Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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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.
Suppose a brine contalning 0.2 kg of salt per liter runs into a tank initially filled with 500 L of water containing
5 kg of salt. The brine enters the tank at a rate of 5 L/min. The mixture, kept uniform by stirring, is flowing out
at the rate of 5 L/min. Find the concentration, in kilograms per liter, of salt in the tank after 10 min.
Chapter 6 Solutions
Solid Waste Engineering
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