Biogas

February 4, 2009

TECHNICAL SUPPORT DOCUMENT FOR MANURE MANAGEMENT SYSTEMS: PROPOSED RULE FOR MANDATORY REPORTING OF GREENHOUSE GASES

NOTE: EPA will not be implementing subpart JJ of the Mandatory GHG Reporting Rule using funds provided in its FY2010 appropriations due to a Congressional restriction prohibiting the expenditure of funds for this purpose.

Climate Change Division Office ofAtmospheric Programs U.S. Environmental Protection Agency

February 4, 2009

CONTENTS 1. 2. 3. 4. Industry Description................................................................................................................... 3 Total Emissions.......................................................................................................................... 3 Review of ExistingPrograms and Methodologies..................................................................... 3 Types of Emissions Information to be Reported ....................................................................... 4 4.1 Types of Emissions to be Reported ................................................................................. 4 4.2 Other Information to beReported.................................................................................... 4 Options for Reporting Threshold ............................................................................................... 5 5.1 Emissions-based Thresholds............................................................................................. 5 5.2 Other ThresholdOptions................................................................................................... 9 Options for Monitoring Methods ............................................................................................. 10 6.1 Calculating Methane Generation ................................................................................... 10 6.2 Calculating Methane Generation ofDigesters............................................................... 12 6.3 Calculating Methane Destruction and Leakage of Digesters......................................... 13 6.4 Calculating Nitrous Oxide Emissions............................................................................ 14 6.5 Calculating Generation and Emissions ........................................................................... 15 6.6 Calculating CH4 Generation and EmissionsUsing Digester Gas Collection Data........ 15 6.7 Direct Measurement of Emissions ................................................................................. 15 Options for Estimating Missing Data ...................................................................................... 15 QA/QCRequirements.............................................................................................................. 16 References................................................................................................................................ 17

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Appendix A. Additional information........................................................................................... 18 Table A-1. Manure Management SystemDescriptions....................................................... 18 Table A-2. Waste Characteristics Data................................................................................ 19 Table A-3. Methane Conversion Factors ............................................................................. 20 Table A-4. Collection Efficiencies of Anaerobic Digesters ................................................ 21 Table A-5. NitrousOxide Emission Factors........................................................................ 21

Note: EPA will not be implementing subpart JJ of the Mandatory GHG Reporting Rule using funds provided in its FY2010 appropriations due to a Congressional restriction prohibiting the expenditure of funds for this purpose. 2

1. Industry Description This source category consists of manure...