Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Chapter 3, Problem 3.20P
To determine
The number of commercial location that can be serviced in one day.
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O Solid waste from a park is to be collected in large containers. It is estimated that the average time to
drive from the garbage to the first container t, and from the last container t₂ to the garbage each day
will be 15 and 20 minutes, respectively. If the average time required to drive between the containers
is 360 seconds and the two-way distance to the disposal site is 50 km (speed limit 88 km/hr), determine
the number of containers that can be emptied per day, based on an 8-hour work day.
Note: at 88 km/hr speed, a = 0.016, b=0.011; S = 0.133, W=0.15; Pc+U= 0.4 h/trip.
Calculate the number of stops in each trip of 1.50 h of refuse collection for the following data
v= velocity = 15 km/h – 4.17 m/s
d= distance= 750 m
n = number of containers to empty per stop=1
tc= time to empty one bin/container= 650 s
Estimate the number of dump trucks requireu
transportation of 1125 cum of materials per day for average
lead of 5 km with the following data;
Capacity of one dump-truck = 15 cum
Speed during empty haul @ 25 km/hr and loaded haul @ 20
km/hr
Loading time for one dump truck = 10 minutes.
Take 10% in stand by and 6 hours working period in a day.
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- The first decision to be made is how the solid waste container will get from the residence to the collection vehicle. Compare the advantages and disadvantages of the two methods of collection truck routing. i. Daily route method ii. Single load methodarrow_forwardAssume two truckloads, 4.02 hours of actual collection per day, the truck be if it has a compaction ratio of 3.5:1, and pickup vehicle averages 5 mph between stops that are on the average separated by 150 feet. Each stop collects from two households that each put out two full 30-gallon (4.4 cubic feet) containers. It takes an average of 20 seconds to empty one container. What is the time required to serve each stop in seconds?arrow_forwardAssume it cost an average of $0.03/ton.min to haul waste from collection to transfer station and then from the transfer station to landfill using a transfer vehicle and the operation cost of the transfer station is $2/ton. The cost of hauling waste directly from the collection point to landfill is $0.1/ton.min. The speed limit of any type of vehicle carrying waste between the collection point, the transfer station, and the landfill is 40 miles/hr. At/above what distance (miles) is using a transfer station more economical? Round your answer to the nearest whole number. Show your work.arrow_forward
- (84 Solid waste from a park is to be collected in large containers. It is estimated that the average time to drive from the garbage to the first container t, and from the last container t₂ to the garbage each day will be 15 and 20 minutes, respectively. If the average time required to drive between the containers is 360 seconds and the two-way distance to the disposal site is 50 km (speed limit 88 km/hr), determine the number of containers that can be emptied per day, based on an 8-hour work day. Note: at 88 km/hr speed, a = 0.016, b= 0.011; S = 0.133, W = 0.15; Pc+U= 0.4 h/trip.arrow_forward3.37 A company produces four products in its production facility. The facility has four de- partments labeled A-D. The routing information, production quantities, and volumes for each product are given in the table below. Product 1 2 3 4 Production Quantities (per day) 15 20 14 10 Routing B-A-D-C-A A-D-C-B A-C-D-B B-A-C-D Volume (compared to Product 1) 1 1 2 0.5 Determine the from-to chart. Recommend a flow pattern.arrow_forward(a) Explain and sketches the types of incidents for the activities of loading and unloadingarrow_forward
- Example 7-2 Selection of container size for use at a commercial facility A commercial facility produced the following quantities of solid waste each week for a calendar quarter of operation. Using these waste production data, determine the size of container at which it becomes more cost effective to make extra pickup trips, on call instead of using a larger-sized container. Assume the data given below are applicable. 1. Waste production data Week no. 1 2 3 4 5 6 7 2. Collection system data Capacity yd3 30 35 40 45 50 - - Waste yd3/wk 41 30 35 34 39 25 32 - Week no. 8 9 10 11 12 13 Capital cost $ Annual O&M cost &/yr 3000 150 175 225 Waste yd3/wk 27 37 36 33 28 31 3500 4000 4900 6100 Cost per trip= 50$.00/trip Useful life of the containers= 10 yr Discount rate=10% Capital recovery factor= (i=10%, n=10yr) = 0.16275 300 400arrow_forwardA mass haul diagram developed for a section of a road construction project is shown below. 1000 800 600 400 200 200 400 600 800 1000 -200 -400 -600 -800 -1000 Distance along centerline (m) For this roadway section, determine the following values: i. The total cut volume m3 ii. The total fill volume m3 iii. The total waste volume m3 iv. The total borrow volume m3 Cumulative volume (BCM)arrow_forwardPlease answer the problem below using Nscp 2015,thank you,Asaparrow_forward
- Example 8-2 Determination of haul-speed constants. The following average speeds were obtained for various round-trip distances to a disposal site. Find the haul-speed constants a and b and the round-trip haul time for a site that is located 11.0 mi away. Round-trip distance (x), mi/trip Average haul speed (y), mi/h Total time (h =x/y), h 17 0.12 0.18 0.25 28 8. 32 12 36 0.33 16 40 0.40 20 42 0.48 25 45 0.56arrow_forwardBecause of a difference of opinion among city staff members, you have been retained as an outside consultant to evaluate the collection operation of the city of Davis Ville. The basic question centers around the amount of time spent on off-route activities by the collectors. The collectors say that they spend less than 15 percent of each 8-h workday on off-route activities; management claims that the amount of time spent is more than 15 percent. You are given the following information that has been verified by both the collectors and management: (a) A hauled container system, without container exchange, is used. occur. (b) The average time spent driving from yard to the first container is 20 min, and no off-route activities. (c) The average pickup time per container is 6 min. (d) The average time to drive between containers is 6 min. (e) The average time required to empty the container at the disposal site is 6 min. (f) The average round-trip distance to the disposal site is 10…arrow_forwardWhich is a “reasonable” estimate for the volume of a typical office wastebasket? a. 2.5 x 10-2 m3 b. 2.5 x 100 m3 c. 2.5 x 10-4 m3 d. 2.5 x 102 m3 Also give an explanation for the answer, please.arrow_forward
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ISBN:9781305635203
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