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

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

Solid Waste Engineering

3rd Edition

ISBN:9781305635203

Author:Worrell, William A.

Publisher:Worrell, William A.

Chapter2: Municipal Solid Waste Characteristics And Quantities

Section: Chapter Questions

Problem 2.13P

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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
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 = 5
7-5. Assuming that the quantities of solid wastes generated daily at a commercial facility are distributed normally, with a mean value of 10 yd3 and a standard deviation of 7 yd3, what size container would you recommend for this facility? What are the important tradeoffs in the selection of container size?
Example 4 From the following data estimate the unit waste generation rate for a residential area consisting of approximately 1,000 homes. The observation location is a local transfer station, and the observation period is 1 wk. 1. Number of compactor truck kinds = 10 2. Average size of compactor truck = 20 yd³ 3. Number of flatbed loads = 10 4. Average flatbed volume = 1.5 yd³ 5. Number of loads from individual resident private cars and trucks = 20 Estimated volume per domestic vehicle = 8 ft³ (1 yd³= 27 ft³) 6. Solution 1. Set up the computation table (see Table 13 below). 2. Determine the unit waste generation based on the assumption that each household is comprised of 3.5 people. Estimation of unit solid waste generation rates Item No. of Ave. vol. Unit wt. Total wt lb loads 1b/yd3 Compactor truck 10 20 yd³ 350 Flatbed truck 10 1.5yd³ 150 Individual private vehicle 20 0.30 yd³ 100 lb= 0.454 kg Ans: 3.0 lb /capita/day
Font (1) If the BOD5 of a waste is 220.0 mg/L and the ultimate BOD is 320.0 mg/L, what is the rate constant?
A town with 2,350 residents wants to establish a municipality owned and operated solid waste collection program. They can purchase one of three possible trucks that have the ff. characteristics: Truck A, 18 m^3 capacity Truck B, 15 m^3 capacity Truck C, 12 m^3 capacity If the truck is to collect the refuse for one-fifth of the town each day during a 5-day work week, then every residence will be collected during the week, and the truck will have to make only one trip per day to the landfill. Which truck or trucks will have sufficient capacity. Assume a rate of 1.75 kg/capita/d. Assume that the truck is able to compact the refuse to 350 kg/ m^3 What is the total tonnage of solid waste to be collected/wk? What is the total weight of waste to be collected everyday? What is the required truck capacity in cubic meters? Which truck should be bought?
How many residences can be served? If we have a compactor truck which has a capacity of 30 yd3, each truck makes 3 trips/day 5 days a week, each residence has 3 people and each person produces 4lbs of waste. The density of the compacted waste is 425 lbs/yd3.
Estimate the life of a landfill (years) given a population of 250,000 people, 40 acre, a maximum depth of 50 feet below ground, a pit slope of 1:3 and final slope of 1:4. The coversoil occupies 22% of the compacted volume. There is a 42% diversion rate, the waste is compacted to 1,270 lb/yd3, the population is stable and generates 6.2 lb/capita/day. The landfill area is square and the max height of the landfill is 33 yd.
Describe the different types of domestic solid waste.
A yard waste composting windrow has a triangular cross section and is 10 feet wide at the base and 10 feet high at the peak and 100 feet long. You may assume the waste has a specific weight of 400 Ib/yd^3 as placed in the windrow. The waste material is 40-percent biodegradable and has the ultimate composition of C60H95040N. Determine the amount of oxygen required to stabilize the waste (show all work for full credit). Assume the aerobic degradation can be expressed as: (4a + b - 2с + За 02 b - 3d aco, + ("). H20 + dNH3 CaH¿0̟Na + 4 2
Define the term “field capacity of solid waste”.
Estimate the area and volume of landfill to handle the solid waste from Warriorville for20 years. Based on a 10 yd sample of waste collected from an existing landfill during normal off‐loadingoperations. Assume the following:1. Population of 14,5662. Average solid waste generation rate of 2.42 lbs cap‐1 d‐13. Average uncompacted density of 9.03 lbs ft34. cell height of 8 ft 5. recommended depths of cover will be used6. normal compaction7. characterization of Warriorville solid waste based on a based on a 10yd dumpster sample isdescribed belowWaste Composition Mass (lbs)Food waste 56.5Paper and Cardboard 120.8Plastic 10.1Rubber, leather, wood 26.7Textiles 23.1Metals (90% Ferrous) 45.2Glass 30.6Miscellaneous 54.5