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Godar AG, Chase T, Conway D, Ravichandran D, Woodson I, Lai YJ, Song K, Rittmann BE, Wang X, Nielsen DR. 'Dark' CO 2 fixation in succinate fermentations enabled by direct CO 2 delivery via hollow fiber membrane carbonation. Bioprocess Biosyst Eng 2024; 47:223-233. [PMID: 38142425 DOI: 10.1007/s00449-023-02957-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 11/26/2023] [Indexed: 12/26/2023]
Abstract
Anaerobic succinate fermentations can achieve high-titer, high-yield performance while fixing CO2 through the reductive branch of the tricarboxylic acid cycle. To provide the needed CO2, conventional media is supplemented with significant (up to 60 g/L) bicarbonate (HCO3-), and/or carbonate (CO32-) salts. However, producing these salts from CO2 and natural ores is thermodynamically unfavorable and, thus, energetically costly, which reduces the overall sustainability of the process. Here, a series of composite hollow fiber membranes (HFMs) were first fabricated, after which comprehensive CO2 mass transfer measurements were performed under cell-free conditions using a novel, constant-pH method. Lumen pressure and total HFM surface area were found to be linearly correlated with the flux and volumetric rate of CO2 delivery, respectively. Novel HFM bioreactors were then constructed and used to comprehensively investigate the effects of modulating the CO2 delivery rate on succinate fermentations by engineered Escherichia coli. Through appropriate tuning of the design and operating conditions, it was ultimately possible to produce up to 64.5 g/L succinate at a glucose yield of 0.68 g/g; performance approaching that of control fermentations with directly added HCO3-/CO32- salts and on par with prior studies. HFMs were further found to demonstrate a high potential for repeated reuse. Overall, HFM-based CO2 delivery represents a viable alternative to the addition of HCO3-/CO32- salts to succinate fermentations, and likely other 'dark' CO2-fixing fermentations.
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Affiliation(s)
- Amanda G Godar
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - Timothy Chase
- School for Engineering of Matter, Transport and Energy, Arizona State University, BDC C499C, Tempe, AZ, 85282, USA
| | - Dalton Conway
- School for Engineering of Matter, Transport and Energy, Arizona State University, BDC C499C, Tempe, AZ, 85282, USA
| | | | - Isaiah Woodson
- School for Engineering of Matter, Transport and Energy, Arizona State University, BDC C499C, Tempe, AZ, 85282, USA
| | - Yen-Jung Lai
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ, USA
| | - Kenan Song
- School of Manufacturing Systems and Networks, Arizona State University, Tempe, AZ, USA
| | - Bruce E Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ, USA
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, USA
| | - Xuan Wang
- School of Life Sciences, Arizona State University, Tempe, AZ, USA
| | - David R Nielsen
- School for Engineering of Matter, Transport and Energy, Arizona State University, BDC C499C, Tempe, AZ, 85282, USA.
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Miyauchi H, Ishikawa T, Hirakawa Y, Sudou A, Okada K, Hijikata A, Sato N, Tsuzuki M, Fujiwara S. Cellular response of Parachlorella kessleri to a solid surface culture environment. FRONTIERS IN PLANT SCIENCE 2023; 14:1175080. [PMID: 37342150 PMCID: PMC10277731 DOI: 10.3389/fpls.2023.1175080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 05/02/2023] [Indexed: 06/22/2023]
Abstract
Attached culture allows high biomass productivity and is a promising biomass cultivating system because neither a huge facility area nor a large volume of culture medium are needed. This study investigates photosynthetic and transcriptomic behaviors in Parachlorella kessleri cells on a solid surface after their transfer from liquid culture to elucidate the physiological and gene-expression regulatory mechanisms that underlie their vigorous proliferation. The chlorophyll content shows a decrease at 12 h after the transfer; however, it has fully recovered at 24 h, suggesting temporary decreases in the amounts of light harvesting complexes. On PAM analysis, it is demonstrated that the effective quantum yield of PSII decreases at 0 h right after the transfer, followed by its recovery in the next 24 h. A similar changing pattern is observed for the photochemical quenching, with the PSII maximum quantum yield remaining at an almost unaltered level. Non-photochemical quenching was increased at both 0 h and 12 h after the transfer. These observations suggest that electron transfer downstream of PSII but not PSII itself is only temporarily damaged in solid-surface cells just after the transfer, with light energy in excess being dissipated as heat for PSII protection. It thus seems that the photosynthetic machinery acclimates to high-light and/or dehydration stresses through its temporal size-down and functional regulation that start right after the transfer. Meanwhile, transcriptomic analysis by RNA-Seq demonstrates temporary upregulation at 12 h after the transfer as to the expression levels of many genes for photosynthesis, amino acid synthesis, general stress response, and ribosomal subunit proteins. These findings suggest that cells transferred to a solid surface become stressed immediately after transfer but can recover their high photosynthetic activity through adaptation of photosynthetic machinery and metabolic flow as well as induction of general stress response mechanisms within 24 h.
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Energy-efficient algal culture through aeration-less oxygen removal in a gas-permeable bag photobioreactor. ALGAL RES 2022. [DOI: 10.1016/j.algal.2022.102959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Kishi M, Tanaka K, Akizuki S, Toda T. Development of a gas-permeable bag photobioreactor for energy-efficient oxygen removal from algal culture. ALGAL RES 2021. [DOI: 10.1016/j.algal.2021.102543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Dogdu Okcu G, Eustance E, Lai YS, Rittmann BE. Evaluation of co-culturing a diatom and a coccolithophore using different silicate concentrations. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 769:145217. [PMID: 33493907 DOI: 10.1016/j.scitotenv.2021.145217] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 01/06/2021] [Accepted: 01/12/2021] [Indexed: 06/12/2023]
Abstract
Globally, the demand for sustainable energy production and high-value biological compounds have become intertwined in an attempt to improve the feasibility of sustainable algal cultivation. Marine microalgae, especially diatoms and coccolithophores, represent viable cultures that can produce biofuels and high-value compounds. Growing them in co-culture offers the potential to produce lipids and pigments, while also generating CaCO3 for C sequestration. The main objective of this work was to investigate competition or co-existence of the diatom Chaetoceros gracilis and the coccolithophore Pleurochrysis Carterae. The focus was on the effects of silicate and co-culturing on the growth rate, productivity, pigment production, and ash production for C. gracilis and P. carterae in laboratory conditions. The results showed that, in monoculture, 2-mM Si enhanced the specific growth rate of C. gracilis, but did not affect P. carterae. Regardless of silicate concentration, C. gracilis was more productive than P. carterae. In co-culture, P. carterae had a slower growth rate, indicating an inhibitory effect of C. gracilis on P. carterae. Neither silicate concentration nor co-culturing had an impact on the contents of pigments fucoxanthin, chlorophyll-a, and chlorophyll-c, which means that pigment productivity was proportional to biomass productivity. Finally, the ash content increased in all cultures with the lower silicate concentration (0.2 mM) in the medium. With one exception, the ash content was dominated by SiO2 regardless of silicate amount, and CaCO3 was a major part of the ash only when P. carterae was grown separately with the higher silicate level. These results highlight that co-culturing did not provide an advantage for improving biomass, pigments, or CaCO3 productivity.
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Affiliation(s)
- Gamze Dogdu Okcu
- Department of Environmental Engineering, Bolu Abant Izzet Baysal University, Golkoy Campus, Bolu 14030, Turkey
| | - Everett Eustance
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ 85287, USA.
| | - YenJung Sean Lai
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ 85287, USA
| | - Bruce E Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ 85287, USA
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