Advanced Solid Waste Management

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Properties Of MSW: 

Higher Bulk Density Refuse 

This electronic presentation to be used with Worrell/Vesilind/Ludwig. Solid Waste Engineering: A Global Perspective, SI Edition, 3E. From Worrell/Vesilind/Ludwig. Solid Waste Engineering: A Global Perspective, SI Edition, 3E. © 2017 Cengage Learning, a part of Cengage Learning, Inc. All rights reserved. Reproduced by permission. Text/images may not be modified or reproduced in any way without prior written permission of the publisher. www.cengage.com/permissions LINK: http://columbiasouthern.adobeconnect.com/p5l1jxudxxn/ Problem:

(a) As a consultant, your client gives you literature that it has received from two manufacturers of shredder equipment. The bulk density specification of Unit “A” is 35.7 lb./ft3 and the bulk density of Unit “B” is 450 kg/m3. Which unit will deliver a higher bulk density refuse? Show your work.

(b) Referring to the diagram below, how far above the floor is the bulk density of the stored municipal solid waste (MSW) compressed to 250 kg/m3?

Solution: (a)

Step 1: We will convert the 35.7 lb./ft3 to the same units as Unit B—kg/m3. This requires knowing the conversion factors for lbs. to kg, as well as ft3 to m3. Using a conversion table, we find the following information:

1 lb. = 0.454 kg and 1 ft3 = 0.0283 m3

Step 2: Set up the calculation by beginning with the units you have

35.7 .

.

.

. . Unit A’s bulk density

Therefore, Unit A has the better performance.

(b) 250 kg/m3 occurs at 2.5 meters, which is approximately 8.2 ft.

Using a conversion table, we know that 1 meter = 3.28 ft (approximately). Therefore:

2.5 .

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