The second part of the data base combines technologies into strategies. For example, a strategy could include the collection and transportation of MSW from the curb to a landfill, plus landfilling with gas recovery. Another example would be the collection of reusable materials with processing in a materials recovery facility (MRF), plus the collection, transportation, and landfilling of the remaining MSW.
More complex strategies can also be considered. For example, in a community that prepares refuse-derived fuel (RDF) for direct combustion, the strategy could include collection and transportation of mixed MSW, plus RDF preparation with separation of recyclables, plus landfilling a portion of the MSW that is not used as fuel, plus RDF combustion, plus separate land filling of the ash. The data base combines these technologies in the correct proportions and computes the overall energy requirements and emissions for the strategy as a whole. Table 4.2 lists the terms used in the data base for the strategies for which such calculations have been performed. Figure 4.1 illustrates the common strategies that use only the five major technologies covered in Sections 5 through 8.
Table 4.1 COMMON TECHNOLOGIES IN THE DATA BASE Collection and transportation of MSW in a packer truck Collection and transportation of curbside-separated yard waste in a packer truck Collection and transportation of curbside-separated recyclables in a multi-compartment truck Landfill operations Ash monofill operations Material recovery facility (MRF) operations and remanufacture of the collected materials(a) Mass burning RDF preparation and metal recovery RDF combustion Yard waste composting MSW composting (a) The data base provides only energy data for remanufacture of collected materials. Table 4.2 COMMON STRATEGIES IN THE DATA BASE 1 Landfill with gas recovery 2 Mass burn plus ash landfill 3 Onsite MRF plus mass burn plus ash landfill 4 RDF for direct firing plus landfill 5 Yard waste composting plus landfill 6 Curbside MRF plus landfill 7 Curbside MRF plus mass burn plus ash landfill 8 Curbside MRF plus RDF for direct firing plus landfill 9 Curbside MRF plus RDF for composting plus landfill 10 Curbside MRF plus landfill plus yard waste composting 11 Curbside MRF plus mass burn plus yard waste composting plus ash landfill
Click here for table in WK1 format.
STRATEGIES BASED ON THE FIVE MAJOR OPTIONS
Click here to expand figure.
STRATEGIES BASED ON THE FIVE MAJOR OPTIONS (Concluded)
Click here to expand figure.
The data base contains separate worksheets that characterize either a specific technology or a combination of technologies. The technologies are characterized in terms of "Inputs" and "Outputs."
The common inputs include:
The data base is primarily designed to provide consistent data on individual technologies and to integrate those technologies into strategies; it should not be extended beyond its original intent. For example, the data base is not designed to:
Table of Contents