1) In 2010, the amount of paper recovered for recyclingaveraged 334 pounds for e
ID: 631998 • Letter: 1
Question
1) In 2010, the amount of paper recovered for recyclingaveraged 334 pounds for each person living in the US, according to the American Forest & Paper Association (www.epa.gov). The authors of the article reported that recycled paper can be incinerated with an average energy output of 16.29 MJ/Kg releasing 3.9x10^7 kg/CO2 a year. If the population in 2012 was 313,914,040, how much energy (MJ) can be obtained from incineration and how much CO2 (kg/year) may be released in that year?
2) How much of that energy (MJ) can be actually converted into electric power if the conversion efficiency is 23%?
Explanation / Answer
1) Energy = ( 3.13914 x 10^8) x (334x0.453592) x16.29 = 7.747 x10^ 11 MJ energy
CO2 released = (3.9 x10^ 7)x 7.747 x10^ 11 /16.29 = 1.854 x10^ 18 Kg,
2) Electric power energy = (0.23 x7.747x 10^ 11) = 1.78 x10^ 11 MJ
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