Waste Collection. Lesson Objectives  Understand problems and concerns associated with MSW collection.  Compare and contrast privately and publicly operated.

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Presentation transcript:

Waste Collection

Lesson Objectives  Understand problems and concerns associated with MSW collection.  Compare and contrast privately and publicly operated systems.  Understand the types of collection systems  Identify the benefits associated with the use of transfer stations  Prepare an economic analysis of transfer stations  Understand the design issues associated with transfer stations

Collection accounts for 70% of a SW budget!

Types of Waste Collection Systems  Refuse Collection Systems (residential)  Commercial Waste Collection  Recyclable Material Collection  179,000 trucks in the US (most diesel powered)

Refuse Collection (Residential)  Stationary container emptied into truck –Manually High injury rates (heavy containers, broken glass/sharp objects) Temporary containers that fall apart –Automatic

Rear Loading Compactor

Side Loader

Automatic Collection  Usually only one driver required  Works best –without on-street parking, low hanging wires, narrow streets –Where commitment to preventative maintenance –Where commitment to educating public –60-90 gal containers

Automated Collection

Residential Collection Unit (RCU) Data Source: O’Brien, J. K. “The Benchmarking of Residential Solid Waste Collection Services, MSW Management, Sept/Oct 2007, pp 12 – 24. Collection Method*RCUs/Crew/On-Route Hour Automated139 Semi-Automated119 Manual136 All Methods134 *Once-per-week curbside waste collection

Maintenance Costs Collection MethodAnnual Maintenance Cost, $ Automated35,000 Semi-automated15,000 Manual8,000 Source: O’Brien, J. K. “The Benchmarking of Residential Solid Waste Collection Services, MSW Management, Sept/Oct 2007, pp 12 – 24.

Commercial Waste Collection  Mechanically front loaded  Hoist trucks  Trash Trailers

Front Loading Compactor

Collection with Recycling  Collection of mixed MSW with sorting at MRF (single stream)  Collection of separated recyclables and MSW(dual stream) –Hand sorting of recyclables at MRF –Hand sorting at point of collection (multi- compartment trucks) –Collection of separate yard waste Bags, bins, or carts (require automation) Vacuum collection Dual compartment collection vehicle  Curbside collection costs are $15/ton lower for single-stream than for separated

Recycling Hauler

Split Body Rear Loader

Vacuum Collection

Collection Options  Public Collection  Private Collection –Non-Exclusive Franchise –Exclusive Franchises

Labor  Labor intensive  Labor unskilled  High turn-over rates  Few prospects for mechanical replacement of manual labor  Injuries and poor working conditions  Limited career opportunities

Customer Service  Frequency of service  Container and storage issues particularly for commercial and industrial  Location of pickup  Special wastes

Management and Financing Issues  Low priority  Resistance to change and new technologies  Lack of quality management  Inflation  Changing with new regulations

Technological Issues  Collection of recyclables, yard waste, special wastes  Yard waste containers - bagged material must be debagged prior to composting  Automated collection  Development of efficient routes  Vehicle weight restrictions  Vehicle turning radius and clearance

Reasons for declining collection frequency include  Proportion of putrescible waste declined (food grinders)  Better design of collection vehicles controls odors and flies  Service costs increased  Time between collection and disposal decreased  Better management  Set out for 1/wk = 97%, 2/wk = 60%

Safety  Third most dangerous job behind fishing and timber cutting –Falls off trucks –Hit by cars –Inappropriate disposal of wastes –Lifting injuries

Fixed Factors Affecting Design and Cost  Fixed Factors  Climate  Topography  Layout - container access (alley, curbside, rear of house)  Available transportation systems, traffic, roads (Venice uses boats)  Types of wastes collected  Population density

Variable Factors Affecting Design and Cost  Storage techniques employed  Recycling  Collection frequency  Crew size  Equipment

Y = a + b + c(d) + e + f + g Where: Y = total collection time/day or week a = garage to route time/day or week b = actual time collecting waste/day or week c = number of trips to disposal site/day or week d = time to drive fully loaded truck to disposal facility, unload and return to collection area/trip e = time to drive to garage at the end of the trip/day or week f + g = off route time, can be expressed as a fraction of Y/day or week Collection Cost Calculations

N = SF/XW Where: N = number of vehicles required S = total number of customers served per week F = collection frequency X = number of customers truck can serve per day W = number of work days per week Collection Cost Calculations - Cont’d

Hauled Container System Disposal Site Number of Containers = n Example below: n=5 The number of drive between containers = n-1 Example: dbc = 4

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