| 1. |
- Pagés Díaz, Jhosané, et al.
(författare)
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A comparison of process performance during the anaerobic mono-and co-digestion of slaughter house waste through different operational modes
- 2017
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Ingår i: Journal of Environmental Sciences(China). - : Elsevier BV. - 1001-0742 .- 1878-7320.
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Tidskriftsartikel (refereegranskat)abstract
- The use of consecutive feeding was applied to investigate the response of the microbial biomass to a second addition of substrates in terms of biodegradation using batch tests as a promising alternative to predict the behavior of the process. Anaerobic digestion (AD) of the slaughterhouse waste (SB) and its co-digestion with manure (M), various crops (VC), and municipal solid waste were evaluated. The results were then correlated to previous findings obtained by the authors for similar mixtures in batch and semi-continuous operation modes. AD of the SB failed showing total inhibition after a second feeding. Co-digestion of the SB + M showed a significant improvement for all of the response variables investigated after the second feeding, while co-digestion of the SB + VC resulted in a decline in all of these response variables. Similar patterns were previously detected, during both the batch and the semi-continuous modes.
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| 2. |
- Pagés Díaz, Jhosané, et al.
(författare)
-
An approach to the codigestion process of solid slaughterhouse waste, manure, various crop and municipal solid waste
- 2011
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A codigestion process was evaluated when mixing different ratios of agro-industrial residues, i.e. slaughterhouse waste (SB); manure (M); various crop residues (VC); and municipal solid waste (MSW). Methane yield (YCH4) and specific methanogenic activity (SMA) were determined by anaerobic batch digestion of the different substrates and substrate mixtures. The performance of the codigestion was also evaluated by kinetics (k0) based on the methane production rate. The investigated residues and their mixtures were found to have high potentials for the production of biogas. The codigestion process showed to be a feasible option with positive influence in both energy production and environmental care. Taking into account significance differences, the best results were obtained with a mixture ratio of 1:3:4:0.5 based on the w/w content of SB, M, VC, and MSW, respectively, which showed a proper combination of high values in YCH4, SMA and k0 during the anaerobic process. The effect of temperature suggested that thermophilic conditions are suitable to treat these residues. Response variables were severely affected by mesophilic conditions, diminishing in at least 45% of the thermophilic value when a mixture ratio of 2:3:3:0 based on the w/w content of SB:M:VC:MSW was selected. It is suggested to study the influence of individual component within the mixture for every response variable. Consecutive feedings are also suggested in order to step forward to continuous process and evaluate possible inhibitions.
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| 3. |
- Pagés Díaz, Jhosané, et al.
(författare)
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Anaerobic co-digestion of solid slaughterhouse wastes with agro-residues : Synergistic and antagonistic interactions determined in batch digestion assays
- 2014
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Ingår i: Chemical Engineering Journal. - : Elsevier. - 1385-8947 .- 1873-3212. ; 245, s. 89-98
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Tidskriftsartikel (refereegranskat)abstract
- Different 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 CH4/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 CH4/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. (C) 2014 Elsevier B.V. All rights reserved.
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| 4. |
- Pagés Díaz, Jhosané, et al.
(författare)
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Co-digestion of different waste mixtures from agro-industrial activities : Kinetic evaluation and synergetic effects
- 2011
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Ingår i: Bioresource Technology. - : Elsevier BV. - 0960-8524 .- 1873-2976. ; 102:23, s. 10834-10840
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Several wastes from agro-industrial activities were mixed in different ratios to evaluate the co-digestion process. Methane yield (YCH4), specific methanogenic activity (SMA) and a kinetic parameter (k0) were determined. A second feeding was also performed to examine the recovery of bacterial activity after exhaustion. Mixture ratios of 1:1:1:1 and 1:3:4:0.5 (w/w) showed the best performance, with YCH4 of 664; 582 NmL CH4/gVSsubstrate, as well as SMA of 0.12; 0.13 gCODNmLCH4/gVSinoculum/d, respectively, during the digestion of the first feed. It was possible to relate synergetic effects with enhancement in YCH4 by up to 43%, compared with values calculated from YCH4 of the individual substrates. All batches started up the biogas production after an exhaustion period, when a second feed was added. However, long lag phases (up to 21 days) were observed due to stressed conditions caused by the substrate limitation prior to the second feed.
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| 5. |
- Pereda Reyes, Ileana, et al.
(författare)
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Anaerobic Biodegradation of Solid Substrates from Agroindustrial Activities—Slaughterhouse Wastes and Agrowastes
- 2015
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Ingår i: Biodegradation and Bioremediation of Polluted Systems -. - Croatia : INTECH. - 9789535122388 ; , s. 31-64
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Solid wastes from the meat industry are produced in large amounts resulting in a negative impact on the environment if not properly treated. Due to their high content of proteins and fats, these residues are excellent substrates for anaerobic digestion which holds high potential for methane yield. However, possible toxic compounds may be formed during its biodegradation with a consequent failure of the process under long-term operation. The anaerobic co-digestion of such residues with other co-substrates as those generated in agricultural activities has been proposed as a good alternative to overcome these problems. Nevertheless, today there is very little knowledge to assess on mixture interactions connected to wastes composition, biodegradability, and the kinetics of the anaerobic process when complex materials are utilized in ternary and quaternary mixture, specifically when co-digesting solid cattle slaughterhouse waste with agrowaste. It is therefore important to select the right combination of substrates and ratios to obtain synergy instead of antagonism in those mixtures. This chapter aims to provide an overview of the anaerobic digestion of solid slaughterhouse waste and agrowaste, as well as the influence of mixture interactions on its biodegradation.
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