of each selected component and material can be achieved. Do not limit yourself to technological solutions: in some cases, for example, the key to increased cyclization may be economic or political. Component How to increase cyclization Tires Not burning tires for energy. If we continue to research and develop ways to produce energy without burning materials like rubber, we would be able to actually recycle the rubber and make more tires! Fuel/Liquids This answer is pretty clear. By shifting to alternative fuel methods, such as electric or fuel-cell hybrids, we would decrease consumption of gasoline which would then decrease our waste or virgin materials (and create a sustainable solution). This most likely will require a modification on a national and political level. An unprecedented jump in crude oil price would also motivate this shift from an economical perspective. Also, fluid recovery can be improved by establishing standardized drainage plugs and access ports. This may be a political issue as well. Frame of car Minimize the diversity of the steel used. Bolts and screws so that it is easier to disassemble and preserve the majority of the steel. Also, avoiding painting or plating can improve a car’s chance to be fully recycled. Windows Design so that when removed from a car, they can still be reused (or even downcycled) for other cars or random products as well. Interior
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EShomework4 - Kate Schref October 28, 2008 Envr Sci 203:...

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