Screening of native microalgae species for carbon fixation at the vicinity of Malaysian coal-fired power plant

Yahya, Liyana; Harun, Razif; Abdullah, Luqman Chuah

doi:10.1038/s41598-020-79316-9

Cited by 30 publications

(8 citation statements)

References 41 publications

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“…Disregarding the operation with the enriched community, the average carbon fixation rate was between 2.0 and 31.0 C mmol L −1 days −1 (0.088 and 1.4 g CO 2 equivalents L −1 days −1 , respectively), with the most favourable period observed in Reactor 1 at an HRT of 14 days without acetate supply (Figure 2B). These volumetric carbon fixation rates are comparable with rates observed in state-of-the-art microalgal reactors (Yahya et al, 2020). However, the carbon fixation reported here was due to CO consumption (Figure 2B).…”

Section: Effect Of Changing Operation Conditions On Process Performancesupporting

confidence: 88%

Mixotrophic chain elongation with syngas and lactate as electron donors

Baleeiro

Raab

Kleinsteuber

et al. 2022

Microbial Biotechnology

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Feeding microbial communities with both organic and inorganic substrates can improve sustainability and feasibility of chain elongation processes. Sustainably produced H 2 , CO 2 , and CO can be co‐fed to microorganisms as a source for acetyl‐CoA, while a small amount of an ATP‐generating organic substrate helps overcome the kinetic hindrances associated with autotrophic carboxylate production. Here, we operated two semi‐continuous bioreactor systems with continuous recirculation of H 2 , CO 2 , and CO while co‐feeding an organic model feedstock (lactate and acetate) to understand how a mixotrophic community is shaped during carboxylate production. Contrary to the assumption that H 2 , CO 2 , and CO support chain elongation via ethanol production in open cultures, significant correlations ( p < 0.01) indicated that relatives of Clostridium luticellarii and Eubacterium aggregans produced carboxylates (acetate to n ‐caproate) while consuming H 2 , CO 2 , CO, and lactate themselves. After 100 days, the enriched community was dominated by these two bacteria coexisting in cyclic dynamics shaped by the CO partial pressure. Homoacetogenesis was strongest when the acetate concentration was low (3.2 g L −1 ), while heterotrophs had the following roles: Pseudoramibacter , Oscillibacter , and Colidextribacter contributed to n ‐caproate production and Clostridium tyrobutyricum and Acidipropionibacterium spp. grew opportunistically producing n ‐butyrate and propionate, respectively. The mixotrophic chain elongation community was more efficient in carboxylate production compared with the heterotrophic one and maintained average carbon fixation rates between 0.088 and 1.4 g CO 2 equivalents L −1 days −1 . The extra H 2 and CO consumed routed 82% more electrons to carboxylates and 50% more electrons to carboxylates longer than acetate. This study shows for the first time long‐term, stable production of short‐ and medium‐chain carboxylates with a mixotrophic community.

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Section: Effect Of Changing Operation Conditions On Process Performancesupporting

confidence: 88%

Mixotrophic chain elongation with syngas and lactate as electron donors

Baleeiro

Raab

Kleinsteuber

et al. 2022

Microbial Biotechnology

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“…However, considerable importance should be also attached to the upstream process, such as employing and optimizing native microalgae species to expedite the acclimatization period and alleviate the in situ biological CO 2 fixation. A significant effort toward this goal was recently made by Yahya et al [ 232 ], who screened native microalgae species in a coal-fired power plant’s surroundings for carbon fixation ability and identified three dominant species ( Nannochloropsis sp., Tetraselmis sp., and Isochrysis sp.). Among them, Isochrysis sp.…”

Section: Coal Microalgae Hold Great Biotechnological Potential In Coa...mentioning

confidence: 99%

Biotechnology of Microorganisms from Coal Environments: From Environmental Remediation to Energy Production

Akimbekov

Digel

Tastambek

et al. 2022

Biology

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It was generally believed that coal sources are not favorable as live-in habitats for microorganisms due to their recalcitrant chemical nature and negligible decomposition. However, accumulating evidence has revealed the presence of diverse microbial groups in coal environments and their significant metabolic role in coal biogeochemical dynamics and ecosystem functioning. The high oxygen content, organic fractions, and lignin-like structures of lower-rank coals may provide effective means for microbial attack, still representing a greatly unexplored frontier in microbiology. Coal degradation/conversion technology by native bacterial and fungal species has great potential in agricultural development, chemical industry production, and environmental rehabilitation. Furthermore, native microalgal species can offer a sustainable energy source and an excellent bioremediation strategy applicable to coal spill/seam waters. Additionally, the measures of the fate of the microbial community would serve as an indicator of restoration progress on post-coal-mining sites. This review puts forward a comprehensive vision of coal biodegradation and bioprocessing by microorganisms native to coal environments for determining their biotechnological potential and possible applications.

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“…Then, this energy loss will decrease the photosynthesis rate and affect the carbohydrate accumulation process in microalgae cells [39]. The capability of microalgae in response to the high CO 2 concentration is species-dependent [40].…”

Section: Effect Of the Interaction Between Ph And Co 2 Concentrationmentioning

confidence: 99%

Microalgal biorefinery: Challenge and strategy in bioprocessing of microalgae carbohydrate for fine chemicals and biofuel

Meng¹,

Harun²,

Kamaludin³

2021

J App Biol Biotech

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Microalgal carbohydrate is one of the major macromolecule metabolites, which has recently gained great attention as an alternative feedstock for wide-range sustainable biobased products. These biopolymers can act as a chemical platform for the production of biofuels through a biochemical conversion process. However, low microalgal carbohydrate productivity at a large-scale production has become a major problem for economical biofuel production. Several strategies have been proposed and the approach only increased carbohydrate content but reduced the microalgal biomass production, resulting in low microalgal carbohydrate productivity. Besides, the inappropriate pretreatments and fermentation approaches specifically with high-energy techniques could cause an increase in the cost of biofuel production. This present review gives a comprehensive discussion on microalgal carbohydrate enhancement strategies via cultivation techniques including the influence of environmental stress on the microalgal biomass and carbohydrate productivity. This paper also reviews the state of art on downstream processing of microalgal biomass prior to the hydrolysis and fermentation process. The different fine chemicals such as bioethanol, biobutanol, and biohydrogen production from microalgal carbohydrate are also discussed. The information from this review provides a framework for bioconversion of microalgal carbohydrate for biofuel and fine chemicals. This production could be beneficial for potential industrial implementation.

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Screening of native microalgae species for carbon fixation at the vicinity of Malaysian coal-fired power plant

Cited by 30 publications

References 41 publications

Mixotrophic chain elongation with syngas and lactate as electron donors

Mixotrophic chain elongation with syngas and lactate as electron donors

Biotechnology of Microorganisms from Coal Environments: From Environmental Remediation to Energy Production

Microalgal biorefinery: Challenge and strategy in bioprocessing of microalgae carbohydrate for fine chemicals and biofuel

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