Problem 1 An advice on the size of the solid waste collection truck is to be provided. The compactor trucks available from a local supplier are rated to achieve a density (DT) of 400 kg/m³ (compacted with maximum truck size of 4 m³) with initial cost of $100,000 and interest rate of 10.25 %. The truck is estimated to have an average operating and maintenance cost of $5.50/km over the five-year life of the truck. The unloading time is 10.0 minutes. The average route length is 7 km while the disposal site is 9.6 km away from the collection route. The average haul speed is 5-30 km/h. From experience, a delay time of 15 minutes can be expected per the trip. The uncompacted density of the solid waste is 100 kg/m³. Each stop typically contains a total 12 kgs of waste. Assume: The time for each pickup (tp) is 0.025 hrs. Two trips per day will be made to the disposal site. • The crew will include two operators with an average hourly wage rate of $15.00 per hour. • The overhead rate is 125 % of the hourly wage rate. Five working days per week with 9 working hours per day Two 15-minute breaks per day are taken by the truck operator. Determine: 1. The solid waste that can be carried by the truck (VT) in m³ 2. The number of stops that can be handled by the truck (NP) 3. Average truck cost ($/Mg) 4. Average Labour cost ($/Mg) 5. The total annual cost is (Truck + Labour costs) 6. Annual cost per service stop ($) 7. Weekly cost per service stop ($)
Problem 1 An advice on the size of the solid waste collection truck is to be provided. The compactor trucks available from a local supplier are rated to achieve a density (DT) of 400 kg/m³ (compacted with maximum truck size of 4 m³) with initial cost of $100,000 and interest rate of 10.25 %. The truck is estimated to have an average operating and maintenance cost of $5.50/km over the five-year life of the truck. The unloading time is 10.0 minutes. The average route length is 7 km while the disposal site is 9.6 km away from the collection route. The average haul speed is 5-30 km/h. From experience, a delay time of 15 minutes can be expected per the trip. The uncompacted density of the solid waste is 100 kg/m³. Each stop typically contains a total 12 kgs of waste. Assume: The time for each pickup (tp) is 0.025 hrs. Two trips per day will be made to the disposal site. • The crew will include two operators with an average hourly wage rate of $15.00 per hour. • The overhead rate is 125 % of the hourly wage rate. Five working days per week with 9 working hours per day Two 15-minute breaks per day are taken by the truck operator. Determine: 1. The solid waste that can be carried by the truck (VT) in m³ 2. The number of stops that can be handled by the truck (NP) 3. Average truck cost ($/Mg) 4. Average Labour cost ($/Mg) 5. The total annual cost is (Truck + Labour costs) 6. Annual cost per service stop ($) 7. Weekly cost per service stop ($)
Solid Waste Engineering
3rd Edition
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Worrell, William A.
Chapter3: Collection
Section: Chapter Questions
Problem 3.1P
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Transcribed Image Text:Problem 1
An advice on the size of the solid waste collection truck is to be provided. The compactor trucks available
from a local supplier are rated to achieve a density (DT) of 400 kg/m³ (compacted with maximum truck size
of 4 m³) with initial cost of $100,000 and interest rate of 10.25 %. The truck is estimated to have an
average operating and maintenance cost of $5.50/km over the five-year life of the truck.
The unloading time is 10.0 minutes. The average route length is 7 km while the disposal site is 9.6 km away
from the collection route. The average haul speed is 5-30 km/h. From experience, a delay time of 15
minutes can be expected per the trip. The uncompacted density of the solid waste is 100 kg/m³. Each stop
typically contains a total 12 kgs of waste.
Assume:
The time for each pickup (tp) is 0.025 hrs.
Two trips per day will be made to the disposal site.
• The crew will include two operators with an average hourly wage rate of $15.00 per hour.
• The overhead rate is 125 % of the hourly wage rate.
Five working days per week with 9 working hours per day
Two 15-minute breaks per day are taken by the truck operator.
Determine:
1. The solid waste that can be carried by the truck (VT) in m³
2. The number of stops that can be handled by the truck (NP)
3. Average truck cost ($/Mg)
4. Average Labour cost ($/Mg)
5. The total annual cost is (Truck + Labour costs)
6. Annual cost per service stop ($)
7. Weekly cost per service stop ($)
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