ees3040HW10solns_fa10

ees3040HW10solns_fa10 - Fall 2010 EES 3040 Homework 10...

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1 EES 3040 Homework 10 Solutions Reading Assignment: Chapters 12 and 13; handouts and Internet Problem 1. Answer the following review questions, using 3-4 sentences each and include diagrams as required: a.) (1 pt.) Ch 12/13, Review Question 16: Purpose of daily cover: control pests, rodents, and fires. Minimum daily cover depth: 0.15 m (15 cm). See D&M1 509-511 or D&M2 612 b.) (1 pt.) Ch 12/13, Review Question 17: Leachate is the liquid that results from both the decomposition of waste and the liquid that passes through the landfill. Leachate comes from liquid that enters the landfill from precipitation and from the degradation of organic waste in the landfill. See D&M1 pgs. 511-515 or D&M2 pgs. 613-614 c.) (1 pt.) Ch 12/13, Review Question 18: Sketch of MSW landfill. See D&M1 Figures 12- 13 and 12-14 or D&M2 Figures 13-14 and 13-15, class notes, and handout Problem 2. (5 pts.) Text Problem 12-3/13-3. Landfill calculations Given: 562,400 people, 1.89 kg/capita-day of MSW, Volume of landfill = V LF = 11,240,000 m 3 , 63% of landfill used E = (V MSW + V cover )/V MSW = 1.9, Compacted density = ρ c = 490 kg/m 3 , Time left = ? Solution: V MSW = (562,400 people)(1.89 kg/capita-day)(m 3 /490 kg) = 2,169.26 m 3 /d V total = V MSW + V cover = (E)( V MSW ) = (1.9)(2,169.26 m 3 /d) = 4,121.59 m 3 /d Remaining V LF = (1-0.63) (11,240,000 m 3 ) = 4.1588 x 10 6 m 3 (3 pts) Time left = (4.1588 x 10 6 m 3 )/(4,121.59 m 3 /d) = 1009.1 days (1 yr/365 days) = 2.76 years (1 pt) Alternatively, use Equation 12-3 to help solve: V LF = PEC/ ρ c Problem 3. (5 pts.) Landfill calculations Given: 63,000 tons/yr or MSW, 25% recycling, Density of MSW = ρ = 250 lb/yd 3 Compaction ratio = r = 4.1, Lift height = H = 12 ft, 0.82 V LF = V MSW,c a.) Lift area/year = A LF = ? Volume of MSW = V MSW = (1-0.25)(63,000 ton/yr)(2000 lb/ton)(1 yd 3 /250 lb) = 378,000 yd 3 /yr Volume of compacted MSW = V MSW,c = V MSW /r = (378,000 yd 3 /yr)/(4.1) = 92,195.1 yd 3 /yr 0.80 V LF = V MSW,c , so then V LF = V MSW,c / 0.80 V LF = (72,195.1 yd 3 /yr)/(0.80) = 115,243.9 yd 3 /yr (3 ft/1 yd) 3 = 3.11159 x 10 6 ft 3 /yr Area of lift/year = A LF = V LF /H
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ees3040HW10solns_fa10 - Fall 2010 EES 3040 Homework 10...

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