Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Question
Chapter 3, Problem 3.6P
To determine
The plot of percent of properly disposed items versus the number of receptacles and discuss the results.
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From the following date, estimate the unit waste disposal rate per week for a residential
area consisting of 1200 homes. The average occupancy is 4 persons per home. The
observation location is a local transfer station that receives all of the wastes collected for
disposal. The observation period was one week.
Data:
Number of compactor truck loads = 10
Average size of compactor truck = 20 yd³
Number of flatbed loads = 6
Average flatbed volume = 3 yd³
Number of loads from individual residents' private cars and trucks = 20 Estimated
average volume per domestic vehicle = 9 ft³
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
400
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
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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.arrow_forwardFrom the following date, estimate the unit waste disposal rate per week for a residentialarea consisting of 1200 homes. The average occupancy is 4 persons per home. Theobservation location is a local transfer station that receives all of the wastes collected fordisposal. The observation period was one week.Data:Number of compactor truck loads = 10Average size of compactor truck = 20 yd3Number of flatbed loads = 6Average flatbed volume = 3 yd3Number of loads from individual residents’ private cars and trucks = 20 Estimatedaverage volume per domestic vehicle = 9 ft3arrow_forwardQuestion 4 Screenings are placed in a debris roll-off dumpster that holds 20 cubic yards of screening. How long will it take to fill the 20 cubic yard dumpster in days? Known Unknown Flow 8.0 MGD Time to fill dumpster, days Screening removed gal/day-100 gal/day Capacity of dumpster = 20 cubic yards 7.48 gallon in a cubic ft (ft3) 27 cubic ft in a cubic yard (yd3) = O 0.72 days O 100 days O 40.39 daysarrow_forward
- The City of Forty-Five (population 465,565) has requested your assistance in evaluating its solid waste collection system. Determine the mean time per collection stop plus the mean time to reach the next stop, the number of pickup locations per load, and the minimum number of trucks the city must own. The City of Forty-Five collection data are as follows: Average truck capacity = 12.5 m3; Average observed compaction ratio = 2.87 Crew size = 2; Number of pickups = 1 /wk (no rear-of-house service) Average number of cans per stop = 2.63/wk at 0.1136 m3/can Average number of residents per stop = 5 Average uncompacted density = 105.76 kg/m3 Average transport time to disposal site including delays and dumping = 1.78 h/trip Average number of trips to disposal site = 2/d; Rest breaks = 2 at 28.0 min Average maintenance downtime = 37.0 min/d; Average workday = 8.00 h Average percent of trucks out of service for major repairs = 15.0% Number of workday per week = 5arrow_forwardThe town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if its 5076 households discard waste with weights having a mean that exceeds 26.49 lb/wk. For many different weeks, it is found that the samples of 5076 households have weights that are normally distributed with a mean of 26.22 lb and a standard deviation of 12.65 lb.What is the proportion of weeks in which the waste disposal facility is overloaded?P(M > 26.49) = Enter your answer as a number accurate to 4 decimal places. NOTE: Answers obtained using exact z-scores or z-scores rounded to 3 decimal places are accepted.Is this an acceptable level, or should action be taken to correct a problem of an overloaded system? No, this is not an acceptable level because it is not unusual for the system to be overloaded. Yes, this is an acceptable level because it is unusual for the system to be overloaded.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_forward
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