Fuel gas production from animal residue. Dynatech report No. 1551

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A comprehensive mathematical model description of anaerobic digestion of animal residues was developed, taking into account material and energy balances, kinetics, and economics of the process. The model has the flexibility to be applicable to residues from any size or type of animal husbandry operation. A computer program was written for this model and includes a routine for optimization to minimum unit gas cost, with the optimization variables being digester temperature, retention time, and influent volatile solids concentration. The computer program was used to determine the optimum base-line process conditions and economics for fuel gas production via anaerobic digestion of ... continued below

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Pages: 210

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Ashare, E.; Wise, D.L. & Wentworth, R.L. January 14, 1977.

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Description

A comprehensive mathematical model description of anaerobic digestion of animal residues was developed, taking into account material and energy balances, kinetics, and economics of the process. The model has the flexibility to be applicable to residues from any size or type of animal husbandry operation. A computer program was written for this model and includes a routine for optimization to minimum unit gas cost, with the optimization variables being digester temperature, retention time, and influent volatile solids concentration. The computer program was used to determine the optimum base-line process conditions and economics for fuel gas production via anaerobic digestion of residues from a 10,000 head environmental beef feedlot. This feedlot at the conditions for minimum unit gas cost will produce 300 MCF/day of methane at a cost of $5.17/MCF (CH/sub 4/), with a total capital requirement of $1,165,000, a total capital investment of $694,000, and an annual average net operating cost of $370,000. The major contributions to this unit gas cost are due to labor (37 percent), raw manure (11 percent), power for gas compression (10 percent), and digester cost (13 percent). A conceptual design of an anaerobic digestion process for the baseline conditions is presented. A sensitivity analysis of the unit gas cost to changes in the major contributions to unit gas cost was performed, and the results of this analysis indicate areas in the anaerobic digestion system design where reasonable improvements could be expected so as to produce gas at an economically feasible cost. This sensitivity analysis includes the effects on unit gas cost of feedlot size and type, digester type, digester operating conditions, and economic input data.

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Pages: 210

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Dep. NTIS, PC A10/MF A01.

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  • Report No.: COO/2991-10
  • Grant Number: EY-76-C-02-2991
  • DOI: 10.2172/5445541 | External Link
  • Office of Scientific & Technical Information Report Number: 5445541
  • Archival Resource Key: ark:/67531/metadc1071091

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • January 14, 1977

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 27, 2018, 7:02 p.m.

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Ashare, E.; Wise, D.L. & Wentworth, R.L. Fuel gas production from animal residue. Dynatech report No. 1551, report, January 14, 1977; United States. (digital.library.unt.edu/ark:/67531/metadc1071091/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.