Sugars Production from Municipal Forestry and Greening Wastes Pretreated by an Integrated Steam Explosion-Based Process

Negro, M.J.; Alvarez, Cristina Engel de; Doménech, Pablo; Iglesias, Raquel; Ballesteros, Ignacio

doi:10.3390/en13174432

Cited by 17 publications

(10 citation statements)

References 31 publications

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“…The SE pretreatment was carried out using a prototype unit located at CIEMAT. This SE unit operates in batch mode and consists of a steam generator, a 10 L capacity reactor and a discharging cyclone [21]. The generator supplies saturated steam to the interior of the reactor, where the biomass is subjected to controlled temperature, pressure and time conditions.…”

Section: Raw Materials and Pretreatmentmentioning

confidence: 99%

In Vitro Assessment of the Prebiotic Potential of Xylooligosaccharides from Barley Straw

Alvarez

González

Ballesteros

et al. 2022

Foods

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Barley straw was subjected to hydrothermal pretreatment (steam explosion) processing to evaluate its potential as a raw material to produce xylooligosaccharides (XOS) suitable for use as a prebiotic. The steam explosion pretreatment generated a liquid fraction containing solubilised hemicellulose. This fraction was purified using gel permeation chromatography to obtain a fraction rich in XOS DP2-DP6. The sample was characterised through analytical techniques such as HPAEC-PAD, FTIR and MALDI-TOF-MS. The prebiotic activity was evaluated using in vitro fermentation in human faecal cultures through the quantification of short-chain fatty acid (SCFA) and lactate production, the evolution of the pH and the consumption of carbon sources. The total SCFA production at the end of fermentation (30 h) was 90.1 mM. Positive significant differences between the amount of XOS from barley straw and fructooligosaccharides after incubation were observed.

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Section: Raw Materials and Pretreatmentmentioning

confidence: 99%

In Vitro Assessment of the Prebiotic Potential of Xylooligosaccharides from Barley Straw

Alvarez

González

Ballesteros

et al. 2022

Foods

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“…Then, the solid fraction undergoes an enzymatic hydrolysis (EH) process at 20% (w/w) solid loading, producing a sugar-rich media stream. This process is carried out at 50 • C with 150 mg/g of glucans of cellulase enzyme blend (Sigma Aldrich, Saint Louis, MI, USA) for 72 h, reaching an EH yield of 65.0% of the theoretical [16,17]. After HE, the resulting stream is filtered to remove the residual insoluble solids and mixed with the DPW-LF stream.…”

Section: Techno-economic Assessment 241 Process Descriptionmentioning

confidence: 99%

Evaluation and Identification of Key Economic Bottlenecks for Cost-Effective Microbial Oil Production from Fruit and Vegetable Residues

et al. 2022

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Intensive horticultural systems for the production of vegetables in greenhouses represent one of the main industries generating organic waste, as those that do not meet the quality standards for the fresh market or the processing industry are discarded. This highlights the importance of using these residues as raw material for other applications, such as bioenergy and bioproducts production, within the framework of a bio-based economy that maximizes the utilization of biomass resources in a sustainable manner. In this work, the microbial oil production from discarded pepper using the oleaginous yeast Cryptococcus curvatus was evaluated. Overall, a total lipid accumulation of 16.8 g/L was achieved with a fatty acid profile suitable to produce biodiesel. The lipid yield obtained was 0.12 g/g sugars. In addition, experimental results were used to assess the techno-economic feasibility of a proposed microbial oil plant using the software Aspen Plus. This plant yields approximately 96 kg of microbial oils/ton dry discarded pepper, with an estimated Minimum Selling Price of 7 €·kg−1. These figures point out the necessity of increasing the yield of microbial oil production and considering the utilization of possible by-products, such as mannitol and cell debris, to improve the economic performance of the process.

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“…Finally, sugars are fermented into ethanol (Anyanwu et al, 2018). Pretreatment is an instrumental stage of the process, and hence, its type and conditions play important roles in the overall technical viability of the whole process (Negro et al, 2020;Morales et al, 2021). The various pretreatment methods include chemical, physical, physicochemical, and biological (Sharma et al, 2020).…”

Section: Conversion Of Forest Biomass Into Liquid Biofuelsmentioning

confidence: 99%

An Overview on the Conversion of Forest Biomass into Bioenergy

Qian

Wang

et al. 2021

Front. Energy Res.

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Biomass plays a crucial role in mitigating the concerns associated with increasing fossil fuel combustion. Among various types of biomass, forest biomass has attracted considerable attention given its abundance and variations. In this work, an overview is presented on different pathways available to convert forest biomass into bioenergy. Direct use of forest biomass could reduce carbon dioxide emissions associated with conventional energy production systems. However, there are certain drawbacks to the direct use of forest biomass, such as low energy conversion rate and soot emissions and residues. Also, lack of continuous access to biomass is a severe concern in the long-term sustainability of direct electricity generation by forest biomass. To solve this problem, co-combustion with coal, as well as pelletizing of biomass, are recommended. The co-combustion of forest biomass and coal could reduce carbon monoxide, nitrogen oxides, and sulfide emissions of the process. Forest biomass can also be converted into various liquid and gaseous biofuels through biochemical and thermochemical processes, which are reviewed and discussed herein. Despite the favorable features of forest biomass conversion processes to bioenergy, their long-term sustainability should be more extensively scrutinized by future studies using advanced sustainability assessment tools such as life cycle assessment, exergy, etc.

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Sugars Production from Municipal Forestry and Greening Wastes Pretreated by an Integrated Steam Explosion-Based Process

Cited by 17 publications

References 31 publications

In Vitro Assessment of the Prebiotic Potential of Xylooligosaccharides from Barley Straw

In Vitro Assessment of the Prebiotic Potential of Xylooligosaccharides from Barley Straw

Evaluation and Identification of Key Economic Bottlenecks for Cost-Effective Microbial Oil Production from Fruit and Vegetable Residues

An Overview on the Conversion of Forest Biomass into Bioenergy

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