Bioprospecting of Microbes for Biohydrogen Production: Current Status and Future Challenges

Kumar, Sunil; Sharma, Sushma; Thakur, Sapna; Mishra, Tanuja; Negi, Puneet; Mishra, Shaunak; Hesham, Abd El‐Latif; Yadav, Neelam; Yadav, Ajar Nath

doi:10.1002/9781119434436.ch22

Cited by 34 publications

(8 citation statements)

References 154 publications

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“…This process also simultaneously releases oxygen into the atmosphere (Jiménez-Llanos et al, 2020). The reaction for this process is as follows (Kumar S et al, 2019):…”

Section: Direct Biophotolysismentioning

confidence: 99%

“…One of the major disadvantages of this pathway is the inhabitation of hydrogen production due to the accumulation of oxygen as mentioned in Table 1. Other drawbacks include the risk of using oxygen, the requirement for high light intensity, and having low photochemical efficiency (Kumar S et al, 2019). Massive cultivation of algae is required to capture enough sunlight to provide sufficient free energy (ΔG +237 kJ mol −1 ).…”

Section: Direct Biophotolysismentioning

confidence: 99%

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Biohydrogen Production From Biomass Sources: Metabolic Pathways and Economic Analysis

et al. 2021

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The commercialization of hydrogen as a fuel faces severe technological, economic, and environmental challenges. As a method to overcome these challenges, microalgal biohydrogen production has become the subject of growing research interest. Microalgal biohydrogen can be produced through different metabolic routes, the economic considerations of which are largely missing from recent reviews. Thus, this review briefly explains the techniques and economics associated with enhancing microalgae-based biohydrogen production. The cost of producing biohydrogen has been estimated to be between $10 GJ-1 and $20 GJ−1, which is not competitive with gasoline ($0.33 GJ−1). Even though direct biophotolysis has a sunlight conversion efficiency of over 80%, its productivity is sensitive to oxygen and sunlight availability. While the electrochemical processes produce the highest biohydrogen (>90%), fermentation and photobiological processes are more environmentally sustainable. Studies have revealed that the cost of producing biohydrogen is quite high, ranging between $2.13 kg−1 and 7.24 kg−1via direct biophotolysis, $1.42kg−1 through indirect biophotolysis, and between $7.54 kg−1 and 7.61 kg−1via fermentation. Therefore, low-cost hydrogen production technologies need to be developed to ensure long-term sustainability which requires the optimization of critical experimental parameters, microalgal metabolic engineering, and genetic modification.

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“…This process also simultaneously releases oxygen into the atmosphere (Jiménez-Llanos et al, 2020). The reaction for this process is as follows (Kumar S et al, 2019):…”

Section: Direct Biophotolysismentioning

confidence: 99%

Section: Direct Biophotolysismentioning

confidence: 99%

Biohydrogen Production From Biomass Sources: Metabolic Pathways and Economic Analysis

et al. 2021

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“…A biorefinery has numerous advantages over the conventional petrochemical refinery such as being environmental-friendly and utilising biomass feedstock, i.e. it utilises waste biomass (especially kitchen waste) (Cherubini 2010;Kaur et al 2020;Kumar et al 2019;. The final products of a biorefinery are much demanded since it has renewable feedstock of plant-based biomass.…”

Section: Biorefinery: the Microbial Machineriesmentioning

confidence: 99%

Fungal Biorefineries for Biofuel Production for Sustainable Future Energy Systems

2021

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“…The disadvantage of this convenient method is that the biomass and product yields are limited. Since the carbon source and/or oxygen transfer are usually the limiting factor, the microorganisms are not in the exponential growth phase for a long time [33,34].…”

Section: Batch Fermentationmentioning

confidence: 99%

A Review on Microbial Enzymes, Synthesis, Biological Role, Current Applications and Future Perspectives

Naureen¹,

Bashir²,

Ahmed³

et al. 2021

Scholars Bulletin

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Increased uses of microbial enzymes in cheese processing are largely responsible for the use of enzymes in dairy industry, which is the next largest application industry followed by the beverages industry. Microbial enzymes such as fructosyltransferase, laccases, amylases, lipase, and cholesterol oxidase, as well as their potential applications in various industries. GUS in the form of β-glucuronidases acting as main gut enzyme have been sued in the pharmaceutical and clinical trials for testing the drugs toxicity prior their use in the human body. Amylase is the most important microbial enzyme that involved in the digestion of starch into small molecules of sugars. Amylase obtained from microorganisms usually less expensive and catalyzed the breakdown of starch in effective ways while the amylase obtained form plants as well as other animals required lots of chemicals and other microbial process for their separation, purification as well as their characterization. Submerged fermentation is the cultivation of microorganisms in liquid nutrient broth. Industrial enzymes can be produced using this process. In a batch process, all nutrients are provided at the beginning of the cultivation, without adding any more in the subsequent bioprocess.

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Bioprospecting of Microbes for Biohydrogen Production: Current Status and Future Challenges

Cited by 34 publications

References 154 publications

Biohydrogen Production From Biomass Sources: Metabolic Pathways and Economic Analysis

Biohydrogen Production From Biomass Sources: Metabolic Pathways and Economic Analysis

Fungal Biorefineries for Biofuel Production for Sustainable Future Energy Systems

A Review on Microbial Enzymes, Synthesis, Biological Role, Current Applications and Future Perspectives

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