کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4491638 1317869 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cattle, ethanol, and biogas: Does closing the loop make economic sense?
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
Cattle, ethanol, and biogas: Does closing the loop make economic sense?
چکیده انگلیسی

The recent surge in US ethanol production has led to an increase in the amount of byproduct feed available to cattle producers. The impetus behind the increase in ethanol production is US policy to increase the production and use of renewable fuels. Manure from cattle production can also be used to produce a renewable fuel: methane. By co-locating a cattle feedlot with an existing ethanol plant, there may be synergies between ethanol, methane and cattle production. Byproduct from the ethanol plant can be fed to feeder cattle, manure from the cattle used in methane production, and the methane used as an energy source in the ethanol plant. Alternatively, methane can be used to generate electricity. We investigate the economic advisability of these systems. Using cost estimates for construction and operating a feedlot and anaerobic digester for methane production, we project revenues and costs over a 20-year time period. Our findings are consistent with studies that have considered just cattle production and methane production. The investment required to build a slatted-floor feedlot and concrete anaerobic digester cannot be justified under existing economic conditions. An increase in renewable fuel/electricity subsidies of at least $0.053 per kW h or $72 per 1000 m3 of methane are required to just break even when methane is used to produce electricity or is burned for thermal energy, respectively.


► We model the costs of installing and operating a methane digester at a cattle feedlot that is co-located with an ethanol plant.
► We find that the added costs are not economically justified by the synergies from co-location.
► A renewable electricity subsidy of $0.053 per kW h is needed to breakeven on the project.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agricultural Systems - Volume 104, Issue 8, October 2011, Pages 609–614
نویسندگان
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