A comparison of biological, enzymatic, chemical and hydrothermal pretreatments for producing biomethane from Agave bagasse

Valdez‐Vazquez, Idania; Alatriste‐Mondragón, Felipe; Arreola-Vargas, Jorge; Buitrón, Germán; Carrillo‐Reyes, Julián; León-Becerril, Elizabeth; Méndez‐Acosta, Hugo Oscar; Ortíz, Irmene; Weber, Bernd

doi:10.1016/j.indcrop.2020.112160

Cited by 33 publications

(15 citation statements)

References 49 publications

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“…Hydrogen production by dark fermentation is considered a promising biotechnological process towards the establishment of lignocellulosic biorefineries due to its high-efficient conversion to electricity. Agave bagasse hydrolysates have demonstrated to be a feasible feedstock for hydrogen production [76]. In this sense, acid and enzymatic hydrolysates of A. tequilana bagasse were digested at different concentrations 20-100% v/v to produce hydrogen [24].…”

Section: Hydrogen and Methane Productionmentioning

confidence: 99%

“…For methane, previous studies have used an A. tequilana bagasse as a raw material to produce biogas, obtaining a constant rate of methane production of 0.26 L CH 4 per g COD [23]. Other pretreatments have also shown to be efficient for methane production, among these, dilute acid and ozone-assisted hydrolysis had the highest methane yield when compared with enzymatic techniques [76]. Alkaline hydrogen peroxide (AHP) pretreatment followed by enzymatic hydrolysis (cellulases + hemicellulases) also improved the hydrogen and methane production from the A. tequilana bagasse.…”

Section: Hydrogen and Methane Productionmentioning

confidence: 99%

“…In this step, fibers are extracted by hydrolysis of the lignin and hemicellulose. Acid hydrolysis depolymerizes the lignocellulosic material, increasing the amorphous cellulose, which favors the release of sugars and improves their digestibility and fermentability [19,76,94]. Diluted acid is the most effective way to achieve high efficiency in hemicellulose depolymerization, but also to degrade the amorphous regions and to obtain cellulose nanocrystals [39].…”

Section: Chemical Pretreatmentsmentioning

confidence: 99%

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Agave By-Products: An Overview of Their Nutraceutical Value, Current Applications, and Processing Methods

et al. 2021

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Agave, commonly known as “maguey” is an important part of the Mexican tradition and economy, and is mainly used for the production of alcoholic beverages, such as tequila. Industrial exploitation generates by-products, including leaves, bagasse, and fibers, that can be re-valorized. Agave is composed of cellulose, hemicellulose, lignin, fructans, and pectin, as well as simple carbohydrates. Regarding functional properties, fructans content makes agave a potential source of prebiotics with the capability to lower blood glucose and enhance lipid homeostasis when it is incorporated as a prebiotic ingredient in cookies and granola bars. Agave also has phytochemicals, such as saponins and flavonoids, conferring anti-inflammatory, antioxidant, antimicrobial, and anticancer properties, among other benefits. Agave fibers are used for polymer-based composite reinforcement and elaboration, due to their thermo-mechanical properties. Agave bagasse is considered a promising biofuel feedstock, attributed to its high-water efficiency and biomass productivity, as well as its high carbohydrate content. The optimization of physical and chemical pretreatments, enzymatic saccharification and fermentation are key for biofuel production. Emerging technologies, such as ultrasound, can provide an alternative to current pretreatment processes. In conclusion, agaves are a rich source of by-products with a wide range of potential industrial applications, therefore novel processing methods are being explored for a sustainable re-valorization of these residues.

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Section: Hydrogen and Methane Productionmentioning

confidence: 99%

Section: Hydrogen and Methane Productionmentioning

confidence: 99%

Section: Chemical Pretreatmentsmentioning

confidence: 99%

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Agave By-Products: An Overview of Their Nutraceutical Value, Current Applications, and Processing Methods

et al. 2021

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“…In Mexico, great interest is devoted to agave bagasse as one of the lignocellulosic biomasses whose revalorization needs to be addressed for reducing the environmental impacts of the mezcal and tequila industries 8,9 . The hydrolysates obtained from the pretreatment methods applied to agave bagasse are suitable for producing methane (CH 4 ) by anaerobic digestion 10 . However, after pretreatment, a significant challenge for exploiting the bagasse energy potential to produce CH 4 is related to the digester operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Transient shifts in hydraulic retention times improve the methane production from ruminal hydrolysates of agave bagasse

Vital‐Jácome

Barragán-Trinidad

Buitrón

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Valorization of lignocellulosic wastes such as agave bagasse from tequila industries can be enhanced using efficient biomass pretreatments. However, the next challenge requires finding the best process conditions to produce methane and remove chemical oxygen demand (COD) from the pretreatment hydrolysates. In this work, an innovative feeding strategy based on alternating hydraulic retention times (HRT) was investigated to improve methane production from ruminal hydrolysates of Agave tequilana bagasse. RESULTS The ruminal hydrolysate provided a substrate rich in volatile fatty acids (VFA) for direct use in the methanogenic process. The alternating feeding strategy increased the volumetric methane production rate by up to 25% (from 0.76 ± 0.05 to 0.95 ± 0.03 L CH4 L−1 d−1) compared to operating at a constant feeding rate, equivalent HRT of 15 h, and organic loading rate (OLR) of 8 g COD L−1 d−1. The alternating HRT operation improved VFA conversion without modifying the methane yield, and the COD removal was increased by 14%. The system stability, measured through the alkalinity index, was maintained during the proposed feeding strategy and after the increase in OLR. CONCLUSION The proposed feeding strategy is a promising tool for improving methane production from agave bagasse hydrolysates. The strategy was robust and easy to apply, which could expand its use for a wider variety of substrates. © 2021 Society of Chemical Industry (SCI).

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“…Alternative drying methods have been considered for the use of Agave spp. biomass at a larger scale, such as drying under natural conditions (environment temperature and light) [ 47 ] and artificial conditions performing oven dehydration at 45 °C [ 18 ], 60 °C [ 47 ], and 105 °C [ 48 ].…”

Section: Introductionmentioning

confidence: 99%

Early Optimization Stages of Agave lechuguilla Bagasse Processing toward Biorefinement: Drying Procedure and Enzymatic Hydrolysis for Flavonoid Extraction

et al. 2021

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Agave lechuguilla agro-waste is a promising renewable material for biorefining purposes. The procurement of added-value co-products, such as bioactive phytochemicals, is required to improve bioprocesses and promote the bio-based economy of the productive areas of Mexico. In this study, we aimed to evaluate the effect of post-harvest management and enzymatic pretreatment as the first stages of the A. lechuguilla valorization process. Four drying methods were compared, and enzymatic hydrolysis was optimized to obtain a flavonoid-enriched extract applying ultrasound-assisted extraction. In both experiments, the total phenolic (TPC) and flavonoid (TFC) contents, HPLC-UV flavonoid profiles, and radical scavenging capacity (DPPH) were considered as response variables. The results demonstrated that light exposure during the drying process particularly affected the flavonoid content, whereas oven-dehydration at 40 °C in the dark preserved the flavonoid diversity and antioxidant functionality of the extracts. Flavonoid glycoside recovery, particularly anthocyanidins, was 1.5–1.4-fold enhanced by enzymatic hydrolysis using the commercial mix Ultraflo© under optimized conditions (pH 4, 40 °C, 180 rpm, and 2.5 h) compared to the unpretreated biomass. The extraction of flavonoids from A. lechuguilla bagasse can be carried out using a scalable drying method and enzymatic pretreatment. This study confirmed the potential of this agro-waste as a source of marketable natural products.

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A comparison of biological, enzymatic, chemical and hydrothermal pretreatments for producing biomethane from Agave bagasse

Cited by 33 publications

References 49 publications

Agave By-Products: An Overview of Their Nutraceutical Value, Current Applications, and Processing Methods

Agave By-Products: An Overview of Their Nutraceutical Value, Current Applications, and Processing Methods

Transient shifts in hydraulic retention times improve the methane production from ruminal hydrolysates of agave bagasse

Early Optimization Stages of Agave lechuguilla Bagasse Processing toward Biorefinement: Drying Procedure and Enzymatic Hydrolysis for Flavonoid Extraction

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