Pretreatment of macroalgal biomass for biogas production

Montingelli, Maria; Benyounis, K.Y.; Stokes, Joseph; Olabi, Abdul–Ghani

doi:10.1016/j.enconman.2015.11.008

Cited by 108 publications

(52 citation statements)

References 44 publications

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“…The following formulas, as reported in [30], were employed in order to calculate the energy balance related to the use of the mechanical pretreatment.…”

Section: Energy Balance Calculation Methodsmentioning

confidence: 99%

“…A batch system, as reported in [30], was used as the AD experiment set-up. The bioreactors consisted of borosilicate glass flasks of 500 ml in capacity.…”

Section: Anaerobic Biodegradabilitymentioning

confidence: 99%

“…The beating pretreatment for seaweed biomass was investigated by Tedesco et al [29] who showed an enhancement in biogas and methane yields of 52% and 53% respectively from Laminaria sp. While, considering different mechanical pretreatments, Montingelli et al [30] showed that beating pretreatment on Laminaria sp. was able to promote the start of the AD and reduce the incubation time while microwave and ball milling pretreatment had a negative effect on methane yields.…”

Section: Introductionmentioning

confidence: 99%

“…[29,30], this experimental study evaluated the impact of beating pretreatment and substrate concentration on AD of the brown seaweed Laminaria sp., at different harvesting times, in Ireland. The pretreatment phase was tested in terms of beating time, while the substrate concentration was considered in terms of VS concentration.…”

Section: Introductionmentioning

confidence: 99%

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Optimisation of biogas production from the macroalgae Laminaria sp. at different periods of harvesting in Ireland

et al. 2016

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h i g h l i g h t sAutumn was the best harvesting period of Laminaria sp. as feedstock for AD, in Ireland. During spring, the system was improved by applying the pretreatment and at a VS concentration of 2.5%. Higher methane yields were observed at short pretreatment times and at VS concentration below 2.5%. A positive energy balance was estimated in autumn and early spring. a b s t r a c tBrown seaweeds are a suitable substrate for biogas production through anaerobic digestion (AD). Since the carbohydrates' content is subjected to a seasonal variation, this research aimed to select the best harvesting period of beach cast brown seaweed Laminaria sp. for methane production, while optimising the use of a beating pretreatment and the organic substrate concentration. Response surface methodology (RSM) was used to estimate the effect of the beating pretreatment in terms of pretreatment time (5-10-15 min) and organic matter concentration in terms of volatile solids (VS) (1-2.5-4%) on methane production. The highest methane yield of 342 ± 17 ml g À1 VS was observed during November at 1% of VS and after 5 min of pretreatment, while the lowest yields were registered in March with an average of 163 ± 28 ml g À1 VS. However, an enhancement of 47% with respect to the untreated sample was achieved at 2.5% of VS and after 15 min of pretreatment, in March.

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“…The following formulas, as reported in [30], were employed in order to calculate the energy balance related to the use of the mechanical pretreatment.…”

Section: Energy Balance Calculation Methodsmentioning

confidence: 99%

“…A batch system, as reported in [30], was used as the AD experiment set-up. The bioreactors consisted of borosilicate glass flasks of 500 ml in capacity.…”

Section: Anaerobic Biodegradabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimisation of biogas production from the macroalgae Laminaria sp. at different periods of harvesting in Ireland

et al. 2016

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“…Alternatively, hydrolytic activity can be increased by carrying out the anaerobic digestion under thermophilic conditions since thermophilic microbial populations exhibits higher enzymatic activity [11], although the thermophilic process is more prone to instability than the mesophilic one due to inhibition by free ammonia [12], especially when substrates with high protein content such as 4 microalgae are digested [13].…”

Section: Introductionmentioning

confidence: 99%

Microbial community characterization during anaerobic digestion of Scenedesmus spp. under mesophilic and thermophilic conditions

et al. 2017

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ElsevierGreses-Huerta, S.; Gaby, JC.; Aguado García, D.;Ferrer, J.; Seco Torrecillas, A.; Horn, SJ. (2017). Microbial community characterization during anaerobic digestion of Scenedesmus spp. under mesophilic and thermophilic conditions. AbstractMicrobial communities were thoroughly characterized in a mesophilic anaerobic membrane bioreactor (AnMBR) and a thermophilic continuous stirred tank reactor (CSTR), which were both treating recalcitrant microalgal biomass dominated by Scenedesmus. 16S rRNA amplicon sequencing analysis was performed when the AnMBR achieved 70% algal biodegradation and revealed high microbial diversity, probably due to the high solid retention time (SRT) of the AnMBR configuration. The bacterial community consisted of Chloroflexi (27.9%), WWE1 (19.0%) and Proteobacteria (15.4%) as the major phyla, followed by Spirochaetes (7.7%), Bacteroidetes 2 (5.9%) and Firmicutes (3.6%). These phyla are known to exhibit proteolytic and cellulolytic capabilities required to degrade the Scenedesmus cell-wall. Methanosaeta was the most abundant methanogen detected in the AnMBR suggesting that methane was mainly produced by the acetoclastic pathway. In comparison, the thermophilic CSTR achieved 32.6% algal biodegradation, and its bacterial community had fewer Operational Taxonomic Units (977 OTUs) than the AnMBR (1396 OTUs), as is generally observed for high temperature biogas reactors. However, phyla with high hydrolytic potential were detected such as Firmicutes (34.6%) and the candidate taxon EM3 (38.7%) in the thermophilic CSTR. Although the functional metabolism of EM3 in anaerobic digesters is unknown, the high abundance of EM3 suggests that this taxon plays an important role in the thermophilic, anaerobic degradation of Scenedesmus. The abundant syntrophic bacteria and the detection of hydrogenotrophic methanogens in the thermophilic CSTR suggest that the hydrogenotrophic pathway was the dominant pathway for methane production in this reactor.

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Optimization of wheat‐straw‐extracted cellulose via response surface methodology and mechanical properties of its poly(lactide)‐based biocomposites

2020

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In view of environmental footprints and growing demand for green energy materials, employing biomass by eliminating lignin and hemicellulose has been topic of recent interests due to their applications in food packaging, textile, automobile, and polymer industries. Herein, we report on optimization of the cellulose extraction (removal of lignin and hemicellulose) from agro-waste (wheat straw) by the response surface methodology (RSM), where, the Box Behnken Design has been implemented to study the effect of sodium hydroxide/sodium hypochlorite amount, temperature, and time on the extraction process. Fourier transform infrared spectroscopy, X-ray diffraction study, and thermal degradation analysis indicate the successful isolation of cellulose with maximum (56%) removal of hemicellulose and lignin under optimal conditions. Furthermore, nano-indenter analysis and tensile strength have been examined for cellulose/poly(lactide) biocomposites at different wt.% of cellulose, which indicated better tensile strength (28.15 MPa), tensile modulus (2430.24 MPa), and elongation at break (1.89%) as compared to intrinsic poly(lactide). Such studies on the cellulose extraction with optimized conditions and their mechanically stable biocomposites will pave the way for their utilization in polymer industrial applications.

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Pretreatment of macroalgal biomass for biogas production

Cited by 108 publications

References 44 publications

Optimisation of biogas production from the macroalgae Laminaria sp. at different periods of harvesting in Ireland

Optimisation of biogas production from the macroalgae Laminaria sp. at different periods of harvesting in Ireland

Microbial community characterization during anaerobic digestion of Scenedesmus spp. under mesophilic and thermophilic conditions

Optimization of wheat‐straw‐extracted cellulose via response surface methodology and mechanical properties of its poly(lactide)‐based biocomposites

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