Evaluation of systems for purification of fuel gas from anaerobic digestion. Engineering report

Ashare, E.; Augenstein, Don; Yeung, J. C.; Hossan, R. J.; Duret, G. L.

doi:10.2172/5766778

Cited by 4 publications

(2 citation statements)

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“…The energy requirements for C02 scrubbing and CH4 compression are also listed in Table 4.5. Ashare et al (1978) concluded that the water scrubbing of C02 is the simplest and cheapest way to clean the biogas.The power requ i red was es ti mated to be 5.88 vJ /m3 / day of the bi ogas flow rate. The net power required to compress the methane gas from 101.3 kPa (1 atmosphere) to 861 kPa (8.5 atmosphere) was used.…”

Section: Mixing Power Requirementmentioning

confidence: 99%

Anaerobic fermentation of beef cattle manure. Final report

Hashimoto¹,

Chen²,

Varel³

1981

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This report summarizes the research being conducted at the Roman L. Hruska U.S. Meat Animal Research Center to convert livestock manure and crop residues into methane and a high protein feed ingredient by thermophilic anaerobic fermentation. The major biological and operational factors involved in methanogenesis were discussed, and a kinetic model that describes the fermentation process was presented. Substrate biodegradability, fermentation temperature, and influent substrate concentration were shown to have significant effects on CH4 production rate. The kinetic model predicted methane production rates of existing pilot and full-scale fermentation systems to within 15%. The 5.7 m 3 fermentor was operated at: temperatures of 45, 50 and 55°C; hydraulic retention times ranging from 12 to 4 days; mixed continuously or 2 hr/day; and fed once/day or 22 times/day. No difference in methane production rate was observed when the fermentor was mixed 2 hr/day versus continuously. The methane production rate was about 10% higher when the fermentor was fed 22 times/day compared with once/day. The highest methane production rate achieved by the fermentor was 4.7 L CH4/L fermentor•day. This is the highest rate reported in the literature and about 4 times higher than other pilot or full-scale systems fermenting livestock manures. Assessment of the energy requirements for anaerobic fermentation systems showed that the major energy requi rement for a thermophi 1 i c system was for maintaining the fermentor temperature. Of the total heating energy required, about 89 to 94% was for heating the influent slurry at an ambient temperature of 10°C. The next major energy consumption was due to the mixing of the influent slurry and fermentor liquor. Mixing amounted to 7.3% of the gross methane energy production, assuming continuous mixing. The least energy was consumed in pumping. The total energy required for mixing and pumping accounted for 10.8 to 11.3% of the gross thermal energy production. An approach to optimizing anaerobic fermentor designs by selecting design criteria that maximize the net energy production per unit cost was presented. Using this optimization technique, we estimated that a farmer-constructed and operated system would be economically feasible for beef feedlots between 1,000 to 2,000 head without a feed credit assumed for the effluent, and about 300 head with a feed credit of $60/~1g effluent total solids. Commercial "turn-key" systems are only feasible for feedlots larger than 8,000 head with no effluent credit, and feedlots between 1,000 to 2,000 head with an effluent credit of $60/t~g. Based on these results, we bel i eve that the economi cs of anaerobic fermentation is sufficiently favorable for farm-scale demonstration of this technology.

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Section: Mixing Power Requirementmentioning

confidence: 99%

Anaerobic fermentation of beef cattle manure. Final report

Hashimoto¹,

Chen²,

Varel³

1981

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“…Die Aufbereitungskosten fur konventionelle Verfahren wurden einer amerikanischen Studie entnommen[3]. Fur glasartige Polymere unerwartet nehmen die Permeabilitatskoeffizienten mit dem Druck zu.…”

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Die selektive Gaspermeation im Vergleich mit konventionellen Entsäuerungsverfahren für Naturgase

Behlau

Finken

1984

Chemie Ingenieur Technik

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I'* = 1 m3/m2 h bar.In dieser Arbeit wird versucht, die Fragen zu beantworten, ob das Verfahren der selektiven Gaspermeation durch die Entwicklung verbesserter asymmetrischer Membranen aus technischer Sicht fur die Entsauerung von Naturgasen geeignet ist und ob dieses neue Verfahren daruber hinaus auch noch kostengunstiger ist als vergleichbare konventionelle Adsorptions-oder Absorptionsverfahren.

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