Landfill Air Emissions Estimation Model

What is the Landfill Air Emissions Estimation Model?

The Landfill Air Emissions Model, Beta version (see note under "what are default value sets?" below) is PC-based software for estimating emissions of methane, carbon dioxide, nonmethane organic compounds, and hazardous air pollutants from municipal solid waste landfills. These emissions are generated by decomposition of refuse in landfills. The mathematical model used in Landfill is based on a first order decay equation that can be run using site-specific data supplied by the user for the parameters needed to estimate emissions or, if data are not available, using default value sets included in Landfill.

What are default value sets?

There are two sets of default values in Landfill. One set, the Clean Air Act (CAA) set, is based on requirements of the New Source Performance Standards (NSPS) controlling emissions to the atmosphere from new municipal solid waste landfills or federal emission guidelines for emissions from existing landfills. These regulations and guidelines are contained in the Code of Federal Regulations, Title 40, Part 60, (40CFR60) Subparts WWW and Cc, respectively. This set of default values produce conservative emission estimates that can be used to determine the applicability of Federal regulations or guidelines to the landfill being evaluated. For more information on the assumptions used in the model and the CAA default set, see the Background Information Document (NTIS Number PB91-197061) or public docket (A-88-09) for the landfill NSPS and guidelines.

The other set of values, the AP-42 set, is based on emissions factors in EPA's guidance document, Compilation of Emission Factors, Fifth Edition, AP-42. This set of default values is less conservative than the CAA set and can be used to produce typical emission estimates in the absence of site-specific test data.

Note: The AP-42 values used in this Beta version of Landfill have been revised and are available for public comment. Once AP-42 revisions have been published as final, the AP-42 default set in Landfill will be revised accordingly and the final version of the model will be issued. Although this is a Beta version and subject to additional testing, all software components of Landfill are fully functional.

What Do I Need To Run Landfill?

To use the Landfill program, you need an IBM-compatible personal computer with 4 megabytes of memory, a disk drive, and DOS version 2 or later. To use the Windows version of Landfill, you need Microsoft Windows 3.1 or Windows 95. Things go better if your computer has a 386 processor (or better), a graphical display, and a mouse.

Where Do I Get Landfill?

Right here on the Web! The following links are to the Landfill files contained on the CATC section of the TTNWeb site Select the version of Landfill software you prefer, and download it to your PC. See the ReadMe file for information about installing the software. Download the User's Manual for detailed descriptions of the Landfill model, plus program installation and usage instructions for both DOS and Windows versions.

• Zipped Windows version of Landfill software
• Readme file -- READ THIS FIRST! (landfill.txt, 9 K)
• Zipped Landfill User's Manual
• Landfill User's Manual (landfill.pdf, 1 MB - Adobe Acrobat PDF format)

The .exe files are compressed files that automatically decompress when you run them. See the Readme file for complete installation instructions for the Windows and DOS versions.

Problems?

If you have a question about the Landfill model or a problem using the software, please feel free to contact us. We welcome suggestions for improving Landfill. Send your suggestions, questions, and problem reports to Susan Thorneloe of the US EPA:

E-MAIL: thorneloe.susan@epamail.epa.gov

FAX: (919) 541-2382 or (919) 541-7885

MAIL: U.S. EPA/APPCD, MD-63, RTP, NC 27711

Please include the following information:

• Your name, telephone number, fax number, postal address, and e-mail address.
• Description of the question, suggestion, or problem in as much detail as possible.

If you are reporting a problem, please also include as much of the following information as possible:

• Your computer type, brand, processor/CPU speed, installed RAM, HD size and available space, operating system version, operating mode (for Windows, e.g. Enhanced), available memory (physical and virtual), display adapter type and settings, and attached printer types.

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