Solid Waste Engineering
3rd Edition
ISBN: 9781305635203
Author: Worrell, William A.
Publisher: Cengage Learning,
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Chapter 2, Problem 2.3P
To determine
The maximum compaction attainable in the landfill.
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10.5. Estimate the thickness of a clay layer that would be required to limit
the flow of leachate from the bottom of a landfill to a value of 1.0
mm/d. Assume the hydraulic conductivity of the clay material is
5 x 10-8 m/s and that the surface of the groundwater is 0.68 m
below the surface of the leachate collected in the bottom of the
landfill.
Daily cells for a landfill are operated so that the following conditions are maintained: thickness of daily cover= 0.2 m; slope (horizontal:vertical)= 3:1, working face for refuse= 30 m; height of refuse= 3 m; and volume of daily refuse= 1,800 m^3/day. The landfill is interested in reducing requirements for daily cover soil over its 20 year life and is considering three options (that is, have a lower Vs/Vr). Which option should be the best? Why? Option 1: Increase height of refuse to 4 m. Option 2: Increase daily refuse volume to 2000 m3/day. Option 3: Decrease working face to 20 m.
A landfill is to be designed to serve a
population of 200000 for a period of 25 years.
The solid waste generation is 2kg/person/day.
The density of the uncompacted SW is 100 kg/
m³ and a compaction ratio of 0.4 is suggested.
The ratio of compacted fill (i.e. SW+Cover) to
compacted SW is 1.5. The landfill volume (in
million m3) req. is
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- Choose the correct answer Which of the following is a correct description about stabilization within landfills? Stabilization is the process in which gas and leachate in solid waste are produced; Stabilization is the process in which inorganics in solid waste is decomposed by microbes; Stabilization is the process in which organics in solid waste is decomposed by microbes; Stabilization is the process in which heavy metals in solid waste is adsorbed. Ratio of TCE’s partial pressure to TCE’s concentration in water is usually constant at equilibrium. However, the ratio may be changed when which of the following is changed? Temperature; B. TCE’s partial pressure; TCE’s concentration in water D. all of the abovearrow_forward(ii) The Kumasi landfill serves a population of 253,000. Each week 325 trucks bring a total of 2180 tonnes of MSW to the landfill. Each truck averages two loads per day. The trucks each has a capacity of 4.5 tonnes, and operate 5 days per week. (a) How much MSW is generated per person? Give your answer in kg.capta-1.day. (1 tonne = 1000kg). (b) What is the average load (in metric tonnes) in each truck when they at the landfill? At what capacity are the trucks operating? (c) If the density of the waste is 265kg.m-3, what is the volume of the MSW disposed of at the landfill each week?arrow_forwardEstimate the life of a landfill for a user population of 10,000. The available area for the are-type landfill is 10 acres. The water table is estimated at 6.1m(20ft) below the ground surface. The pit must have side slope of 1:3 and the final surface must have a slope of 1:4. Assume that soil (used as daily cover) occupies 20% of the compacted volume of wastearrow_forward
- The Kumasi landfill serves a population of 253,000. Each week 325 trucks bring a total of 2180 tonnes of MSW to the landfill. Each truck averages two loads per day. The trucks each a capacity of 4.5 tonnes, and operate 5 days per week. (a) How much MSW is generated per person? Give your answer in kg.capta-1.day. (1 tonne = 1000kg). (b) What is the average load (in metric tonnes) in each truck when they at the landfill? At what capacity are the trucks operating? (c) If the density of the waste is 265kg.m-3, what is the volume of the MSW disposed of at the landfill each week?arrow_forwardA waste with a 5-day BOD (BOD)=200mg/L and k = 0.1 day¹ is discharged to a river at a rate of 1 m/s. The river has flow rate of 9 m/s and a background ultimate BOD (Lo) of 2 mg/L upstream of the discharge. (a) Calculate the ultimate BOD (Le) of the waste. (b) Furthermore, assuming instantaneous mixing after discharge, calculate Lo of the river water after it has received the waste. Ans.: (a) Ultimate BOD of wastewater = 508.3 mg/L, (b) Ultimate BOD of river water after discharge of waste-52.63 mg/L.arrow_forwardEstimate 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 54.5arrow_forward
- 3. A MSW facility is designed to handle solid waste generated by a town at a rate of 75,000 kg/d. The waste is delivered by compactor truck 4 days/week, and 30% of the waste is recycled. The density of the disposed waste before compaction is 120 kg/m3. The waste is compressed to a compaction ratio of 4.0. Daily cover takes up 20% of the total landfill cell volume, and a single lift is 3.5 m high. Engineers have designed the landfill for two lifts, and a total of 6.0 hectares are available for this MSW landfill. Calculate how long (in years) it will take to fill up this landfill as designed.arrow_forwarda landfill contains leachate with a chloride concentration of 2135mg/l. the landfill has a clay liner that is 2m thick and has a tortuosity coefficient of 0.5. the diffusion coefficient for chloride is 2.3×10-⁹. after 50years what would be the chloride concentration just outside of the clay liner? assume theres no ground water gradient across the linerarrow_forwardA sewage sludge is to be transported a distance of 3 mi through a 12in ID pipeline at a rate of 2000 GPM. The sludge behaves as a Bingham Plastic with a yield stress of 35 dyne/cm2, limiting viscosity of 80 cP, and a specific gravity of 1.2. What size motor (hp) is required to drive the pump if it is 60% efficient?arrow_forward
- A leachate collection system is being designed for a 10 acre landfill. If the drainage rate through the waste to be collected in the perforated pipe is 1.5 inches/day, determine the expected leachate from the landfill in ft3 /s.arrow_forwardIf the bicarbonate concentration of a leachate is 1000 mg/L and the pH measured in the field is found to be 5.8, estimate the partial pressure of the carbon dioxide within the landfill.arrow_forwardEstimate 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.arrow_forward
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