Solid Waste Engineering
Solid Waste Engineering
3rd Edition
ISBN: 9781305888357
Author: Worrell
Publisher: Cengage
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Chapter 6, Problem 6.7P

Suppose a wet mixture of old bread, leaves, and soil is placed in a pile 1 m tall, and a long thermometer is struck in the middle of the pile. Every other day. the pile is aerated by throwing the mixture into a new pile. Draw a graph showing the temperature in the pile during the first two weeks and explain why these temperature changes occurs.

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3. A tank initially contains 210 litres of fresh water. Brine containing 2.6 N/litre of dissolve salt runs into the tank at the rate of 9 litres/min and the mixture kept uniform by stirring runs out of the same rate. How long will it take for the quantity of the salt in the tank to be 190 N? In 12 min, determine the concentration of the salt in the mixture.
9. A tank initially contains 200 litres of fresh water. Brine containing 2.5 N/litre of dissolved salt runs into the tank at the rate of 8 litres/min and the mixture kept uniform by stirring runs out at the same rate. How long will it take for the quantity of salt in the tank to be 180 N? In 10 mins, determine the concentration of the salt in the mixture.
You place a 20 g sample of solid waste in a drying oven overnight and find the mass in the morning (after the moisture has been evaporated) to be 16.2 g. A 1 g (wet) sample is also placed in a 1L water jacket bomb calorimeter and 0.18 g of ash remains in the sample cup after combustion. The temperature in the calorimeter is raised by 2.17 ˚C. Calculate the heat value on a wet weight basis, dry weight basis, and on a moisture and ash-free basis. Convert your values to BTU/lb
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