Macroalgal biomass in terms of third-generation biorefinery concept: Current status and techno-economic analysis – A review

González-Gloria, K.D.; Rodríguez-Jasso, Rosa M.; Shiva,; Aparicio, Elizabeth M.; González, Mónica L. Chávez; Kostas, Emily T.; Ruíz, Héctor A.

doi:10.1016/j.biteb.2021.100863

Cited by 24 publications

(16 citation statements)

References 103 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…While a few bacterial isolates have been recovered and sequenced from kyphosid guts (34), no previous study has enriched entire communities from these fishes to investigate their hydrolytic and fermentative capabilities. Hydrolysis of carbohydrates, proteins, and lipids into their monomeric components is a key step in biogas and bioethanol production from macroalgae (35,36), and the degradation of algal polysaccharides is often the rate limiting step in anaerobic digestion (37). Milledge et al (2019) call for future studies to look beyond commercially available enzymes to discover candidates that can more efficiently degrade algal polysaccharides (38).…”

Section: Innovations Exploiting the Experimental Propagation Of Enric...mentioning

confidence: 99%

Enrichable consortia of microbial symbionts degrade macroalgal polysaccharides inKyphosusfish

Oliver,

Podell,

Kelly

et al. 2023

Preprint

View full text Add to dashboard Cite

Coastal herbivorous fishes consume macroalgae, which is then degraded by microbes along their digestive tract. However, there is scarce foundational genomic work on the microbiota that perform this degradation. This study explores the potential ofKyphosusgastrointestinal microbial symbionts to collaboratively degrade and ferment polysaccharides from red, green, and brown macroalgae throughin silicostudy of carbohydrate-active enzyme and sulfatase sequences. Recovery of metagenome-assembled genomes (MAGs) reveals differences in enzymatic capabilities between the major microbial taxa inKyphosusguts. The most versatile of the recovered MAGs were from the Bacteroidota phylum, whose MAGs house enzymes able to decompose a variety of algal polysaccharides. Unique enzymes and predicted degradative capacities of genomes from theBacillota(genusVallitalea) andVerrucomicrobiota(order Kiritimatiellales) suggest the potential for microbial transfer between marine sediment andKyphosusdigestive tracts. Few genomes contain the required enzymes to fully degrade any complex sulfated algal polysaccharide alone. The distribution of suitable enzymes between MAGs originating from different taxa, along with the widespread detection of signal peptides in candidate enzymes, is consistent with cooperative extracellular degradation of these carbohydrates. This study leverages genomic evidence to reveal an untapped diversity at the enzyme and strain level amongKyphosussymbionts and their contributions to macroalgae decomposition. Bioreactor enrichments provide a genomic foundation for degradative and fermentative processes central to translating the knowledge gained from this system to the aquaculture and bioenergy sectors.ImportanceSeaweed has long been considered a promising source of sustainable biomass for bioenergy and aquaculture feed, but scalable industrial methods for decomposing terrestrial compounds can struggle to break down seaweed polysaccharides efficiently due to their unique sulfated structures. Fish of the genusKyphosusfeed on seaweed by leveraging gastrointestinal bacteria to degrade algal polysaccharides into simple sugars. This study is the first to build genomes for these gastrointestinal bacteria to enhance our understanding of herbivorous fish digestion and fermentation of algal sugars. Investigations at the gene level identifyKyphosusguts as an untapped source of seaweed-degrading enzymes ripe for further characterization. These discoveries set the stage for future work incorporating marine enzymes and microbial communities in the industrial degradation of algal polysaccharides.

show abstract

Section: Innovations Exploiting the Experimental Propagation Of Enric...mentioning

confidence: 99%

Enrichable consortia of microbial symbionts degrade macroalgal polysaccharides inKyphosusfish

Oliver,

Podell,

Kelly

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The widespread use of seaweed as biomass for biogas production is still in the infancy stage. At the industrial level, only a handful of nations, including South Korea, Taiwan, and Brazil, have begun to develop seaweed bioenergy projects (González-Gloria et al 2021 ). Biogas production from seaweed is unstable, with several variations between species and seasons; in addition, the presence of inhibitory compounds and the recalcitrant characteristics of seaweed necessitate pretreatments for the large-scale application of biogas systems.…”

Section: Seaweed As a Feedstock For The Anaerobic Digestion Processmentioning

confidence: 99%

“…However, when the authors estimated the cost of seaweed pretreatment, they could not identify a net profit due to the higher price of enzymatic and chemical additives. Consequently, the macroalgae-based biofuels industry must optimise and develop more research and technologies to reduce costs and equipment (González-Gloria et al 2021 ).…”

Section: Seaweed As a Feedstock For The Anaerobic Digestion Processmentioning

confidence: 99%

Seaweed for climate mitigation, wastewater treatment, bioenergy, bioplastic, biochar, food, pharmaceuticals, and cosmetics: a review

et al. 2022

View full text Add to dashboard Cite

The development and recycling of biomass production can partly solve issues of energy, climate change, population growth, food and feed shortages, and environmental pollution. For instance, the use of seaweeds as feedstocks can reduce our reliance on fossil fuel resources, ensure the synthesis of cost-effective and eco-friendly products and biofuels, and develop sustainable biorefinery processes. Nonetheless, seaweeds use in several biorefineries is still in the infancy stage compared to terrestrial plants-based lignocellulosic biomass. Therefore, here we review seaweed biorefineries with focus on seaweed production, economical benefits, and seaweed use as feedstock for anaerobic digestion, biochar, bioplastics, crop health, food, livestock feed, pharmaceuticals and cosmetics. Globally, seaweeds could sequester between 61 and 268 megatonnes of carbon per year, with an average of 173 megatonnes. Nearly 90% of carbon is sequestered by exporting biomass to deep water, while the remaining 10% is buried in coastal sediments. 500 gigatonnes of seaweeds could replace nearly 40% of the current soy protein production. Seaweeds contain valuable bioactive molecules that could be applied as antimicrobial, antioxidant, antiviral, antifungal, anticancer, contraceptive, anti-inflammatory, anti-coagulants, and in other cosmetics and skincare products.

show abstract

“…In Africa's Atlantic coast, where Ulva lactuca and Codium tomentosum cause an environmental problem, these macroalgae showed excellent biogas yield compared to cow manure and Jatropha curcas cake [7]. Further understanding on biogas production from macroalgae has been explored in various studies for the last decades, extending from the pretreatment options [8], the effect of process condition [9,10], type of reactors [11], biorefinery approach [12], co-digestion strategy [13], to the techno-economy feasibilities [14]. One of the most recent research is exploring feedstock source that is not only fresh macroalgae but also the wastes to obtain biogas [15].…”

Section: Introductionmentioning

confidence: 99%

The Potential of Sustainable Biogas Production from Macroalgae in Indonesia

Farobie

Syaftika

Hartulistiyoso

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

Indonesia is the second world’s major macroalgae producer after China, contributing to 28% of the global macroalgae production. Indonesia increased its macroalgae farming output from less than 4 million tons in 2010 to over 9.9 million tons in 2019. It is expected to continue rising to 13 million tons by 2024. The contribution of macroalgal products is quite significant, 60.7% of the total national aquaculture production. To achieve sustainable energy development goals in many developing countries, including Indonesia, biomass to energy technology such as the production of biogas form macroalgae has been considered one of the best options. Therefore, we aim to investigate the potential application of biomass to energy technology via the production of biogas from macroalgae as an alternative source of local power generation. Indonesia’s energy mix and several issues regarding macroalgae production are comprehensively reviewed. Additionally, we also discussed the process of macroalgal biogas production.

show abstract

Macroalgal biomass in terms of third-generation biorefinery concept: Current status and techno-economic analysis – A review

Cited by 24 publications

References 103 publications

Enrichable consortia of microbial symbionts degrade macroalgal polysaccharides inKyphosusfish

Enrichable consortia of microbial symbionts degrade macroalgal polysaccharides inKyphosusfish

Seaweed for climate mitigation, wastewater treatment, bioenergy, bioplastic, biochar, food, pharmaceuticals, and cosmetics: a review

The Potential of Sustainable Biogas Production from Macroalgae in Indonesia

Contact Info

Product

Resources

About