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Haider MN, O'Higgins L, O'Shea R, Archer L, Wall DM, Verma N, Rodero MDR, Mehmood MA, Murphy JD, Bose A. Selecting optimal algal strains for robust photosynthetic upgrading of biogas under temperate oceanic climates. Biotechnol Adv 2025; 82:108581. [PMID: 40258525 DOI: 10.1016/j.biotechadv.2025.108581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2024] [Revised: 03/20/2025] [Accepted: 04/14/2025] [Indexed: 04/23/2025]
Abstract
Biogas generated from anaerobic digestion can be upgraded to biomethane by photosynthetic biogas upgrading, using CO2 as a bioresource for algal (cyanobacteria and microalgae) cultivation. This allows the upgrading technology to offer economic and environmental benefits to conventional physiochemical upgrading techniques (which can be energy-intensive and costly) by co-generating biomethane with high-value biomass. However, a critical challenge in implementing this technology in temperate oceanic climatic conditions (as found in Japan, and the northwest coasts of Europe and of North America, with average temperatures ranging between 5 and 20 °C) is the selection of algal strains that must be capable of sustained growth under lower ambient temperatures. Accordingly, this paper investigated the selection of algae that met seven key criteria: optimal growth at high pH (9-11); at alkalinity of 1.5-2.5 g inorganic carbon per litre; operation at low temperature (5-20 °C); tolerance to high CO2 concentrations (above 20 %); capability for mixotrophic cultivation; ability to accumulate high-value metabolites such as photosynthetic pigments and bioactive fatty acids; and ease of harvesting. Of the twenty-six algal species assessed and ranked using a Pugh Matrix, Anabaena sp. and Phormidium sp. were assessed as the most favourable species, followed by Oscillatoria sp., Spirulina subsalsa, and Leptolyngbya sp. Adaptive laboratory evolution together with manipulation of abiotic factors could be effectively utilised to increase the efficiency and economic feasibility of the use of the selected strain in a photosynthetic biogas upgrading system, through improvement of growth and yield of high-value compounds.
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Affiliation(s)
- Muhammad Nabeel Haider
- MaREI Centre for energy, climate and marine, Environmental Research Institute, University College Cork, Cork T23 XE10, Ireland; School of Engineering and Architecture, University College Cork, Ireland
| | - Linda O'Higgins
- MaREI Centre for energy, climate and marine, Environmental Research Institute, University College Cork, Cork T23 XE10, Ireland
| | - Richard O'Shea
- MaREI Centre for energy, climate and marine, Environmental Research Institute, University College Cork, Cork T23 XE10, Ireland; School of Engineering and Architecture, University College Cork, Ireland
| | - Lorraine Archer
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
| | - David M Wall
- MaREI Centre for energy, climate and marine, Environmental Research Institute, University College Cork, Cork T23 XE10, Ireland; School of Engineering and Architecture, University College Cork, Ireland
| | - Nikita Verma
- MaREI Centre for energy, climate and marine, Environmental Research Institute, University College Cork, Cork T23 XE10, Ireland; School of Engineering and Architecture, University College Cork, Ireland
| | - María Del Rosario Rodero
- Institute of Sustainable Processes, University of Valladolid, Dr. Mergelina s/n., Valladolid 47011, Spain
| | - Muhammad Aamer Mehmood
- Bioenergy Research Center, Department of Bioinformatics and Biotechnology, Government College University Faisalabad, Faisalabad 38000, Pakistan
| | - Jerry D Murphy
- MaREI Centre for energy, climate and marine, Environmental Research Institute, University College Cork, Cork T23 XE10, Ireland; School of Engineering and Architecture, University College Cork, Ireland
| | - Archishman Bose
- MaREI Centre for energy, climate and marine, Environmental Research Institute, University College Cork, Cork T23 XE10, Ireland; School of Engineering and Architecture, University College Cork, Ireland.
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Bulut O, Köse IE, Sönmez Ç, Öktem HA. Antioxidant activity of Micractinium sp. (Chlorophyta) extracts against H 2O 2 induced oxidative stress in human breast adenocarcinoma cells. Sci Rep 2024; 14:27593. [PMID: 39528524 PMCID: PMC11555311 DOI: 10.1038/s41598-024-63960-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Accepted: 06/04/2024] [Indexed: 11/16/2024] Open
Abstract
In response to the growing demand for high-value bioactive compounds, microalgae cultivation has gained a significant acceleration in recent years. Among these compounds, antioxidants have emerged as essential constituents in the food, pharmaceutical, and cosmetics industries. This study focuses on Micractinium sp. ME05, a green microalgal strain previously isolated from hot springs flora in our laboratory. Micractinium sp. cells were extracted using six different solvents, and their antioxidant capacity, as well as total phenolic, flavonoid, and carotenoid contents were evaluated. The methanolic extracts demonstrated the highest antioxidant capacity, measuring 7.72 and 93.80 µmol trolox equivalents g-1 dry weight (DW) according to the DPPH and FRAP assays, respectively. To further characterize the biochemical profile, reverse phase high-performance chromatography (RP-HPLC) was employed to quantify twelve different phenolics, including rutin, gallic acid, benzoic acid, cinnamic acid, and β-carotene, in the microalgal extracts. Notably, the acetone extracts of Micractinium sp. grown mixotrophically contained a high amount of gallic acid (469.21 ± 159.74 µg g-1 DW), while 4-hydroxy benzoic acid (403.93 ± 20.98 µg g-1 DW) was the main phenolic compound in the methanolic extracts under heterotrophic cultivation. Moreover, extracts from Micractinium sp. exhibited remarkable cytoprotective activity by effectively inhibiting hydrogen peroxide-induced oxidative stress and cell death in human breast adenocarcinoma (MCF-7) cells. In conclusion, with its diverse biochemical composition and adaptability to different growth regimens, Micractinium sp. emerges as a robust candidate for mass cultivation in nutraceutical and food applications.
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Affiliation(s)
- Onur Bulut
- Department of Medical Biochemistry, Faculty of Medicine, Atilim University, 06830, Ankara, Türkiye
| | - Işkın Engin Köse
- Department of Biological Sciences, Middle East Technical University, Universiteler Mah., Dumlupinar Blv., No. 1, 06800, Ankara, Türkiye
| | - Çağla Sönmez
- Department of Medical Biology, Faculty of Medicine, Atilim University, 06830, Ankara, Türkiye.
| | - Hüseyin Avni Öktem
- Department of Biological Sciences, Middle East Technical University, Universiteler Mah., Dumlupinar Blv., No. 1, 06800, Ankara, Türkiye
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Dai YR, Wang D, Zhu YR, Yang KX, Jiao N, Sun ZL, Wang SK. Thermal-tolerant potential of ordinary Chlorella pyrenoidosa and the promotion of cell harvesting by heterotrophic cultivation at high temperature. Front Bioeng Biotechnol 2022; 10:1072942. [DOI: 10.3389/fbioe.2022.1072942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 11/14/2022] [Indexed: 12/04/2022] Open
Abstract
During the heterotrophic cultivation of microalgae, a cooled process against temperature rise caused by the metabolism of exogenous organic carbon sources greatly increases cultivation cost. Furthermore, microalgae harvesting is also a cost-consuming process. Cell harvesting efficiency is closely related to the characteristics of the algal cells. It may be possible to change cell characteristics through controlling culture conditions to make harvesting easier. In this study, the mesophilic Chlorella pyrenoidosa was found to be a thermal-tolerant species in the heterotrophic mode. The cells could maintain their maximal specific growth rate at 40°C and reached 1.45 day−1, which is equivalent to that of cultures at 35°C but significantly higher than those cultured at lower temperatures. Interestingly, the cells cultured at 40°C were much easier to be harvested than those at lower temperatures. The harvesting efficiency of the cells cultured at 40°C reached 96.83% after sedimentation for 240 min, while the cells cultured at lower temperatures were reluctant to settle. Likely, the same circumstance occurred when cells were harvested by centrifugation or flocculation. The promotion of cell harvesting for cells cultured at high temperatures was mainly attributed to increased cell size and decreased cell surface charge. To the best of our knowledge, this is the first report that cells cultured at high temperatures can promote microalgae harvesting. This study explores a new approach to simplify the cultivation and harvesting of microalgae, which effectively reduces the microalgae production cost.
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Kona R, Katakojwala R, Pallerla P, Sripadi P, Mohan SV. High oleic acid biosynthesis and its absolute quantification by GC/MS in oleaginous Scenedesmus sp. SVMIICT1 cultivated in dual stress phase. ALGAL RES 2022. [DOI: 10.1016/j.algal.2022.102865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Manrique SM. Biomass as a Cornerstone of a Circular Economy: Resources, Energy, and Environment. AGROECOLOGICAL FOOTPRINTS MANAGEMENT FOR SUSTAINABLE FOOD SYSTEM 2021:179-219. [DOI: 10.1007/978-981-15-9496-0_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2025]
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Contreras-Blancas E, Ruiz-Ordaz N, Galíndez-Mayer J, Torres-Gómez RE, Arias Ruiz A, Juárez-Ramírez C. Permeable reactive surface-biobarriers. Testing and evaluation of an ecotechnology for the removal of agrotoxic compounds carried by agricultural runoffs. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2020; 18:559-571. [PMID: 33312583 PMCID: PMC7721850 DOI: 10.1007/s40201-020-00482-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 04/28/2020] [Indexed: 05/27/2023]
Abstract
PURPOSE The objective of the work is to determine the best operating conditions for variants of an ecological engineering tool (permeable reactive surface biobarrier -PRSB-) potentially useful for the protection of water resources, preventing the arrival of sediments and pesticides transported by runoffs and tile drainage from agricultural lands, to water bodies. METHODS Four PRB-prototypes were constructed as fixed-bed horizontal channels packed with a porous material supporting an enriched microbial biofilm. Their dynamic and stoichiometric performance was evaluated in the presence or absence of granular activated carbon, with limiting or sufficient O2 supply. The removal of the pesticides and their leading catabolic derivatives were determined by HPLC. The most abundant cultivable microorganisms were isolated and identified by the sequencing of 16sDNA amplicons. RESULTS The pollutant removal efficiencies obtained in the aerobic biobarriers or microaerophilia were similar. In addition, slight differences were observed in the presence of GAC as an adsorbent, meaning that the most economical and straightforward type of biobarrier was adequate to remove the pollutants studied. In addition, among the most abundant microorganisms isolated in the microbial biofilms colonizing the aerobic biobarriers, the microalgae Micractinium sp. showed the capacity to accumulate the insecticides permethrin and cypermethrin. CONCLUSIONS The main observed role of Micractinium sp. in the aerobic barriers was the bioaccumulation of pyrethroids, meaning that biosorption is also a valuable removal mechanism operating in the aerobic PRBs. In this aspect, they behave analogously to subsurface constructed wetlands but, instead of superficial plant life, aerobic PRSBs host microalgae.
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Affiliation(s)
- Eduardo Contreras-Blancas
- Laboratorio de Bioingeniería, Departamento de Ingeniería Bioquímica, ENCB, Instituto Politécnico Nacional, Av. Wilfrido Massieu 399, Nueva Industrial Vallejo, Ciudad de México, CP 07738 México
| | - Nora Ruiz-Ordaz
- Laboratorio de Bioingeniería, Departamento de Ingeniería Bioquímica, ENCB, Instituto Politécnico Nacional, Av. Wilfrido Massieu 399, Nueva Industrial Vallejo, Ciudad de México, CP 07738 México
| | - Juvencio Galíndez-Mayer
- Laboratorio de Bioingeniería, Departamento de Ingeniería Bioquímica, ENCB, Instituto Politécnico Nacional, Av. Wilfrido Massieu 399, Nueva Industrial Vallejo, Ciudad de México, CP 07738 México
| | - Rosario Erea Torres-Gómez
- Laboratorio de Bioingeniería, Departamento de Ingeniería Bioquímica, ENCB, Instituto Politécnico Nacional, Av. Wilfrido Massieu 399, Nueva Industrial Vallejo, Ciudad de México, CP 07738 México
| | - Alfredo Arias Ruiz
- Laboratorio de Bioingeniería, Departamento de Ingeniería Bioquímica, ENCB, Instituto Politécnico Nacional, Av. Wilfrido Massieu 399, Nueva Industrial Vallejo, Ciudad de México, CP 07738 México
| | - Cleotilde Juárez-Ramírez
- Laboratorio de Bioingeniería, Departamento de Ingeniería Bioquímica, ENCB, Instituto Politécnico Nacional, Av. Wilfrido Massieu 399, Nueva Industrial Vallejo, Ciudad de México, CP 07738 México
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Abu-Ghosh S, Dubinsky Z, Iluz D. Acclimation of thermotolerant algae to light and temperature interaction 1. JOURNAL OF PHYCOLOGY 2020; 56:662-670. [PMID: 31913505 DOI: 10.1111/jpy.12964] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 12/17/2019] [Indexed: 06/10/2023]
Abstract
Here, we explore the responses of photosynthesis and related cellular processes in the thermotolerant microalga Micractinium sp. acclimated to limiting and saturating irradiances combined with elevated temperatures, using a novel computer-controlled multi-sensor system. This system allows for the monitoring of online values of oxygen exchange during photosynthesis and respiration with high accuracy. Micractinium sp. cells showed maximum growth and net oxygen production rates under the optimal temperature of 25°C regardless of the light acclimation conditions. Our results show that the upper thermal threshold for Micractinium sp. photosynthesis and growth ranges between 35°C and 40°C. This microalga exhibited stable photosynthetic efficiency and effective non-photochemical quenching (NPQ) under saturating light, and was more susceptible to temperature change when acclimated to limiting light levels. These results demonstrate that the acclimation of thermotolerant microalgae to saturating light helps to enhance the thermal tolerance of PSII. This feature results from enhanced heat stability of PSII photochemistry and oxygen evolution.
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Affiliation(s)
- Said Abu-Ghosh
- Faculty of Life Sciences, The Mina and Everard Goodman, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Zvy Dubinsky
- Faculty of Life Sciences, The Mina and Everard Goodman, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - David Iluz
- Faculty of Life Sciences, The Mina and Everard Goodman, Bar-Ilan University, Ramat-Gan, 5290002, Israel
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Isolation and Characterization of Microalgae from Diverse Pakistani Habitats: Exploring Third-Generation Biofuel Potential. ENERGIES 2019. [DOI: 10.3390/en12142660] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Production of microalgae as feedstock for biofuels must deal with a number of challenges including constraints imposed by local conditions. One solution is to use indigenous strains adapted to local climatic conditions. The present report describes the isolation, identification, and characterization of 32 microalgal strains from different ecological habitats: desert freshwater channels, northern region, and saline regions of Pakistan. The effects of temperature on algal growth rates, biomass productivity, and lipid content were determined through growth at 12, 20, and 35 °C for 15 days under 2% CO2 Responses to temperature varied among species with 20 °C being the optimum temperature in general, although, exceptionally, the best overall growth rate was found for strain S29 (0.311 d−1) at 12 °C. In some cases high biomass productivity was observed at 35 °C, and, depending upon the strain, the maximum lipid content was obtained at different temperatures, including 12 °C. Fatty acid methyl ester (FAME) analysis showed that the major fatty acids present were palmitic, stearic, oleic, linoleic, and linolenic. Oleic acid (C18:1) was the predominant fatty acid, with the specific FAME profile varying with strain. Thus, there is a rich diversity of microalgal strains native to Pakistan, some of which, characterized here, could be suitable for biodiesel production or other biotechnological applications.
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He Q, Yang H, Hu C. Effects of temperature and its combination with high light intensity on lipid production of Monoraphidium dybowskii Y2 from semi-arid desert areas. BIORESOURCE TECHNOLOGY 2018; 265:407-414. [PMID: 29933188 DOI: 10.1016/j.biortech.2018.06.044] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 06/12/2018] [Accepted: 06/13/2018] [Indexed: 06/08/2023]
Abstract
Temperature and light intensity are important environmental factors influencing microalgae for biodiesel production. The aim of present work was to study the effects of temperature (15 °C, 25 °C, and 35 °C) and its combination with high light intensity (HL, 400 μmol photon m-2 s-1) on lipid production of Monoraphidium dybowskii Y2 which was isolated from desert. The results demonstrated that algal growth was only inhibited at 15 °C. Promoted lipid content and decreased Fv/Fm were observed in 15 °C and 35 °C. Cellular carbohydrate, protein conversion and membrane lipid (MGDG, DGDG and SQDG) remodeling contributes for lipid accumulation. Stress combined temperatures with HL are benefit for lipid production, especially desired neutral lipid productivity all exceed 40 mg L-1 d-1. Fatty acids compositions of C16:0 and C18:1 were further promoted under 15 °C or 35 °C combined with HL. Thus, M. dybowskii Y2 will well-adapted to outdoors cultivation for biodiesel production.
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Affiliation(s)
- Qiaoning He
- Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Environmental Microbial Technology Center of Hubei Province, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan 430062, China
| | - Haijian Yang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Chunxiang Hu
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
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Abu-Ghosh S, Dubinsky Z, Banet G, Iluz D. Optimizing photon dose and frequency to enhance lipid productivity of thermophilic algae for biofuel production. BIORESOURCE TECHNOLOGY 2018; 260:374-379. [PMID: 29665528 DOI: 10.1016/j.biortech.2018.03.110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Revised: 03/21/2018] [Accepted: 03/22/2018] [Indexed: 05/18/2023]
Abstract
The aim of this work was to examine the potential of the thermophilic green microalga Micractinium sp. to accumulate triacylglycerols (TAGs) and to develop a light strategy to increase TAG productivity in this alga. To this end, dense cultures of Micractinium sp. were grown at 37 °C under nitrogen (N) starvation and exposed to a light intensity of 1000 µmol photons m-2 s-1 of different light regimes. The highest per-biomass TAG-content and maximal volumetric productivities of TAG were displayed by the cultures grown under flashing light of 5 Hz with 50% duty cycle. Based on the results, a sufficiently high-starting culture density should be combined with a high irradiance delivered by an appropriate light regime to enhance the production of biomass enriched TAGs.
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Affiliation(s)
- Said Abu-Ghosh
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel; Bar Ilan Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat-Gan 5290002, Israel.
| | - Zvy Dubinsky
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Gabi Banet
- The Dead Sea and Arava Science Center, 86910, Israel
| | - David Iluz
- The Mina and Everard Goodman Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan 5290002, Israel
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Xue Z, Wan F, Yu W, Liu J, Zhang Z, Kou X. Edible Oil Production From Microalgae: A Review. EUR J LIPID SCI TECH 2018. [DOI: 10.1002/ejlt.201700428] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhaohui Xue
- School of Chemical Engineering and Technology; Tianjin University; 300072 Tianjin China
| | - Fang Wan
- School of Chemical Engineering and Technology; Tianjin University; 300072 Tianjin China
| | - Wancong Yu
- Tianjin Academy of Agricultural Sciences; 300381 Tianjin China
| | - Jing Liu
- School of Chemistry and Chemical Engineering; Qinghai Nationalities University; 810007 Qinghai China
| | - Zhijun Zhang
- Tianjin Academy of Agricultural Sciences; 300381 Tianjin China
| | - Xiaohong Kou
- School of Chemical Engineering and Technology; Tianjin University; 300072 Tianjin China
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Engin IK, Cekmecelioglu D, Yücel AM, Oktem HA. Evaluation of heterotrophic and mixotrophic cultivation of novel Micractinium sp. ME05 on vinasse and its scale up for biodiesel production. BIORESOURCE TECHNOLOGY 2018; 251:128-134. [PMID: 29274519 DOI: 10.1016/j.biortech.2017.12.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 12/05/2017] [Accepted: 12/07/2017] [Indexed: 06/07/2023]
Abstract
Direct disposal of vinasse, a by-product of molasses fermentation plants, threatens environmental health. This study investigated the usage of vinasse as a nutrient source for the heterotrophic and mixotrophic cultivation of novel Micractinium sp. ME05. The 500-mL flask experiments resulted in higher biomass productivities under mixotrophic conditions (0.16 ± 0.01 g L-1 day1) than the heterotrophic conditions (0.13 ± 0.01 g L-1 day1). A 1.7-fold increase in biomass productivity was achieved by scaling up from 500-mL flasks (0.16 ± 0.01 g L-1 day1) to 2-L flasks (0.27 ± 0.019 g L-1 day1). The 5-L bioreactor experiments resulted in a biomass productivity of 0.32 ± 0.2 g L-1 day1 and lipid productivity of 3.4 ± 0.20 g L-1 day-1. This study demonstrated that Micractinium sp. ME05 can be cultivated with vinasse to produce large amounts of biomass. The FAME profile of mixotrophic Micractinium sp. ME05 cells was promising for further biodiesel production. This study highlights the feasibility of industrial by- product-vinasse as the nutrient source for biomass and lipid productions using the novel Micractinium sp. ME05 cells.
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Affiliation(s)
- Iskin Kose Engin
- Middle East Technical University, Department of Biotechnology, 06800 Ankara, Turkey; Middle East Technical University, Central Laboratory, Molecular Biology and Biotechnology R&D Center, 06800 Ankara, Turkey
| | - Deniz Cekmecelioglu
- Middle East Technical University, Department of Food Engineering, 06800 Ankara, Turkey
| | - Ayse Meral Yücel
- Middle East Technical University, Department of Biotechnology, 06800 Ankara, Turkey; Middle East Technical University, Department of Biological Sciences, 06800 Ankara, Turkey
| | - Huseyin Avni Oktem
- Middle East Technical University, Department of Biotechnology, 06800 Ankara, Turkey; Middle East Technical University, Department of Biological Sciences, 06800 Ankara, Turkey; Nanobiz Ltd. METU-Technopolis, Ankara, Turkey.
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Ma C, Wen H, Xing D, Pei X, Zhu J, Ren N, Liu B. Molasses wastewater treatment and lipid production at low temperature conditions by a microalgal mutant Scenedesmus sp. Z-4. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:111. [PMID: 28473870 PMCID: PMC5414357 DOI: 10.1186/s13068-017-0797-x] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 04/20/2017] [Indexed: 05/04/2023]
Abstract
BACKGROUND Simultaneous wastewater treatment and lipid production by oleaginous microalgae show great potential to alleviate energy shortage and environmental pollution, because they exhibit tremendous advantages over traditional activated sludge. Currently, most research on wastewater treatment by microalgal are carried out at optimized temperature conditions (25-35 °C), but no information about simultaneous wastewater treatment and lipid production by microalgae at low temperatures has been reported. Microalgal growth and metabolism will be inhibited at low temperature conditions, and satisfactory wastewater treatment performance will be not obtained. Therefore, it is critical to domesticate and screen superior microalgal strains with low temperature adaptability, which is of great importance for wastewater treatment and biodiesel production. RESULTS In this work, simultaneous wastewater treatment and lipid production were achieved by a microalgal mutant Scenedesmus sp. Z-4 at the low temperature conditions (4, 10, and 15 °C). The results showed that algal growth was inhibited at 4, 10, and 15 °C compared to that at the optimal temperature of 25 °C. However, decreased temperature had no significant effect on the total cellular lipid content of algae. Importantly, lipid productivity at 10 °C was compromised by more net energy output relevant to biodiesel production, which demonstrated that the low temperature of 10 °C was favorable to wastewater treatment and energy recovery by Scenedesmus sp. Z-4. When molasses wastewater with optimal COD concentration of 8000 mg L-1, initial inoculation ratio of 15%, and C/N ratio of 15 was used to cultivate microalgae, the maximum removal rate of COD, TN, and TP at 10 °C reached 87.2, 90.5, and 88.6%, respectively. In addition, lipid content of 28.9% and lipid productivity of 94.4 mg L-1 day-1 were obtained. CONCLUSIONS Scenedesmus sp. Z-4 had good adaptability to low temperature conditions, and showed great potential to realize simultaneous wastewater treatment and lipid production at low temperatures. The proposed approach in the study was simple compared to other wastewater treatment methods, and this potential novel process was still efficient to remove COD, N, and P at low temperatures. Thus, it had a vital significance for the wastewater treatment in low temperature regions.
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Affiliation(s)
- Chao Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, P. O. Box 2614, 73 Huanghe Road, Harbin, 150090 China
| | - Hanquan Wen
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, P. O. Box 2614, 73 Huanghe Road, Harbin, 150090 China
| | - Defeng Xing
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, P. O. Box 2614, 73 Huanghe Road, Harbin, 150090 China
| | - Xuanyuan Pei
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, P. O. Box 2614, 73 Huanghe Road, Harbin, 150090 China
| | - Jiani Zhu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, P. O. Box 2614, 73 Huanghe Road, Harbin, 150090 China
| | - Nanqi Ren
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, P. O. Box 2614, 73 Huanghe Road, Harbin, 150090 China
| | - Bingfeng Liu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, P. O. Box 2614, 73 Huanghe Road, Harbin, 150090 China
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