The impact of four design parameters on the performance of a high‐solids anaerobic digestion of municipal solid waste for fuel gas production

Kayhanian, Masoud; Hardy, Scott A.

doi:10.1080/09593339409385461

Cited by 52 publications

(17 citation statements)

References 10 publications

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“…The chemical characteristics of this feedstock are presented in Table III. The feed had an average TS concentration of approximately 70 g/kg (7% TS), which is significantly higher than the %TS of sewage sludge typically digested in an anaerobic digester [solids content of the primary sludge, unthickened WAS, and thickened WAS are approximately 5, 0.8, and 5%, respectively (Metcalf and Eddy, 1991)], but lower than the values reported in some recent publications on high solids digestion of OFMSW [30% TS (Rivard, 1993), 20-30% TS (Kayhanian and Hardy, 1994), and 16-23% TS (Cecchi et al, 1991)]. A large percentage of the TS was organic (88% VS).…”

Section: Feedstockmentioning

confidence: 76%

“…Although several other researchers have studied MSW digestion (Cecchi et al, 1991;Kayhanian and Hardy, 1994;Rivard et al, 1993;Six and de Baere, 1992) and codigestion systems (Poggi-Varaldo and Oleszkiewicz, 1992;Rivard et al, 1990;Stenstrom et al, 1983), none have characterized changes in microbial community structure during start-up of these systems. Here, we emphasize the importance of evaluating the microbial community structure in combination with chemical and physical parameters to assess digester performance during the startup period.…”

Section: Production Of Municipal Solid Waste (Msw) In the Unitedmentioning

confidence: 97%

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Methanogenic population dynamics during start-up of anaerobic digesters treating municipal solid waste and biosolids

Griffin

McMahon

Mackie

et al. 1998

Biotechnol. Bioeng.

335

200

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Section: Feedstockmentioning

confidence: 76%

Section: Production Of Municipal Solid Waste (Msw) In the Unitedmentioning

confidence: 97%

Methanogenic population dynamics during start-up of anaerobic digesters treating municipal solid waste and biosolids

Griffin

McMahon

Mackie

et al. 1998

Biotechnol. Bioeng.

335

200

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“…This waste mix was chosen as it resembles that found in the organic fraction of MSW (Kayhanian and Hardy, 1994). The use of the sodium bicarbonate buffer solution maintained the pH of the reactor between 7 and 8.…”

Section: Reactor Operationmentioning

confidence: 99%

Structure of a cellulose degrading bacterial community during anaerobic digestion

O’Sullivan

Burrell

Clarke

et al. 2005

Biotech & Bioengineering

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It is widely accepted that cellulose is the rate-limiting substrate in the anaerobic digestion of organic solid wastes and that cellulose solubilisation is largely mediated by surface attached bacteria. However, little is known about the identity or the ecophysiology of cellulolytic microorganisms from landfills and anaerobic digesters. The aim of this study was to investigate an enriched cellulolytic microbial community from an anaerobic batch reactor. Chemical oxygen demand balancing was used to calculate the cellulose solubilisation rate and the degree of cellulose solubilisation. Fluorescence in situ hybridisation (FISH) was used to assess the relative abundance and physical location of three groups of bacteria belonging to the Clostridium lineage of the Firmicutes that have been implicated as the dominant cellulose degraders in this system. Quantitation of the relative abundance using FISH showed that there were changes in the microbial community structure throughout the digestion. However, comparison of these results to the process data reveals that these changes had no impact on the cellulose solubilisation in the reactor. The rate of cellulose solubilisation was approximately stable for much of the digestion despite changes in the cellulolytic population. The solubilisation rate appears to be most strongly affected by the rate of surface area colonisation and the biofilm architecture with the accepted model of first order kinetics due to surface area limitation applying only when the cellulose particles are fully covered with a thin layer of cells.

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“…A number of researchers have suggested that this could be achieved by particle size reduction to allow more rapid reaction rates through increasing the surface area exposed to microbial attack (Chynoweth and Pullammanappallil, 1996;Hartmann and Ahring, 2006;Hills and Nakano, 1984;Kayhanian and Hardy, 1994;Sanders et al, 2000;Sharma et al, 1988;Yadvika et al, 2004). Other research has questioned the benefits of size reduction and drawn attention to other important factors.…”

Section: Introductionmentioning

confidence: 99%

Impact of different particle size distributions on anaerobic digestion of the organic fraction of municipal solid waste

2013

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Particle size may significantly affect the speed and stability of anaerobic digestion, and matching the choice of particle size reduction equipment to digester type can thus determine the success or failure of the process. In the current research the organic fraction of municipal solid waste was processed using a combination of a shear shredder, rotary cutter and wet macerator to produce streams with different particle size distributions. The pre-processed waste was used in trials in semi-continuous 'wet' and 'dry' digesters at organic loading rate (OLR) up to 6 kg volatile solids (VS) m -3 day -1 .The results indicated that while difference in the particle size distribution did not change the specific biogas yield, the digester performance was affected. In the 'dry' digesters the finer particle size led to acidification and ultimately to process failure at the highest 1 * Corresponding author: Tel.: +44 (0)2380 592188; fax: +44 (0)2380 677519; E-mail address: Y.Zhang@soton.ac.uk (Yue Zhang) 2 OLR. In 'wet' digestion a fine particle size led to severe foaming and the process could not be operated above 5 kg VS m -3 day -1 . Although the trial was not designed as a direct comparison between 'wet' and 'dry' digestion, the specific biogas yield of the 'dry' digesters was 90% of that produced by 'wet' digesters fed on the same waste at the same OLR.

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The impact of four design parameters on the performance of a high‐solids anaerobic digestion of municipal solid waste for fuel gas production

Cited by 52 publications

References 10 publications

Methanogenic population dynamics during start-up of anaerobic digesters treating municipal solid waste and biosolids

Methanogenic population dynamics during start-up of anaerobic digesters treating municipal solid waste and biosolids

Structure of a cellulose degrading bacterial community during anaerobic digestion

Impact of different particle size distributions on anaerobic digestion of the organic fraction of municipal solid waste

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