An Engineering-Economic Model for Analyzing Dairy Plug-Flow Anaerobic Digesters: Cost Structures and Policy Implications Faulhaber, Carol Raman, D. Raj Raman, D. Burns, Robert
dc.contributor.department Agricultural and Biosystems Engineering 2018-02-13T03:43:25.000 2020-06-29T22:41:11Z 2020-06-29T22:41:11Z Sun Jan 01 00:00:00 UTC 2012 2012-12-07 2012-01-01
dc.description.abstract <p>Treating animal wastes through anaerobic digestion (AD) yields methane-rich biogas that can be used for power generation or heating, and a nutrient-rich digestate that can be land-applied as fertilizer. Furthermore, AD reduces odors from stored and land-applied manures. Despite these benefits, AD deployment rates in the U.S. are only 5% for dairy farms identified as suitable for AD by the U.S. Environmental Protection Agency. The objective of this study was to analyze the economic and technical limitations of farm-scale anaerobic digesters using a simple model permitting insight into the fundamental constraints on the technology. A model was developed to determine the cost of methane produced via AD based on operation size. Dairy plug-flow systems were modeled because of their well-documented economic performance, and model validation used data from AgSTAR's FarmWare program. The analysis shows that farm size is critical to make digestion-derived methane cost-competitive with natural gas. At low herd sizes (<400 >animals), carbon credits and odor reductions alone appear insufficient to overcome the low commercial energy rates in the U.S. However, moderate reductions in digester cost and interest rate, coupled with moderate increases in amortization period and/or natural gas prices, could make AD more competitive with commercial energy in the U.S. even at relatively small herd sizes (approx. 400 animals).</p>
dc.description.comments <p>This article is from <a href="" target="_blank"><em>Transactions of the ASABE</em></a>, 55, no. 1 (2012): 201–209.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1052
dc.identifier.contextkey 3522271
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/60
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 01:13:40 UTC 2022
dc.source.uri 10.13031/2013.41247
dc.subject.disciplines Agricultural and Resource Economics
dc.subject.disciplines Agricultural Economics
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Anaerobic digestion
dc.subject.keywords Economics
dc.subject.keywords Economy of scale
dc.subject.keywords Renewable energy
dc.subject.keywords Scale factor
dc.title An Engineering-Economic Model for Analyzing Dairy Plug-Flow Anaerobic Digesters: Cost Structures and Policy Implications
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 0d20027b-c384-4033-aafe-d7cf62e10240
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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