Due 1/26/18 Functional Unit Directions: Consider each of the following comparati
ID: 415370 • Letter: D
Question
Due 1/26/18 Functional Unit Directions: Consider each of the following comparative life cycle assessment studies. For each case, identify the following: a) The primary function of the products or process b) The most representative set of functional units. Provide the rationale for your selection by stating why you have selected this set of units and/or why you did not select the other Comparative life cycle assessment cases: 1. Tertiary wastewater treatment by advanced nutrient removal processes in a wastewater treatment plant versus in a constructed treatment wetland. a. Impacts per unit area occupied by the treatment system b. Impacts per unit volume of wastewater treated 2. Reusable cloth versus disposable diapers a. Impacts per unit mass diaper b. Impacts per diaper c. Impacts per diaper per use 3. Bioethanol produced from corn versus switch grass Impacts per gallon bioethanol produced b. a. Impacts per mile driven in a standard vehicle fucled by either fuel 4. Fragrant candle A versus B 5. Locally grown tomatoes versus imported tomatoes 6. Shopping on Amazon versus shopping in store a. Impacts per unit candle volume b. Impacts per hour burn time a. Impacts per tomato b. Impacts per unit mass tomato Impacts per item purchased Impacts per unit volume products purchased a. b.Explanation / Answer
1)
>> The primary process is the waste water treatment.
>> The most representative functional unit would be impacts per unit volume of waste water treated. Waste water is the point of concern here and impacts should be measured with respect to it.
2)
>> The primary function is the usage of diapers
>> Ans is C. Impacts per diaper per use. Usage of diapers is the factor here
3)
>> The primary process is production of bioethanol
>> Ans is A. Impacts per gallon bio ethanol produced. Here decision has to be taken on production process for bioethanol.
4)
>> The primary function is chosing a fragrant candle
>> Ans is b. Impacts per hour burn time. Burn time is the measure used for candle.
5)
>> The primary function is to choose between two grades of tomatoes
>> Ans is b. Impacts per unit mass tomato. Tomatoes are purchased weight basis not on number of units basis.
6)
>> The primary function is to choose between two types of shoppings
>> Ans is a. Impacts per item purchased.
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