Evaluation of a two stage anaerobic digester for the treatment of mixed abattoir wastes

Wang, Zhengjian; Banks, C.J.

doi:10.1016/s0032-9592(02)00324-2

Cited by 73 publications

(39 citation statements)

References 7 publications

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“…The elevated ammonia/ammonium concentration provides buffering capacity that allows digester operation at higher concentrations of volatile fatty acids (VFA) than would be possible in a less buffered system [10][11][12]; it is only when this buffering capacity is broken by acid accumulation that the pH drops to a point where conditions are unfavourable for methano genesis. This behaviour has also been seen in the digestion of other nitrogen-rich materials such as cattle slurry [13] and slaughterhouse waste [14]. It would be advantageous to be able to manage the ammonia concentrations in AD such that the problems of its accumulation are avoided, in turn preventing the build-up of VFA.…”

Section: Introductionmentioning

confidence: 83%

Ammonia removal in anaerobic digestion by biogas stripping: An evaluation of process alternatives using a first order rate model based on experimental findings

Walker

Iyer

Heaven

et al. 2011

Chemical Engineering Journal

132

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Section: Introductionmentioning

confidence: 83%

Ammonia removal in anaerobic digestion by biogas stripping: An evaluation of process alternatives using a first order rate model based on experimental findings

Walker

Iyer

Heaven

et al. 2011

Chemical Engineering Journal

132

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“…However, the process is sensitive and prone to failure [3,4]. Degradation of long chain fatty acids (LCFA) has proved to be the limiting step in the hydrolysis process, and their accumulation results in toxicity problems for acetogenic bacteria and methanogenic archaea [5,6].…”

Section: Introductionmentioning

confidence: 99%

Anaerobic co-digestion of solid slaughterhouse wastes with agro-residues: Synergistic and antagonistic interactions determined in batch digestion assays

Pagés‐Díaz

Reyes

Taherzadeh

et al. 2014

Chemical Engineering Journal

142

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Please cite this article as: J.P. Díaz, I.P. Reyes, M.J. Taherzadeh, I.S. Horváth, M. Lundin, Anaerobic co-digestion of solid slaughterhouse wastes with agro-residues: Synergistic and antagonistic interactions determined in batch digestion assays, Chemical Engineering Journal (2014), doi: http://dx.doi.org/10. 1016/j.cej.2014.02.008 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractDifferent mixture ratios of solid cattle slaughterhouse wastes (SB), manure (M), various crops (VC), and municipal solid wastes (MSW) were investigated for biogas production. The objective was to explore possible significant synergistic effects obtained from the combination of these different substrates. The performance of the process was assessed in thermophilic anaerobic batch co-digestion assays, using a four factor mixture design and methane yield (Y CH4 ) and specific methane production rate (r sCH4 ) as response variables.The highest methane yield, 655 NmL CH 4 /g VS was obtained when equal parts (ww) of SB, M, VC, and MSW were combined, while the combination of SB, M, and MSW resulted in the highest specific methane production rate (43 NmL CH 4 /g VS/d). A mixture design model was fitted to data in order to appraise synergistic and antagonistic interactions. Mixing all four substrates resulted in a 31% increase of the expected yield which was calculated from the methane potential of the individual fractions, clearly demonstrating a synergistic effect due to more balanced nutrient composition enhancing the anaerobic digestion process. However, no significant antagonistic effects were observed. In order to maximize both response variables simultaneously, a response surface method was employed to establish the optimal combination of substrate mixtures. The statistical results and analysis of the biological process gave a coherent picture of the results.

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“…Two-phase AD systems plus co-digestion have been suggested for the treatment of waste streams containing high levels of lipids such as kitchen waste (Li et al 2010;Yang et al 2013;Zhang et al 2007), dairy waste (Demirer and Chen 2005;Ince 1998), ice cream factory effluents (Borja and Banks 1995), fish meal processing waste (Guerrero et al 1999), slaughterhouse waste (Wang and Banks 2003) or olive mill solid waste (Beccari et al 1998;Borja et al 2002;Travieso et al 2008). These studies have illustrated the potential advantages of two-phase AD over single-phase systems when treating complex substances, e.g.…”

Section: Introductionmentioning

confidence: 99%

Two-phase anaerobic co-digestion of used vegetable oils’ wastes and pig manure

Hidalgo

Gómez

Martín-Marroquín

et al. 2014

Int. J. Environ. Sci. Technol.

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The purpose of this work was to study the anaerobic co-digestion of all the by-products generated during the processing of used vegetable oils (UVO) with the objective of proposing a solution for the treatment of these wastes. More specifically, this study investigates the advantages of two-phase anaerobic digestion for treating a mixture (1/5 v/v) of UVO processing wastes (OW) and pig manure (PM) using two semi-continuous digesters operated at mesophilic temperature (37 ± 1°C). The experiments were conducted at hydraulic retention time (HRT) of 0.5, 1, 2 and 4 days in the first stage (acidifier) and at HRT of 11.5, 15, 18 and 20 days in the second stage (methaniser). The results revealed that the HRT had a high influence on the soluble chemical oxygen demand (sCOD) and total dissolved solids (TDS) removal. The maximum total sCOD removal efficiency of 86.4 % and TDS removal efficiency of 81.9 % was achieved at 20 days of global HRT. The maximum biogas production of 0.65 m 3 per kilogramme of volatile dissolved solids (VDS) was removed, corresponding to a methane production of 0.42 m 3 CH 4 kg -1 . VDS removed (65 % CH 4 ) was also achieved at 20 days of HRT. The two-phase digestion system showed good stability, which was mainly attributed to the strong buffering capacity with the two-phase system and the high alkalinity from PM when co-digested with OW. The results obtained from this study provide fundamental information for scaling up a high-performance two-phase anaerobic system in the future.

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Evaluation of a two stage anaerobic digester for the treatment of mixed abattoir wastes

Cited by 73 publications

References 7 publications

Ammonia removal in anaerobic digestion by biogas stripping: An evaluation of process alternatives using a first order rate model based on experimental findings

Ammonia removal in anaerobic digestion by biogas stripping: An evaluation of process alternatives using a first order rate model based on experimental findings

Anaerobic co-digestion of solid slaughterhouse wastes with agro-residues: Synergistic and antagonistic interactions determined in batch digestion assays

Two-phase anaerobic co-digestion of used vegetable oils’ wastes and pig manure

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