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Tavčar Verdev P, Dolinar M. A Pipeline for the Isolation and Cultivation of Microalgae and Cyanobacteria from Hypersaline Environments. Microorganisms 2025; 13:603. [PMID: 40142496 PMCID: PMC11945091 DOI: 10.3390/microorganisms13030603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2024] [Revised: 02/21/2025] [Accepted: 02/25/2025] [Indexed: 03/28/2025] Open
Abstract
Microorganisms in high-salinity environments play a critical role in biogeochemical cycles, primary production, and the biotechnological exploitation of extremozymes and bioactive compounds. The main challenges in current research include isolating and cultivating these microorganisms under laboratory conditions and understanding their complex adaptive mechanisms to high salinity. Currently, universally recognized protocols for isolating microalgae and cyanobacteria from salt pans, salterns, and similar natural habitats are lacking. Establishing axenic laboratory cultures is essential for identifying new species thriving in high-salinity environments and for exploring the synthesis of high-value metabolites by these microorganisms ex situ. Our ongoing research primarily focuses on photosynthetic microorganisms with significant biotechnological potential, particularly for skincare applications. By integrating data from the existing literature with our empirical findings, we propose a standardized pipeline for the isolation and laboratory cultivation of microalgae and cyanobacteria originating from aqueous environments characterized by elevated salt concentrations, such as solar salterns. This approach will be particularly useful for researchers working with microorganisms adapted to hypersaline waters.
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Affiliation(s)
| | - Marko Dolinar
- Department of Chemistry and Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, 1000 Ljubljana, Slovenia
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Selivanova EA, Yakimov MM, Kataev VY, Khlopko YA, Balkin AS, Plotnikov AO. The Cultivation of Halophilic Microalgae Shapes the Structure of Their Prokaryotic Assemblages. Microorganisms 2024; 12:1947. [PMID: 39458257 PMCID: PMC11509377 DOI: 10.3390/microorganisms12101947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2024] [Revised: 09/16/2024] [Accepted: 09/19/2024] [Indexed: 10/28/2024] Open
Abstract
The influence of microalgae on the formation of associated prokaryotic assemblages in halophilic microbial communities is currently underestimated. The aim of this study was to characterize shifts in prokaryotic assemblages of halophilic microalgae upon their transition to laboratory cultivation. Monoalgal cultures belonging to the classes Chlorodendrophyceae, Bacillariophyceae, Trebouxiophyceae, and Chlorophyceae were isolated from habitats with intermediate salinity, about 100 g/L, nearby Elton Lake (Russia). Significant changes were revealed in the structure of algae-associated prokaryotic assemblages, indicating that microalgae supported sufficiently diverse and even communities of prokaryotes. Despite some similarities in their prokaryotic assemblages, taxon-specific complexes of dominant genera were identified for each microalga species. These complexes were most different among Alphaproteobacteria, likely due to their close association with microalgae. Other taxon-specific bacteria included members of phylum Verrucomicrobiota (Coraliomargarita in assemblages of Navicula sp.) and class Gammaproteobacteria (Salinispirillum in microbiomes of A. gracilis). After numerous washings of algal cells, only alphaproteobacteria Marivibrio remained in all assemblages of T. indica, likely due to a firm attachment to the microalgae cells. Our results may be useful for further efforts to develop technologies applied for industrial cultivation of halophilic microalgae and for developing approaches to obtain new prokaryotes with a microalgae-associated lifestyle.
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Affiliation(s)
- Elena A. Selivanova
- Institute for Cellular and Intracellular Symbiosis of the Ural Branch of Russian Academy of Sciences, Orenburg Federal Research Center of the Ural Branch of Russian Academy of Sciences, 460000 Orenburg, Russia; (V.Y.K.); (Y.A.K.); (A.S.B.)
| | - Michail M. Yakimov
- Extreme Microbiology, Biotechnology and Astrobiology Group, Institute of Polar Research, The Institute of Polar Sciences of the National Research Council (ISP-CNR), 98122 Messina, Italy;
| | - Vladimir Y. Kataev
- Institute for Cellular and Intracellular Symbiosis of the Ural Branch of Russian Academy of Sciences, Orenburg Federal Research Center of the Ural Branch of Russian Academy of Sciences, 460000 Orenburg, Russia; (V.Y.K.); (Y.A.K.); (A.S.B.)
| | - Yuri A. Khlopko
- Institute for Cellular and Intracellular Symbiosis of the Ural Branch of Russian Academy of Sciences, Orenburg Federal Research Center of the Ural Branch of Russian Academy of Sciences, 460000 Orenburg, Russia; (V.Y.K.); (Y.A.K.); (A.S.B.)
| | - Alexander S. Balkin
- Institute for Cellular and Intracellular Symbiosis of the Ural Branch of Russian Academy of Sciences, Orenburg Federal Research Center of the Ural Branch of Russian Academy of Sciences, 460000 Orenburg, Russia; (V.Y.K.); (Y.A.K.); (A.S.B.)
| | - Andrey O. Plotnikov
- Institute for Cellular and Intracellular Symbiosis of the Ural Branch of Russian Academy of Sciences, Orenburg Federal Research Center of the Ural Branch of Russian Academy of Sciences, 460000 Orenburg, Russia; (V.Y.K.); (Y.A.K.); (A.S.B.)
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Pandey A, Kant G, Chaudhary A, Amesho KTT, Reddy K, Bux F. Axenic green microalgae for the treatment of textile effluent and the production of biofuel: a promising sustainable approach. World J Microbiol Biotechnol 2024; 40:81. [PMID: 38285224 PMCID: PMC10824862 DOI: 10.1007/s11274-023-03863-2] [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: 07/18/2023] [Accepted: 11/30/2023] [Indexed: 01/30/2024]
Abstract
An integrated approach to nutrient recycling utilizing microalgae could provide feasible solutions for both environmental control and energy production. In this study, an axenic microalgae strain, Chlorella sorokiniana ASK25 was evaluated for its potential as a biofuel feedstock and textile wastewater (TWW) treatment. The microalgae isolate was grown on TWW supplemented with different proportions of standard BG-11 medium varying from 0 to 100% (v/v). The results showed that TWW supplemented with 20% (v/v) BG11 medium demonstrated promising results in terms of Chlorella sorokiniana ASK25 biomass (3.80 g L-1), lipid production (1.24 g L-1), nutrients (N/P, > 99%) and pollutant removal (chemical oxygen demand (COD), 99.05%). The COD level dropped by 90% after 4 days of cultivation, from 2,593.33 mg L-1 to 215 mg L-1; however, after day 6, the nitrogen (-NO3-1) and total phosphorus (TP) levels were reduced by more than 95%. The biomass-, total lipid- and carbohydrate- production, after 6 days of cultivation were 3.80 g L-1, 1.24 g L-1, and 1.09 g L-1, respectively, which were 2.15-, 2.95- and 3.30-fold higher than Chlorella sorokiniana ASK25 grown in standard BG-11 medium (control). In addition, as per the theoretical mass balances, 1 tonne biomass of Chlorella sorokiniana ASK25 might yield 294.5 kg of biodiesel and 135.7 kg of bioethanol. Palmitic acid, stearic acid, and oleic acid were the dominant fatty acids found in the Chlorella sorokiniana ASK25 lipid. This study illustrates the potential use of TWW as a microalgae feedstock with reduced nutrient supplementation (20% of TWW). Thus, it can be considered a promising feedstock for economical biofuel production.
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Affiliation(s)
- Ashutosh Pandey
- Institute for Water and Wastewater Technology, Durban University of Technology, 19 Steve Biko Road, Durban, 4000, South Africa
- BiotechnologyBioenergy Research Laboratory, Department of Biotechnology, AKS University Satna, Satna, MP, 485001, India
| | - Gaurav Kant
- Department of Biotechnology, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, UP, 211004, India
| | - Ashvani Chaudhary
- Department of Biotechnology, University)IMS Engineering College (Affiliated to Dr. APJ Abdul Kalam Technical University, Lucknow), Lucknow, Ghaziabad, UP, 201015, India
- Amity Institute of Biotechnology, Amity University Noida Campus, Sec-125, Noida, 201313, UP, India
| | - Kaissan T T Amesho
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, 804, Taiwan
- Centre for Emerging Contaminants Research, National Sun Yat-Sen University, Kaohsiung, 804, Taiwan
- Centre for Environmental Studies, The International University of Management, Main Campus, Dorado Park Ext 1, Windhoek, 10001, Namibia
| | - Karen Reddy
- Institute for Water and Wastewater Technology, Durban University of Technology, 19 Steve Biko Road, Durban, 4000, South Africa
| | - Faizal Bux
- Institute for Water and Wastewater Technology, Durban University of Technology, 19 Steve Biko Road, Durban, 4000, South Africa.
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Isolation, identification, and chemical composition analysis of nine microalgal and cyanobacterial species isolated in lagoons of Western Greece. ALGAL RES 2022. [DOI: 10.1016/j.algal.2022.102935] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Sinha A, Kumar R, Goswami G, Das D. Process engineering strategy for large scale outdoor cultivation of Tetradesmus obliquus CT02 coupled with pH guided CO 2 feeding. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 318:115539. [PMID: 35728376 DOI: 10.1016/j.jenvman.2022.115539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Revised: 05/20/2022] [Accepted: 06/13/2022] [Indexed: 06/15/2023]
Abstract
A novel CO2 tolerant microalga Tetradesmus obliquus CT02, was previously evaluated to be a suitable bio refinery platform for synthesis of bioactive molecules, biodiesel, and biofertilizer. In the present study, a process engineering strategy was developed targeting improved growth performance of the strain at large scale under fluctuating outdoor environmental conditions. The strategy relies on maintaining pH of the culture at its optimal value via cascade control with CO2 feeding. The strategy was developed at laboratory scale bubble column photobioreactor under diurnal variation of simulated sunlight intensity and was further validated through growth performance of the strain under outdoor conditions in a 100 L airlift bioreactor. Under laboratory condition, 53.3% and 85.16% improvement in biomass concentration (1.87 g L-1) and productivity (114.8 mg L-1 day-1) was achieved as compared to the uncontrolled pH, respectively. The strategy demonstrated a significant improvement in biomass concentration and productivity by 225.7% and 121.6% respectively, compared to the pH uncontrolled batch, even under outdoor fluctuating environmental condition.
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Affiliation(s)
- Ankan Sinha
- Department of Biosciences & Bioengineering, Indian Institute of Technology, Guwahati, Assam, 781039, India
| | - Ratan Kumar
- Department of Biosciences & Bioengineering, Indian Institute of Technology, Guwahati, Assam, 781039, India
| | - Gargi Goswami
- Department of Biotechnology, Gandhi Institute of Technology and Management (GITAM) University, Visakhapatnam, Andhra Pradesh, 530045, India
| | - Debasish Das
- Department of Biosciences & Bioengineering, Indian Institute of Technology, Guwahati, Assam, 781039, India.
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Fawzy MA, Al-Yasi HM, Galal TM, Hamza RZ, Abdelkader TG, Ali EF, Hassan SHA. Statistical optimization, kinetic, equilibrium isotherm and thermodynamic studies of copper biosorption onto Rosa damascena leaves as a low-cost biosorbent. Sci Rep 2022; 12:8583. [PMID: 35595800 PMCID: PMC9123003 DOI: 10.1038/s41598-022-12233-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Accepted: 05/03/2022] [Indexed: 12/11/2022] Open
Abstract
In this study, Rosa damascena leaf powder was evaluated as a biosorbent for the removal of copper from aqueous solutions. Process variables such as the biosorbent dose, pH, and initial copper concentration were optimized using response surface methodology. A quadratic model was established to relate the factors to the response based on the Box-Behnken design. Analysis of variance (ANOVA) was used to assess the experimental data, and multiple regression analysis was used to fit it to a second-order polynomial equation. A biosorbent dose of 4.0 g/L, pH of 5.5, and initial copper concentration of 55 mg/L were determined to be the best conditions for copper removal. The removal of Cu2+ ions was 88.7% under these optimal conditions, indicating that the experimental data and model predictions were in good agreement. The biosorption data were well fitted to the pseudo-second-order and Elovich kinetic models. The combination of film and intra-particle diffusion was found to influence Cu2+ biosorption. The Langmuir and Dubinin-Radushkevich isotherm models best fit the experimental data, showing a monolayer isotherm with a qmax value of 25.13 mg/g obtained under optimal conditions. The thermodynamic parameters showed the spontaneity, feasibility and endothermic nature of adsorption. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy were used to characterize the biosorbent before and after Cu2+ biosorption, revealing its outstanding structural characteristics and high surface functional group availability. In addition, immobilized R. damascena leaves adsorbed 90.7% of the copper from aqueous solution, which is more than the amount adsorbed by the free biosorbent (85.3%). The main mechanism of interaction between R. damascena biomass and Cu2+ ions is controlled by both ion exchange and hydrogen bond formation. It can be concluded that R. damascena can be employed as a low-cost biosorbent to remove heavy metals from aqueous solutions.
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Affiliation(s)
- Mustafa A Fawzy
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia.
| | - Hatim M Al-Yasi
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - Tarek M Galal
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - Reham Z Hamza
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - Tharwat G Abdelkader
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - Esmat F Ali
- Department of Biology, College of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - Sedky H A Hassan
- Department of Biology, College of Science, Sultan Qaboos University, Muscat, 123, Oman
- Department of Botany and Microbiology, Faculty of Science, New Valley University, El-Kharga, 72511, Egypt
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Fawzy MA, Darwish H, Alharthi S, Al-Zaban MI, Noureldeen A, Hassan SHA. Process optimization and modeling of Cd 2+ biosorption onto the free and immobilized Turbinaria ornata using Box-Behnken experimental design. Sci Rep 2022; 12:3256. [PMID: 35228594 PMCID: PMC8885682 DOI: 10.1038/s41598-022-07288-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 02/03/2022] [Indexed: 12/07/2022] Open
Abstract
The release of effluents containing cadmium ions into aquatic ecosystems is hazardous to humans and marine organisms. In the current investigation, biosorption of Cd2+ ions from aqueous solutions by freely suspended and immobilized Turbinaria ornata biomasses was studied. Compared to free cells (94.34%), the maximum Cd2+ removal efficiency reached 98.65% for immobilized cells obtained via Box-Behnken design under optimized conditions comprising algal doses of 5.04 g L-1 and 4.96 g L-1, pH values of 5.06 and 6.84, and initial cadmium concentrations of 25.2 mg L-1 and 26.19 mg L-1, respectively. Langmuir, Freundlich, and Temkin isotherm models were suitably applied, providing the best suit of data for free and immobilized cells, but the Dubinin-Radushkevich model only matched the immobilized algal biomass. The maximum biosorption capacity of Cd2+ ions increased with the immobilized cells (29.6 mg g-1) compared to free cells (23.9 mg g-1). The Cd2+ biosorption data obtained for both biomasses followed pseudo-second-order and Elovich kinetic models. In addition, the biosorption process is controlled by film diffusion followed by intra-particle diffusion. Cd2+ biosorption onto the free and immobilized biomasses was spontaneous, feasible, and endothermic in nature, according to the determined thermodynamic parameters. The algal biomass was further examined via SEM/EDX and FTIR before and after Cd2+ biosorption. SEM/EDX analysis revealed Cd2+ ion binding onto the algal surface. Additionally, FTIR analysis confirmed the presence of numerous functional groups (hydroxyl, carboxyl, amine, phosphate, etc.) participating in Cd2+ biosorption. This study verified that immobilized algal biomasses constitute a cost-effective and favorable biosorbent material for heavy metal removal from ecosystems.
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Affiliation(s)
- Mustafa A Fawzy
- Biology Department, Faculty of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia.
| | - Hadeer Darwish
- Biotechnology Department, Faculty of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - Sarah Alharthi
- Chemistry Department, Faculty of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - Mayasar I Al-Zaban
- Biology Department, Faculty of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11671, Saudi Arabia.
| | - Ahmed Noureldeen
- Biology Department, Faculty of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia
| | - Sedky H A Hassan
- Department of Biology, College of Science, Sultan Qaboos University, 123, Muscat, Oman
- Department of Botany and Microbiology, Faculty of Science, New Valley University, El-Kharga, 72511, Egypt
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The Effect of Various Salinities and Light Intensities on the Growth Performance of Five Locally Isolated Microalgae [Amphidinium carterae, Nephroselmis sp., Tetraselmis sp. (var. red pappas), Asteromonas gracilis and Dunaliella sp.] in Laboratory Batch Cultures. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2021. [DOI: 10.3390/jmse9111275] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
After a 1.5-year screening survey in the lagoons of Western Greece in order to isolate and culture sturdy species of microalgae for aquaculture or other value-added uses, as dictated primarily by satisfactory potential for their mass culture, five species emerged, and their growth was monitored in laboratory conditions. Amphidinium carterae, Nephroselmis sp., Tetraselmis sp. (var. red pappas), Asteromonas gracilis, and Dunaliella sp. were batch cultured using low (20 ppt), sea (40 ppt), and high salinity (50 or 60 or 100 ppt) and in combination with low (2000 lux) and high (8000 lux) intensity illumination. The results exhibited that all these species can be grown adequately in all salinities and with the best growth in terms of maximum cell density, specific growth rate (SGR), and biomass yield (g dry weight/L) at high illumination (8000 lux). The five species examined exhibited different responses in the salinities used, whereby Amphidinium clearly performs best in 20 ppt, far better than 40 ppt, and even more so than 50 ppt. Nephroselmis and Tetraselmis grow almost the same in 20 and 40 ppt and less well in 60 ppt. Asteromonas performs best in 100 ppt, although it can grow quite well in both 40 and 60 ppt. Dunaliella grows equally well in all salinities (20, 40, 60 ppt). Concerning the productivity, assessed as the maximum biomass yield at the end of the culture period, the first rank is occupied by Nephroselmis with ~3.0 g d.w./L, followed by Tetraselmis (2.0 g/L), Dunaliella (1.58 g/L), Amphidinium (1.19 g/L), and Asteromonas (0.7 g/L) with all values recorded at high light (8000 lux).
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Gümüş D, Gümüş F. Removal of Hydroxychloroquine Using Engineered Biochar from Algal Biodiesel Industry Waste: Characterization and Design of Experiment (DoE). ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2021; 47:7325-7334. [PMID: 34660171 PMCID: PMC8505786 DOI: 10.1007/s13369-021-06235-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Accepted: 09/15/2021] [Indexed: 12/20/2022]
Abstract
Adsorption of hydroxychloroquine (HCQ) onto H3PO4-activated Cystoseira barbata (Stackhouse) C. Agardh (derived from algal biodiesel industry waste) biochar was investigated via batch experiments and mathematical models. The activated biochar (BC-H) was produced in a single step by using the microwave irradiation method. Thus, it was obtained with a low cost, energy efficiency and by promoting clean production processes. BC-H exhibited a remarkable adsorption efficiency (98.9%) and large surface area (1088.806 m2 g−1) for removal of HCQ. The Langmuir isotherm and the pseudo-second-order kinetic models were the best fit for the equilibrium adsorption and kinetics experiments, and the maximum monolayer adsorption capacity (qmax) was found to be 353.58 µg g−1. Additionally, the experiments with real wastewater showed that BC-H's ability to adsorb HCQ was not affected by competitive ions in the water. The Taguchi orthogonal array (L16 OA) experimental design was applied for the effective cost optimization analyses of the adsorption process by considering four levels and four controllable factors (initial pH, HCQ concentration, amount of adsorbent and contact time). Scanning electron microscopy, Fourier transform infrared spectroscopy and Brunauer–Emmett–Teller analyses were used for characterizing the adsorbent. The findings showed that BC-H can be used as an effective and low-cost adsorbent in the removal of HCQ from water.
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Affiliation(s)
- Dilek Gümüş
- Directorate of Construction and Technical Works, Sinop University, 57000 Sinop, Turkey
| | - Fatih Gümüş
- Department of Biology, Faculty of Arts and Science, Sinop University, 57000 Sinop, Turkey
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Fawzy MA, El-Otify AM, Adam MS, Moustafa SSA. The impact of abiotic factors on the growth and lipid accumulation of some green microalgae for sustainable biodiesel production. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:42547-42561. [PMID: 33813694 DOI: 10.1007/s11356-021-13781-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Accepted: 03/30/2021] [Indexed: 06/12/2023]
Abstract
Three species of freshwater planktonic green microalgae: Ankistrodesmus braunii, Ankistrodesmus falcatus, and Scenedesmus incrassatulus, were isolated from the Nile water in Upper Egypt. These microalgae were exposed to nutritional (nitrogen, phosphorus, and iron) limitations and salinity stress to study their effects on the algal growth and to elevate the lipid content within their cells. The results indicated that exposure to these conditions had a significant impact on the algal growth. The lipid content of the studied algae increased as a result of the salinity stress. The highest lipid content was recorded in A. braunii culture treated with 50 mM NaCl (34.4% of dry weight) and S. incrassatulus cultures treated with 100 mM NaCl (37.7% of dry weight) on the 6th day of cultivation, while the culture of A. falcatus treated with 100 mM NaCl recorded the maximum lipid content (53% of dry weight) on the 10th day of the experiment. The biodiesel quality parameters of the fatty acid methyl ester profile of S. incrassatulus appeared to be in agreement with the international criteria. S. incrassatulus could be regarded as a quite promising feedstock for the biodiesel production.
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Affiliation(s)
- Mustafa A Fawzy
- Biology Department, Faculty of Science, Taif University, P.O. Box 11099, Taif, 21944, Saudi Arabia.
- Botany & Microbiology Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt.
| | - Ahmed M El-Otify
- Botany Department, Faculty of Science, Aswan University, Aswan, 81528, Egypt
| | - Mahmoud S Adam
- Botany & Microbiology Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt
| | - Safaa S A Moustafa
- Botany Department, Faculty of Science, Aswan University, Aswan, 81528, Egypt
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Free Fatty Acids Reduction in Waste Cooking Oil by
Rhodosporidium toruloides
and Simultaneous Carotenoids, Lipids, and PAL Enzyme Production in a Two‐Phase Culture System. EUR J LIPID SCI TECH 2021. [DOI: 10.1002/ejlt.202000354] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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12
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Microalgae Cultivation Technologies as an Opportunity for Bioenergetic System Development—Advantages and Limitations. SUSTAINABILITY 2020. [DOI: 10.3390/su12239980] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Microalgal biomass is currently considered as a sustainable and renewable feedstock for biofuel production (biohydrogen, biomethane, biodiesel) characterized by lower emissions of hazardous air pollutants than fossil fuels. Photobioreactors for microalgae growth can be exploited using many industrial and domestic wastes. It allows locating the commercial microalgal systems in areas that cannot be employed for agricultural purposes, i.e., near heating or wastewater treatment plants and other industrial facilities producing carbon dioxide and organic and nutrient compounds. Despite their high potential, the large-scale algal biomass production technologies are not popular because the systems for biomass production, separation, drainage, and conversion into energy carriers are difficult to explicitly assess and balance, considering the ecological and economical concerns. Most of the studies presented in the literature have been carried out on a small, laboratory scale. This significantly limits the possibility of obtaining reliable data for a comprehensive assessment of the efficiency of such solutions. Therefore, there is a need to verify the results in pilot-scale and the full technical-scale studies. This study summarizes the strengths and weaknesses of microalgal biomass production technologies for bioenergetic applications.
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Fawzy MA. Biosorption of copper ions from aqueous solution by Codium vermilara: Optimization, kinetic, isotherm and thermodynamic studies. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.07.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Fawzy MA, Gomaa M. Use of algal biorefinery waste and waste office paper in the development of xerogels: A low cost and eco-friendly biosorbent for the effective removal of congo red and Fe (II) from aqueous solutions. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 262:110380. [PMID: 32250831 DOI: 10.1016/j.jenvman.2020.110380] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 02/24/2020] [Accepted: 03/01/2020] [Indexed: 06/11/2023]
Abstract
The present study investigated the use of algae biorefinery waste and wastepaper in the preparation of cost-effective and eco-friendly xerogels for the removal of congo red (CR) and Fe2+. The xerogel properties such as density, swelling degree and porosity were modified by incorporating alginate extracted from the brown seaweed Cystoseira trinodis. The developed biosorbents exhibited a light and porous network structure and were characterized by a fast uptake of CR and Fe2+ and adsorption efficiency was increased at pH 6-8. The equilibrium adsorption capacity was found to be 6.20-7.28 mg CR g-1 biosorbent and 8.08-8.39 mg Fe2+ g-1 biosorbent using different xerogels. The adsorption of CR obeyed first-order kinetics, while, Fe2+ followed second-order kinetics. Intraparticle diffusion model suggested a boundary layer effect. The adsorption capacity was maximally obtained as 41.15 mg g-1 and 169.49 mg g-1 for CR and Fe2+ using wastepaper/Spirulina and wastepaper/alginate/Spirulina xerogel, respectively. Temkin isotherm fitted better to the equilibrium data of CR adsorption than Langmuir and Freundlich models. While, equilibrium data of Fe2+ exhibited a best fit to both Langmuir and Freundlich models. Additionally, the Dubinin-Radushkevich isotherm suggested that adsorption mechanism of CR or Fe2+ is predominately physisorption. Investigation of thermodynamic parameters such as ΔH° and ΔS° and ΔG° confirmed the feasibility, spontaneity, randomness and endothermic nature of the adsorption process. Electrostatic attraction, H-bonding and n-π interactions were mainly involved in the biosorption process of CR. The results of this study showed that the developed xerogels could be effectively applied for dye and heavy metal removal at low concentrations.
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Affiliation(s)
- Mustafa A Fawzy
- Biology Department, Faculty of Science, Taif University, 21974, Taif, Saudi Arabia; Botany & Microbiology Department, Faculty of Science, Assiut University, 71516, Assiut, Egypt
| | - Mohamed Gomaa
- Botany & Microbiology Department, Faculty of Science, Assiut University, 71516, Assiut, Egypt.
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Sabu S, Singh ISB, Joseph V. Optimisation of critical medium components and culture conditions for enhanced biomass and lipid production in the oleaginous diatom Navicula phyllepta: a statistical approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:26763-26777. [PMID: 28963632 DOI: 10.1007/s11356-017-0274-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Accepted: 09/19/2017] [Indexed: 06/07/2023]
Abstract
Diatoms hold great promise as potential sources of biofuel production. In the present study, the biomass and lipid production in the marine diatom Navicula phyllepta, isolated from Cochin estuary, India and identified as a potential biodiesel feedstock, were optimized using Plackett-Burman (PB) statistical experimental design followed by central composite design (CCD) and response surface methodology (RSM). The growth analyses of the isolate in different nitrogen sources, salinities and five different enriched sea water media showed the best growth in the cheapest medium with minimum components using urea as nitrogen source at salinity between 25 and 40 g kg-1. Plackett-Burman experimental analyses for screening urea, sodium metasilicate, sodium dihydrogen phosphate, ferric chloride, salinity, temperature, pH and agitation influencing lipid and biomass production showed that silicate and temperature had a positive coefficient on biomass production, and temperature had a significant positive coefficient, while urea and phosphate showed a negative coefficient on lipid content. A 24 factorial central composite design (FCCD) was used to optimize the concentration of the factors selected. The optimized media resulted in 1.62-fold increase (64%) in biomass (1.2 ± 0.08 g L-1) and 1.2-fold increase (22%) in estimated total lipid production (0.11 ± 0.003 g L-1) compared to original media within 12 days of culturing. A significantly higher biomass and lipid production in the optimized medium demands further development of a two-stage strategy of biomass production followed by induction of high lipid production under nutrient limitation or varying culture conditions for large-scale production of biodiesel from the marine diatom.
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Affiliation(s)
- Sanyo Sabu
- National Centre for Aquatic Animal Health, Cochin University of Science and Technology, Kochi, Kerala, 682016, India
| | - Isaac Sarojini Bright Singh
- National Centre for Aquatic Animal Health, Cochin University of Science and Technology, Kochi, Kerala, 682016, India
| | - Valsamma Joseph
- National Centre for Aquatic Animal Health, Cochin University of Science and Technology, Kochi, Kerala, 682016, India.
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Changing Trends in Microalgal Energy Production- Review of Conventional and Emerging Approaches. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2017. [DOI: 10.22207/jpam.11.2.42] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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