S WOLF. Municipal Solid Waste (MSW) Collection Process Model Overview.
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1 Municipal Solid Waste (MSW) Collection Process Model Overview Megan Jaunich, PE PhD Student Department of Civil, Construction and Environmental Engineering Environmental Research & Education Foundation Lonnie C. Poole Jr./Waste Industries Scholar S WOLF
2 Overview Introduction Model overview Example equations Data development Illustrative results
3 INTRODUCTION
4 Collection process model Estimating cost and energy use Incoming Municipal Solid Waste (Mg in ) User Inputs Waste composition Waste generation Collection schedule and services Collection times and distances Capital, labor, O&M, fuel costs Fuel type and efficiency Garage and office electricity use Waste storage containers, quantity and cost Collection Process Model Direct Emissions (kg/mg in ) Electricity Use (kwh/mg in ) Capital Cost ($/Mg-yr -1 ) Operating Cost ($/Mg in )
5 Process Flow and System Boundary 1 ton MSW for collection Collection Transit Unloading 1 ton MSW delivered to treatment, disposal, or transfer facility Energy Emissions System Boundary Mixed waste or residual waste collection Single stream recycling Dual stream recycling Pre-sorted recycling, drop-off Pre-sorted recycling, crew-sort Leaf vacuum Yard waste/source-separated organics Wet/Dry (co-collected) Yard waste, drop-off Single Stream Material Recovery Facility Dual stream MRF Pre-sorted MRF Mixed waste MRF Thermal waste to energy (WtE) Anaerobic digestion (AD) Composting Transfer station
6 MODEL OVERVIEW
7 Collection Sector, Services, and Destinations Three types of collection sectors: Single-family residential (SF) Multi-family residential (MF) Commercial (COM) User creates any number of collection sectors, and defines the following inputs for each sector: Sector type Population and number of stops (e.g. houses, buildings) Waste generation rate and composition Collection services offered Waste destinations (treatment or disposal facility)
8 Collection process Residual Sample Collection Scheme Single-Family Sector Single Family SS Recyclables Collection service Yard Waste Collection area Commercial Sector Commercial SS MRF Multi-Family Sector Multi Family Compost Residual MW MRF PS Recyclables PS MRF Yard Waste Compost Residual DS Recyclables DS MRF Yard Waste MRF types: SS Single-stream DS Dual-stream PS Pre-sorted
9 Sample Collection Scheme Collection process Single-Family Sector Single Family Collection service Collection area Collection Sector Residual SS Recyclables Yard Waste Collection Services SS MRF Compost Disposal and treatment facilities Multi-Family Sector Residual Multi Family DS Recyclables DS MRF Yard Waste Commercial Sector Collection process Residual MW MRF PS Recyclables PS MRF Commercial Yard Waste Compost MRF types: SS Single-stream DS Dual-stream PS Pre-sorted
10 Collection process Residual Sample Collection Scheme Single-Family Sector Single Family SS Recyclables Collection service Yard Waste Collection area Commercial Sector Commercial SS MRF Multi-Family Sector Multi Family Compost Residual MW MRF PS Recyclables PS MRF Yard Waste Compost Residual DS Recyclables DS MRF Yard Waste The waste stream collected by each collection service can be sent to one or more destinations
11 Sample SWM System Material Reprocessing Comingled Recyclable Collection Commingled MRF Thermal WtE Ash Each collection service can unload at one or more disposal or treatment facilities Mixed Waste/ Residual Collection Organics Collection Mixed Waste MRF Anaerobic Digestion Soil Amendment Mixed waste and recyclables can be sent to transfer station prior to disposal or treatment facility Composting Mixed Waste Recyclables Combustibles Organics Ash
12 Waste sent to landfill or thermal WtE or mixed-waste MRF Process and waste stream description All materials collected (except hazardous or prohibited items). No other collection services offered (e.g., recyclables) All materials collected after recyclables and/or organics have been separated Sector type Single-family (SF) Multi-family (MF) Commercial (COM) SF, MF, COM Collection Service Mixed waste Residual waste Disposal or Treatment Facility Mixed waste MRF Waste to energy
13 Waste sent to single-stream, dual-stream, or pre-sorted MRF Process and waste stream description Sector type Collection Service Disposal or Treatment Facility Commingled recyclables collected from same bin(s) Paper, aluminum, plastic, and un-soiled, dry waste collected in one compartment; wet waste in separate compartment SF, MF, COM SF, MF Single-stream recyclables Dry waste Single-stream MRF Pre-sorted recyclables collected in a single truck with multiple compartments SF, MF, COM Dual-stream recyclables Dual-stream MRF Commingled recyclables sorted at the point of collection SF, MF, COM Pre-sorted recyclables Pre-sorted MRF
14 Waste sent to landfill, AD, thermal WtE, or compost Process and waste stream description Sector type Collection Service Disposal or Treatment Facility Specially-fitted collection vehicle that seasonally vacuums curbside leaves SF, MF, COM Leaf vacuum Yard waste and/or source separated organics (SSO) collected curbside (or dropped off) Food waste, soiled paper, etc. collected in one compartment; dry waste in separate compartment SF, MF, COM (SF) SF, MF Yard waste/ SSO Wet waste Anaerobic digestion Waste to energy Compost facility
15 Collection process Residual Sample Collection Scheme Single-Family Sector Single Family SS Recyclables Collection service Yard Waste Collection area Commercial Sector Commercial SS MRF Multi-Family Sector Multi Family Compost Residual MW MRF PS Recyclables PS MRF Yard Waste Compost Residual DS Recyclables Yard Waste DS MRF For each collection process, the user defines a set of input parameters
16 Sample Collection Input Parameters Description Unit Participation rate % Collection frequency at each stop Times/week Number of working days per week Days/week Distance between garage, collection route, and destination Miles Travel time between garage, collection route, and destination Minutes Distance between collection stops Miles Loading time at one service stop Seconds Time to unload Minutes Break time Minutes Collection vehicle volume yd 3 Waste density by waste stream lbs/yd 3 Utilization factor % Fuel efficiency MPG Vehicle capital and O&M costs $ Labor cost $
17 Collection Model Outputs User reviews default input parameters and changes values as appropriate for each collection scheme (collection sector-process-destination) Model computes four primary outputs: Number of collection vehicles, Nt Cost per waste mass collected, C ($/Mg) Fuel use by collection vehicles per quantity MSW, Fuel (L/Mg) Support facility electricity per quantity MSW, Elec (kwh/mg) Sample calculations
18 EXAMPLE EQUATIONS
19 Number of Trucks Nt = stops F r ( Cd Ht Rd Calculated values: Ht stops per trip Rd trips per day per vehicle stops number of participating collection stops per sector Inputs: Fr Cd collection frequency (1/week) number of working days per week
20 Number of Trucks Nt = stops F r ( Cd Ht Rd Calculated values: stops number of participating collection stops per sector Inputs: Pr stops total stops = Pr stops total participation rate (% stops setting out waste per collection day) total collection stops per sector
21 Number of Trucks Nt = stops F r ( Cd Ht Rd Calculated values: Rd trips per day per vehicle WV F + Tgr + Tfg 0.5 (Trf + S Rd = Tc Inputs: Trf travel time between collection route and facility Tgr travel time from garage to first collection route Tfg travel time from disposal facility to garage Tc time per trip (time to fill truck + Trf + S) F total break time S time to unload at transfer, treatment, or disposal facility WV working hours per day
22 Calculated values: Ht Inputs: gen stop Number of Trucks Nt = stops F r ( Cd Ht Rd stops per trip Ht = waste generation per stop per week (ton/stop-collection) cap total truck capacity (yd 3 ) Ut truck utilization factor (%) den waste density (ton/yd 3 ) 1 gen stop cap Ut den
23 Energy Consumption Fuel used per ton of waste collected Fuel = Fuel D Ref D Ref D is the total mass waste collected per collection vehicle-day Ref D = Ht Rd gen stop where: Ht Rd gen stop houses per trip trips per day/vehicle waste per stop (tons/stop) Fuel D is the total fuel used per vehicle per day
24 Energy Consumption Fuel used per ton of waste collected Fuel = Fuel D Ref D Fuel D is the total fuel used per vehicle-day Fuel D = where: Ref D Drf Dgr Dfg Db Drf MPG Drf + Dgr MPG Drgr + Dfg MPG Dfg + total tons waste collected per collection vehicle-day distance between collection route and facility distance from garage to first collection route distance from disposal facility to garage total distance between collection stops Db MPG Db + T idle gal/hr idle
25 DATA DEVELOPMENT
26 MSW Collection Data Study Data obtained from several municipalities and private waste management organizations transit times time/distance between each collection stop time at each collection stop unloading time at processing/disposal/transfer facility fuel consumption (mpg and gallons/ton waste) Local collection activities observed
27 City Type(s) of Disposal Facility Location and Data Summary Appx. Area mi 2 Population Density cap./mi 2 City A, MRF < Data Provided or Observed Fuel consumption and tonnages; collection route data (distances, times, tonnages) City B, Transfer Station GPS tracking data (distances, times, tonnages) City C N/A < Fuel consumption and tonnages City D N/A Engine control module records for collection vehicles (e.g. fuel efficiency, total distance travelled) City E Private MRF Tip times City E Municipality landfill and transfer station Tip times
28 Time (sec) Collection route time inputs 80 Stop Duration (sec) σ ( 99%) City A Residual City B Residual City A Recycling City B Recycling City A Yard Waste A, Residual Waste B, Residual Waste A, Recycling B, Recycling A, Yard Waste Automated Automated Municipality Automated and Route Automated Semi-Auto/Manual 75 th percentile Median 25 th %ile 2.7σ
29 Time (sec) 80 Collection route time inputs Transit Time(sec) σ ( 99) City A, Residual A Residual Waste City B, Residual B Residual Waste City A, A Recycling City B, B Recycling City A, A Yard Yard Waste Automated Automated Municipality Automated and Route Automated Semi-Auto/Manual 75 th percentile Median 25 th %ile 2.7σ
30 mpg Total average diesel fuel economy A, City RWA B, City RWB C, City RWC D, City RWD A, City Rec A B, City Rec B C, City Rec C Residual Waste Recyclables City (A-C) and Collection Type (Residual Waste or Recyclables)
31 City D: Fraction driving vs. idling Fuel Used Time Driving (>2.8 (>1.8 km/hr) mph) Idling (<2.8 (<1.8 km/hr) mph) 23% 42% 58% 79% Total fuel use: 1,707, ,198 gallons L Total time: 112,564 hours
32 Frequency Frequency Frequency Frequency Material Recovery Facility Tip Durations Tip durations for City E Minutes MRF Tip Durations (Observed) Tip Durations Minutes Transfer Station Tip Durations Minutes Minutes
33 ILLUSTRATIVE RESULTS
34 gallons/ton Sample Results and Model Validation Model-calculated fuel use was compared with operational fuel use value reported by participating municipalities Results demonstrate model functionality; highlight importance of user-defined input parameters City A, RW A B, City RWB A, City Rec A B, City Rec B Residual Waste Recyclables City (A-B) and Collection Type (Residual Waste or Recyclables) Operational, diesel Model-predicted, diesel
35 Environmental Impacts Sample Analysis The collection process model sums life-cycle emissions resulting from collection vehicle fossil fuel use (diesel or CNG) and from garage electricity use A 15% energy penalty assumed for CNG, i.e. fuel economy in miles per diesel gallon equivalent is 15% lower for CNG* Emissions factors developed from EcoInvent 2.2 database were employed along with IPCC year Direct Global Warming Potential (GWP) values *NREL studies report ~10-30% energy reduction per BTU of CNG with respect to diesel
36 GWP per ton waste Environmental Impacts Sample Analysis For the representative municipalities (Cities A and B), fuel type was changed to compare emissions from diesel vs. CNG vehicles based on user-defined emissions profiles Model results can be used to determine lifecycle impacts, such as carbon dioxide equivalent emissions A, City RWA B, City RWB A, City Rec A B, City Rec B Residual Waste Operational, diesel Model-precicted, CNG Recyclables City (A-B) and Collection Type (Residual Waste, Recycling) Model-predicted, diesel
37 Global Warmiing Potential GWP: Illustrative sensitivity to inputs 250 Tons per trip (Mg/trip) Distance (miles) Time at facility (min) Collection time (sec) Time at facility, (min) Metric tons per trip (Mg/trip) Distance route to facility (miles) Time at stop (sec)
38 Discussion Bottom-up collection model can predict cost, fuel consumption, energy use, associated emissions, and selected environmental impacts (e.g., global warming potential) Model-predicted fuel use for representative cities within 5-45% of operational values Different collection scenarios can be created to compare environmental implications of changing inputs
39 Summary A linear process model was developed to compute the total fuel use, electricity use, and cost per Mg waste collected for a defined collection area, and number of trucks required to service each user-defined collection area. Bottom-up analysis allows user to adjust input parameters and enables what if analyses of future collection scenarios, and integrated analyses using SWOLF. Default data set developed from operational data. Collection model results for fuel and electricity use are paired with appropriate emissions coefficients to compute emissions and enable impact assessment.
40 QUESTIONS?
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