Bio-hythane production from microalgae biomass: Key challenges and potential opportunities for algal bio-refineries

Ghimire, Anish; Kumar, Gopalakrishnan; Sivagurunathan, Periyasamy; Shobana, Sutha; Saratale, Ganesh Dattatraya; Kim, Hyun-Woo; Luongo, Vincenzo; Esposito, Giovanni; Muñoz, Raúl

doi:10.1016/j.biortech.2017.05.156

Cited by 101 publications

(33 citation statements)

References 89 publications

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“…Microalgal biomass can be efficiently used for the production of biogas, including methane, hydrogen, and biohythane (combination of methane and 5-25% hydrogen gas) (Ghimire et al, 2017). The resistance of cell wall to enzyme hydrolysis is one of the prime bottleneck in the Anaerobic digestion (AD) process.…”

Section: Biogasmentioning

confidence: 99%

Overview of Carbon Capture Technology: Microalgal Biorefinery Concept and State-of-the-Art

2019

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The impending danger of climate change and pollution can now be seen on the world panorama. The concentration of CO 2 , the most important Green House Gas (GHG), has reached to formidable levels. Although carbon capture and storage (CCS) methods have been largely worked upon, they are cumbersome in terms of economy and their long term environmental safety raises a concern. Alternatively, bio-sequestration of CO 2 using microalgal cell factories has emerged as a promising way of recycling CO 2 into biomass via photosynthesis which in turn could be used for the production of bioenergy and other value-added products. Despite enormous potential, the production of microalgae for low-value bulk products and bulk products such as biofuels, is heretofore, not feasible. To achieve economic viability and sustainability, major hurdles in both, the upstream and downstream processes have to be overcome. Recent technoeconomic analyses and life-cycle assessments of microalgae-based production systems have suggested that the only possible way for scaling up the production is to completely use the biomass in an integrated biorefinery setup wherein every valuable component is extracted, processed and valorized. This article provides a brief yet comprehensive review of the present carbon sequestration and utilization technologies, focusing primarily on biological CO 2 capture by microalgae in the context of bio-refinery. The paper discusses various products of microalgal biorefinery and aims to assess the opportunities, challenges and current state-of-the-art of microalgae-based CO 2 bioconversion, which are essential to the sustainability of this approach in terms of the environment as well as the economy.

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Section: Biogasmentioning

confidence: 99%

Overview of Carbon Capture Technology: Microalgal Biorefinery Concept and State-of-the-Art

2019

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“…In cyanobacteria, ethanol is produced under aerobic photosynthetic conditions in strains, in which pyruvate decarboxylase and aldehyde dehydrogenase genes are introduced (Deng and Coleman, 1999). Bio-hythane (mixture of H 2 and CH 4 produced from biological resources via biological processes) is also produced from microalgal bio-mass (e.g., Chlorella and Microcystis) via a two-stage fermentation (H 2 and CO synthesis during dark fermentation and then CH and CO 2 production during anaerobic digestion) (Ghimire et al, 2017).…”

Section: Biotechnology For Bioenergy Production By Photosynthesismentioning

confidence: 99%

Energy conservation in photosynthetic microorganisms

Okada

Fujiwara

Tsuzuki

2020

J. Gen. Appl. Microbiol.

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Photosynthesis is a biological process of energy conversion from solar radiation to useful organic compounds for the photosynthetic organisms themselves. It, thereby, also plays a role of food production for almost all animals on the Earth. The utilization of photosynthesis as an artificial carbon cycle is also attracting a lot of attention regarding its benefits for human life. Hydrogen and biofuels, obtained from photosynthetic microorganisms, such as microalgae and cyanobacteria, will be promising products as energy and material resources. Considering that the efficiency of bioenergy production is insufficient to replace fossil fuels at present, techniques for the industrial utilization of photosynthesis processes need to be developed intensively. Increase in the efficiency of photosynthesis, the yields of target substances, and the growth rates of algae and cyanobacteria must be subjects for efficient industrialization. Here, we overview the whole aspect of the energy production from photosynthesis to biomass production of various photosynthetic microorganisms.

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“…Microalgae are one of the important unicellular or multicellular organisms having a vital role on the Earth. They grow in freshwater and marine water, and they are able to fix dissolved inorganic carbon and CO 2 to synthesize chemical energy via phytosynthesis and heterotrophic metabolisms . Apart from its importance for Earth's cycle, microalgae biomass are used for mankinds in various areas such bioenergy production, CO 2 capturing, extraction of valuable products, and providing solutions to environmental problems.…”

Section: Introductionmentioning

confidence: 99%

“…They grow in freshwater and marine water, and they are able to fix dissolved inorganic carbon and CO 2 to synthesize chemical energy via phytosynthesis and heterotrophic metabolisms. 1 Apart from its importance for Earth's cycle, microalgae biomass are used for mankinds in various areas such bioenergy production, CO 2 capturing, extraction of valuable products, and providing solutions to environmental problems. Valuable products extracted from microalgae are being used in several purposes such as human nutrition, animal feed, aquaculture, and bio fertilizer.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review on pretreatment of microalgae for biogas production

Çakmak

Uğurlu

2018

Int J Energy Res

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Summary Use of microalgal biomass for renewable energy production has gained considerable attention in the world due to increasing global energy demand and negative environmental impacts of nonrenewable fossil fuels. Anaerobic digestion is one of the renewable technologies that microalgal biomass is converted into biogas by anaerobic archea. One of the main drawbacks of using microalgal biomass for biogas production is that certain types of microalgae has rigid cell wall characteristics, which limits accessibility of anaerobic archea to microalgal intracellular organic matter during hydrolysis phase. This limitation lowers efficiency of biogas production from microalgal biomass. However, introducing pretreatment methods prior to anaerobic digestion provides disruption of rigid microalgal cell wall and improve biogas yields from microalgal biomass. The objective of this paper was to review current knowledge related to pretreatment methods applied prior to anaerobic digestion of microalgal biomass. Efficiency and applicability of pretreatment methods mainly depend on type of microalgae, cell wall characteristics, and cost and energy requirements during pretreatment process. In this review, various type of pretreatment methods applied to microalgal biomass was discussed in detail with background knowledge and literature studies in their potential on maximization of biogas yields and their cost effectiveness, which is important for large‐scale applications. In the view of current knowledge, it was concluded that each pretreatment method has a relative contribution to improvement in biogas production depending on the type of microalgae. However, energy and cost requirements are the main limitations for pretreatment. So, further studies should focus on reduction of cost and energy demand by introducing combined methods, novel chemicals, and on‐site or immobilized enzymes in pretreatment to increase feasibility of pretreatment prior to anaerobic digestion in industrial scale.

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Bio-hythane production from microalgae biomass: Key challenges and potential opportunities for algal bio-refineries

Cited by 101 publications

References 89 publications

Overview of Carbon Capture Technology: Microalgal Biorefinery Concept and State-of-the-Art

Overview of Carbon Capture Technology: Microalgal Biorefinery Concept and State-of-the-Art

Energy conservation in photosynthetic microorganisms

A comprehensive review on pretreatment of microalgae for biogas production

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