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  1. Article: Anaerobic sequential batch reactor for CO-DIGESTION of slaughterhouse residues: Wastewater and activated sludge

    Agabo-García, Cristina / Solera, Rosario / Perez, Montserrat

    Energy. 2022 Sept. 15, v. 255

    2022  

    Abstract: This work aims to determine the potential to produce biomethane by means of an Anaerobic Sequential Batch Reactor used to process two types of slaughterhouse wastes: raw slaughterhouse wastewaters and a sludge obtained after a specific treatment. In this ...

    Abstract This work aims to determine the potential to produce biomethane by means of an Anaerobic Sequential Batch Reactor used to process two types of slaughterhouse wastes: raw slaughterhouse wastewaters and a sludge obtained after a specific treatment. In this study different hydraulic retention times (15, 10, 8, 6, 4 days) were applied and the reactor's performance was evaluated. The behavior of the main parameters associated to biodegradation processes, such as total biomethane production or anaerobic population dynamics were studied. The highest methane production and biodegrading factors removals were achieved when using 10-8 days of hydraulic retention times, obtaining around 0.31 ± 0.03 LCH₄/gCODₜ and 0.51 ± 0.06LCH₄/gTVS with removal percentages between 16 and 22% for COD and between 47 and 34% for TVS thanks to the higher microbial population. Therefore, the proposed AnSBR system has the potential to generate 5.23·10⁵ kW h/year when operating under optimal HRT conditions (HRT 8–10 d). At these conditions, long chain fatty acid hydrolysis limitation are not a problem for a stable AD process performance due to a proper balance of different microbial groups: Eubacteria:Archaea ratio of 2.0; low but stable hydrolytic acidogenic bacteria proportion (13%), high proportion of Acetogens (44%) and preferred acetoclastic methanogen (32%) than hydrogenotropic methanogens (3%). So, the conditioning of the substrate such as pre-treatment of the sludge and the mixture in a proper proportion to the slaughterhouse wastewater achieve optimal organic load and microbial population, that improve the biomethane production in ACoD of Slaughterhouse residues in AnSBR systems during stable operation (HRT 15-8d). Even, a positive linear correlation between organic loading rate and Archaea activity was observed. However, at HRT 6d and 4d hydraulic retention times, the reactors started to suffer destabilization.
    Keywords Archaea ; acetogens ; acid hydrolysis ; activated sludge ; anaerobic digestion ; batch systems ; biodegradation ; biogas ; energy ; long chain fatty acids ; methane production ; methanogens ; population dynamics ; slaughterhouses ; wastewater
    Language English
    Dates of publication 2022-0915
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2019804-8
    ISSN 0360-5442 ; 0360-5442
    ISSN (online) 0360-5442
    ISSN 0360-5442
    DOI 10.1016/j.energy.2022.124575
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  2. Article ; Online: Valorisation of the invasive alga Rugulopteryx okamurae through the production of monomeric sugars

    Agabo-García, Cristina / Romero-García, Luis I. / Álvarez-Gallego, Carlos J. / Blandino, Ana

    Appl Microbiol Biotechnol. 2023 Mar., v. 107, no. 5-6 p.1971-1982

    2023  

    Abstract: Rugulopteryx okamurae is an invasive brown alga causing severe environmental and economic problems on the western Mediterranean coasts. Thus, in addition to the difficulties caused to the fishing and tourism sectors, there is a need to manage its ... ...

    Abstract Rugulopteryx okamurae is an invasive brown alga causing severe environmental and economic problems on the western Mediterranean coasts. Thus, in addition to the difficulties caused to the fishing and tourism sectors, there is a need to manage its accumulation on the beaches. This work aims to valorise this waste by using it as raw material for producing monosaccharides through a two-stage sequential process. These sugars could be used for different fermentative processes to obtain high-value-added bioproducts. In this work, biological pretreatment of the previously conditioned seaweed with the fungus Aspergillus awamori in solid-state fermentation (SSF), followed by enzymatic hydrolysis with a commercial enzyme cocktail, was performed. The effect of the extension of the biological pretreatment (2, 5, 8 and 12 days) on the subsequent release of total reducing sugars (TRS) in the enzymatic hydrolysis stage was studied. To analyse this effect, experimental data of TRS produced along the hydrolysis were fitted to simple first-order kinetics. Also, the secretion of cellulase and alginate lyase by the fungus, along with the biological pretreatment, was determined. The results suggest that 5 days of biological pretreatment of the macroalgae with A. awamori followed by enzymatic saccharification for 24 h with Cellic CTec2® (112 FP units/g of dry biomass) are the best conditions tested, allowing the production of around 240 g of TRS per kg of dried biomass. The main sugars obtained were glucose (95.8 %) and mannitol (1.5 %), followed by galactose (1 %), arabinose (0.9 %) and fucose (0.5 %). KEY POINTS: • Five-day SSF by A. awamori was the best condition to pretreat R. okamurae. • Five-day SSF was optimal for alginate lyase production (1.63 ±0.011 IU/g biomass). • A maximum yield of 239 mg TRS/g biomass was obtained (with 95.8 % glucose).
    Keywords Aspergillus awamori ; Rugulopteryx okamurae ; alginate lyase ; arabinose ; biobased products ; biomass ; endo-1,4-beta-glucanase ; enzymatic hydrolysis ; fucose ; fungi ; galactose ; glucose ; hydrolysis ; macroalgae ; mannitol ; raw materials ; saccharification ; secretion ; solid state fermentation ; tourism ; wastes
    Language English
    Dates of publication 2023-03
    Size p. 1971-1982.
    Publishing place Springer Berlin Heidelberg
    Document type Article ; Online
    ZDB-ID 392453-1
    ISSN 1432-0614 ; 0171-1741 ; 0175-7598
    ISSN (online) 1432-0614
    ISSN 0171-1741 ; 0175-7598
    DOI 10.1007/s00253-023-12402-w
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    In stock of ZB MED Bonn / Germany

    Z 79/727: Show issues

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  3. Article ; Online: Valorisation of the invasive alga Rugulopteryx okamurae through the production of monomeric sugars.

    Agabo-García, Cristina / Romero-García, Luis I / Álvarez-Gallego, Carlos J / Blandino, Ana

    Applied microbiology and biotechnology

    2023  Volume 107, Issue 5-6, Page(s) 1971–1982

    Abstract: Rugulopteryx okamurae is an invasive brown alga causing severe environmental and economic problems on the western Mediterranean coasts. Thus, in addition to the difficulties caused to the fishing and tourism sectors, there is a need to manage its ... ...

    Abstract Rugulopteryx okamurae is an invasive brown alga causing severe environmental and economic problems on the western Mediterranean coasts. Thus, in addition to the difficulties caused to the fishing and tourism sectors, there is a need to manage its accumulation on the beaches. This work aims to valorise this waste by using it as raw material for producing monosaccharides through a two-stage sequential process. These sugars could be used for different fermentative processes to obtain high-value-added bioproducts. In this work, biological pretreatment of the previously conditioned seaweed with the fungus Aspergillus awamori in solid-state fermentation (SSF), followed by enzymatic hydrolysis with a commercial enzyme cocktail, was performed. The effect of the extension of the biological pretreatment (2, 5, 8 and 12 days) on the subsequent release of total reducing sugars (TRS) in the enzymatic hydrolysis stage was studied. To analyse this effect, experimental data of TRS produced along the hydrolysis were fitted to simple first-order kinetics. Also, the secretion of cellulase and alginate lyase by the fungus, along with the biological pretreatment, was determined. The results suggest that 5 days of biological pretreatment of the macroalgae with A. awamori followed by enzymatic saccharification for 24 h with Cellic CTec2® (112 FP units/g of dry biomass) are the best conditions tested, allowing the production of around 240 g of TRS per kg of dried biomass. The main sugars obtained were glucose (95.8 %) and mannitol (1.5 %), followed by galactose (1 %), arabinose (0.9 %) and fucose (0.5 %). KEY POINTS: • Five-day SSF by A. awamori was the best condition to pretreat R. okamurae. • Five-day SSF was optimal for alginate lyase production (1.63 ±0.011 IU/g biomass). • A maximum yield of 239 mg TRS/g biomass was obtained (with 95.8 % glucose).
    MeSH term(s) Sugars ; Phaeophyceae/metabolism ; Seaweed/metabolism ; Cellulase/metabolism ; Glucose ; Biomass ; Fermentation ; Hydrolysis
    Chemical Substances Sugars ; Cellulase (EC 3.2.1.4) ; Glucose (IY9XDZ35W2)
    Language English
    Publishing date 2023-02-03
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 392453-1
    ISSN 1432-0614 ; 0171-1741 ; 0175-7598
    ISSN (online) 1432-0614
    ISSN 0171-1741 ; 0175-7598
    DOI 10.1007/s00253-023-12402-w
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2229: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  4. Article ; Online: First approaches to valorizate fat, oil and grease (FOG) as anaerobic co-substrate with slaughterhouse wastewater: Biomethane potential, settling capacity and microbial dynamics.

    Agabo-García, Cristina / Solera, Rosario / Pérez, Montserrat

    Chemosphere

    2020  Volume 259, Page(s) 127474

    Abstract: Anaerobic digestion (AD) is the biological preferred treatment applied to Slaughterhouse wastewaters (SWW) due to its effectiveness. The aim of the study is to investigate the effect of different percentages of fats, oil and grease (FOG) on biomethane ... ...

    Abstract Anaerobic digestion (AD) is the biological preferred treatment applied to Slaughterhouse wastewaters (SWW) due to its effectiveness. The aim of the study is to investigate the effect of different percentages of fats, oil and grease (FOG) on biomethane production in anaerobic co-digestion with slaughterhouse wastewater using BMP tests under mesophilic conditions (35 °C). For this purpose, three percentages of FOG from 1% to 10% were tested. Biodegradability, biomethane production and the microbial population were studied. In addition, settling capacity has been evaluated at different conditions: i) before and after anaerobic co-digestion; ii) at different temperature 25 °C and 35 °C. The settling rates as well as the characterization of the digestate were recorded. Experimental results showed that all the co-digestion mixtures (FOG percentages = 1-10%) enhanced biomethane production and biodegradability compared to AD of sole SWW. The best conditions were achieved at 5-10% of FOG, showing biodegradability of 66-70% CODt
    MeSH term(s) Abattoirs ; Anaerobiosis ; Bacteria ; Biodegradation, Environmental ; Bioreactors/microbiology ; Fats ; Hydrocarbons ; Methane ; Sewage/chemistry ; Waste Disposal, Fluid/methods ; Waste Water
    Chemical Substances Fats ; Hydrocarbons ; Sewage ; Waste Water ; Methane (OP0UW79H66)
    Language English
    Publishing date 2020-06-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.127474
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2540: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  5. Article: Adaptation of thermophilic sludge-inoculum to co-digestion with Sherry-wine distillery wastewater

    Agabo-García, Cristina / Pérez, Montserrat / Solera, Rosario

    Biomass and bioenergy. 2020 Aug., v. 139

    2020  

    Abstract: In this work, the progression and microbial considerations have been taking into account in the adaptation of thermophilic sludge-inoculum to anaerobic co-digestion of Sherry-wine distillery wastewater (SW-DW) and sewage sludge (SS). For this purpose, ... ...

    Abstract In this work, the progression and microbial considerations have been taking into account in the adaptation of thermophilic sludge-inoculum to anaerobic co-digestion of Sherry-wine distillery wastewater (SW-DW) and sewage sludge (SS). For this purpose, the effect of increasing concentrations of SW-DW as co-substrates with SS was evaluated by measuring biodegradability parameters, biomethane productivity and shift in microbial community. Optimal productivity occurred when 50–75% of SW-DW was used due to consortia adaptation and more soluble compounds obtaining 0.272–0.277 L CH₄·g⁻¹ CODcₒₙₛᵤₘₑd and TSᵣₑₘₒᵥₐₗ: 34.5–38.3%; TVSᵣₑₘₒᵥₐₗ: 51.0–53.2%; CODtᵣₑₘₒᵥₐₗ: 45.5–64.2%. At this both conditions, hydrolytic acidogenic bacteria reach the maximum levels improving the activity of acetogenic bacteria and acetate utilizing methanogens.
    Keywords acetates ; acetogens ; anaerobic digestion ; biodegradability ; biogas ; biomass ; distillery effluents ; methanogens ; microbial communities ; sewage sludge
    Language English
    Dates of publication 2020-08
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 1090121-8
    ISSN 0961-9534
    ISSN 0961-9534
    DOI 10.1016/j.biombioe.2020.105628
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    In stock of ZB MED Bonn / Germany

    Z 5470: Show issues

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  6. Article: First approaches to valorizate fat, oil and grease (FOG) as anaerobic co-substrate with slaughterhouse wastewater: Biomethane potential, settling capacity and microbial dynamics

    Agabo-García, Cristina / Solera, Rosario / Pérez, Montserrat

    Chemosphere. 2020 Nov., v. 259

    2020  

    Abstract: Anaerobic digestion (AD) is the biological preferred treatment applied to Slaughterhouse wastewaters (SWW) due to its effectiveness. The aim of the study is to investigate the effect of different percentages of fats, oil and grease (FOG) on biomethane ... ...

    Abstract Anaerobic digestion (AD) is the biological preferred treatment applied to Slaughterhouse wastewaters (SWW) due to its effectiveness. The aim of the study is to investigate the effect of different percentages of fats, oil and grease (FOG) on biomethane production in anaerobic co-digestion with slaughterhouse wastewater using BMP tests under mesophilic conditions (35 °C). For this purpose, three percentages of FOG from 1% to 10% were tested. Biodegradability, biomethane production and the microbial population were studied. In addition, settling capacity has been evaluated at different conditions: i) before and after anaerobic co-digestion; ii) at different temperature 25 °C and 35 °C. The settling rates as well as the characterization of the digestate were recorded. Experimental results showed that all the co-digestion mixtures (FOG percentages = 1–10%) enhanced biomethane production and biodegradability compared to AD of sole SWW. The best conditions were achieved at 5–10% of FOG, showing biodegradability of 66–70% CODtᵣₑₘₒᵥₐₗ and specific biomethane productions of 562 and 777 mLCH₄·g⁻¹CODₛᵣₑₘₒᵥₑd, respectively. Regarding microbial dynamics, Eubacteria was reduced with the increase in %FOG but Acetate utilizing methanogens was increased. Regarding settling capacity, mesophilic temperatures (35 °C) increased the settling rate of digestate in 1.76 times and reduced the lag-phase to 0.92 min; obtaining a more concentrated sludge and leaving a clarified whose TSS represent only 8% of TS.
    Keywords Eubacteria ; acetates ; anaerobic digestion ; biodegradability ; biogas ; lipids ; methane ; methanogens ; oils ; slaughterhouses ; sludge ; temperature ; wastewater
    Language English
    Dates of publication 2020-11
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.127474
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2540: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  7. Article: Improvement of biomethane potential of sewage sludge anaerobic co-digestion by addition of “sherry-wine” distillery wastewater

    Ripoll, Vanessa / Agabo-García, Cristina / Perez, Montserrat / Solera, Rosario

    Journal of cleaner production. 2020 Apr. 01, v. 251

    2020  

    Abstract: Co-digestion of sewage sludge (SS) with other unusually treated residues has been reported as an efficient method to improve biomethane production. In this work, Sherry-wine distillery wastewater (SW-DW) has been proposed as co-substrate in order to ... ...

    Abstract Co-digestion of sewage sludge (SS) with other unusually treated residues has been reported as an efficient method to improve biomethane production. In this work, Sherry-wine distillery wastewater (SW-DW) has been proposed as co-substrate in order to increase biomethane production and as a breakthrough solution in the management of both types of waste. In order to achieve this goal, different SS:SW-DW mixtures were employed as substrates in Biomethane Potential (BMP) tests. The biodegradability and biomethane potential of each mixture was determined selecting the optimal co-substrate ratio. Results showed that the addition of SW-DW as a co-substrate improves the anaerobic digestion of SS in a proportionally way in terms of CODs and biomethane production The optimal co-substrates ratio was 50:50 of SS:SW-DW obtaining %VSremoval = 54.5%; YCH4 = 225.1 L CH4/kgsv or 154 L CH4/kgCODt and microbial population of 5.5 times higher than sole SS. In this case, %VSremoval = 48.1%; YCH4 = 183 L CH4/kgsv or 135 L CH4/kgCODt. The modified Gompertz equation was used for the kinetic modelling of biogas production with successful fitting results (r2 = 0.99). In this sense, at optimal conditions, the maximum productivity reached at an infinite digestion time was (YCH4MAX) = 229 ± 5.0 NL/kgSV; the specific constant was K = 25.0 ± 2.3 NL/kgSV·d and the lag phase time constant was (λ) = 2.49 ± 0.19.
    Keywords anaerobic digestion ; biodegradability ; biogas ; chemical oxygen demand ; distillery effluents ; equations ; gas production (biological) ; methane ; models ; sewage sludge
    Language English
    Dates of publication 2020-0401
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0959-6526
    DOI 10.1016/j.jclepro.2019.119667
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