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Scapini T, Woiciechowski AL, Manzoki MC, Molina-Aulestia DT, Martinez-Burgos WJ, Fanka LS, Duda LJ, Vale ADS, de Carvalho JC, Soccol CR. Microalgae-mediated biofixation as an innovative technology for flue gases towards carbon neutrality: A comprehensive review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 363:121329. [PMID: 38852420 DOI: 10.1016/j.jenvman.2024.121329] [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: 02/07/2024] [Revised: 05/18/2024] [Accepted: 05/30/2024] [Indexed: 06/11/2024]
Abstract
Microalgae-mediated industrial flue gas biofixation has been widely discussed as a clean alternative for greenhouse gas mitigation. Through photosynthetic processes, microalgae can fix carbon dioxide (CO2) and other compounds and can also be exploited to obtain high value-added products in a circular economy. One of the major limitations of this bioprocess is the high concentrations of CO2, sulfur oxides (SOx), and nitrogen oxides (NOx) in flue gases, according to the origin of the fuel, that can inhibit photosynthesis and reduce the process efficiency. To overcome these limitations, researchers have recently developed new technologies and enhanced process configurations, thereby increased productivity and CO2 removal rates. Overall, CO2 biofixation rates from flue gases by microalgae ranged from 72 mg L-1 d -1 to over 435 mg L-1 d-1, which were directly influenced by different factors, mainly the microalgae species and photobioreactor. Additionally, mixotrophic culture have shown potential in improving microalgae productivity. Progress in developing new reactor configurations, with pilot-scale implementations was observed, resulting in an increase in patents related to the subject and in the implementation of companies using combustion gases in microalgae culture. Advancements in microalgae-based green technologies for environmental impact mitigation have led to more efficient biotechnological processes and opened large-scale possibilities.
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Affiliation(s)
- Thamarys Scapini
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil
| | - Adenise Lorenci Woiciechowski
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil.
| | - Maria Clara Manzoki
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil
| | - Denisse Tatiana Molina-Aulestia
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil
| | - Walter Jose Martinez-Burgos
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil
| | - Letícia Schneider Fanka
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil
| | - Leonardo José Duda
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil
| | - Alexander da Silva Vale
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil
| | - Julio Cesar de Carvalho
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil
| | - Carlos Ricardo Soccol
- Department of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Centro Politécnico, CP 19011, Curitiba, PR, 81531-908, Brazil
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Udaypal, Goswami RK, Mehariya S, Verma P. Advances in microalgae-based carbon sequestration: Current status and future perspectives. ENVIRONMENTAL RESEARCH 2024; 249:118397. [PMID: 38309563 DOI: 10.1016/j.envres.2024.118397] [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: 11/14/2023] [Revised: 01/02/2024] [Accepted: 01/30/2024] [Indexed: 02/05/2024]
Abstract
The advancement in carbon dioxide (CO2) sequestration technology has received significant attention due to the adverse effects of CO2 on climate. The mitigation of the adverse effects of CO2 can be accomplished through its conversion into useful products or renewable fuels. In this regard, microalgae is a promising candidate due to its high photosynthesis efficiency, sustainability, and eco-friendly nature. Microalgae utilizes CO2 in the process of photosynthesis and generates biomass that can be utilized to produce various valuable products such as supplements, chemicals, cosmetics, biofuels, and other value-added products. However, at present microalgae cultivation is still restricted to producing value-added products due to high cultivation costs and lower CO2 sequestration efficiency of algal strains. Therefore, it is very crucial to develop novel techniques that can be cost-effective and enhance microalgal carbon sequestration efficiency. The main aim of the present manuscript is to explain how to optimize microalgal CO2 sequestration, integrate valuable product generation, and explore novel techniques like genetic manipulations, phytohormones, quantum dots, and AI tools to enhance the efficiency of CO2 sequestration. Additionally, this review provides an overview of the mass flow of different microalgae and their biorefinery, life cycle assessment (LCA) for achieving net-zero CO2 emissions, and the advantages, challenges, and future perspectives of current technologies. All of the reviewed approaches efficiently enhance microalgal CO2 sequestration and integrate value-added compound production, creating a green and economically profitable process.
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Affiliation(s)
- Udaypal
- Bioprocess and Bioenergy Laboratory (BPBEL), Department of Microbiology, Central University of Rajasthan, Bandarsindri, Kishangarh, Ajmer, Rajasthan, 305817, India
| | - Rahul Kumar Goswami
- Bioprocess and Bioenergy Laboratory (BPBEL), Department of Microbiology, Central University of Rajasthan, Bandarsindri, Kishangarh, Ajmer, Rajasthan, 305817, India
| | - Sanjeet Mehariya
- Algal Technology Program, Center for Sustainable Development, College of Arts and Sciences, Qatar University, Doha, 2713, Qatar
| | - Pradeep Verma
- Bioprocess and Bioenergy Laboratory (BPBEL), Department of Microbiology, Central University of Rajasthan, Bandarsindri, Kishangarh, Ajmer, Rajasthan, 305817, India.
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Zhao S, Feng W, Li J, Zhang X, Liu L, Li H. Effects of bubble cutting dynamic behaviors on microalgal growth in bubble column photobioreactor with a novel aeration device. Front Bioeng Biotechnol 2023; 11:1225187. [PMID: 37449087 PMCID: PMC10336540 DOI: 10.3389/fbioe.2023.1225187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 06/19/2023] [Indexed: 07/18/2023] Open
Abstract
Introduction: Carbon sequestration by microalgae is an effective approach for achieving carbon neutrality owing to its high carbon capture efficiency and environmental friendliness. To improve microalgae CO2 fixation efficiency, various methods to enhance CO2 transfer at the gas-liquid interface have resulted in high energy consumption. Methods: In this study, a novel aeration device with bubble cutting slices was installed in a photobioreactor for CO2 supply, which could precisely separate bubbles into sizes on the way to rising after departure, achieving CO2 transfer enhancement without extra energy consumption. Subsequently, the bubble cutting dynamic behaviors in the photobioreactor were studied, and the effects of thickness, hydrophilicity, and arrangement of cutting slices on microalgal growth were analyzed. Results: It was found that bubble cutting caused the maximum dry weight and biomass productivity of microalgae to improve by 6.99% and 33.33%, respectively, compared with those of the bioreactor without cutting units, owing to a 27.97% and 46.88% decrease in bubble size and rising velocity, respectively, and an 84.55% prolongation of bubble residence time. Discussion: Parallel cut slices with a thickness and spacing of less than 3 mm successfully cut the bubbles. The hydrophobic slice surface prevented daughter bubble departure and prolonged the bubble residence time, impeding microalgae growth owing to bubble coalescence with subsequent bubbles. The optimal cutting slice parameters and culture conditions for microalgal growth were 1 mm slice thickness, less than 1 mm slice spacing, 5% inlet CO2 concentration, and 70 mL/min gas flow rate.
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Kumar S, Jia D, Kubar AA, Zou X, Huang Z, Rao M, Kuang C, Ye J, Chen C, Chu F, Cheng J. Butterfly Baffle-Enhanced Solution Mixing and Mass Transfer for Improved Microalgal Growth in Double-Column Photobioreactor. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Santosh Kumar
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Dongwei Jia
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Ameer Ali Kubar
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Xiangbo Zou
- Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
| | - Zhimin Huang
- Guangdong Yudean Zhanjiang Biomass Power Co., Ltd., Zhanjiang 524300, China
| | - Mumin Rao
- Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
| | - Cao Kuang
- Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
| | - Ji Ye
- Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
| | - Chuangting Chen
- Guangdong Energy Group Science and Technology Research Institute Co., Ltd., Guangzhou 510630, China
| | - Feifei Chu
- College of Standardization, China Jiliang University, Hangzhou 310018, China
| | - Jun Cheng
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Tang J, Zhang Y, Yao Y, Dai N, Ge Z, Wu D. High-Performance Ultrafine Bubble Aeration on Janus Aluminum Foil Prepared by Laser Microfabrication. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:6947-6952. [PMID: 34060840 DOI: 10.1021/acs.langmuir.1c00437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Aeration is a mass transfer process, in which gas is dispersed into a liquid by utilizing air inflation or agitation. Typically, a microporous device is often used for aeration. Increasing the gas flow rate and decreasing the pore size reduce the bubble size, but the surface wettability of the gas/solid interface also has a significant impact on the bubble size, which is rarely studied. In this study, a superhydrophilic/superhydrophobic Janus aluminum foil (JAF) is fabricated by laser microstructuring and low surface energy modification. The gas-repelling superhydrophilic surface not only facilitates ultrafine bubble generation but also allows the bubbles to detach from the aerator surface quickly, while the superhydrophobic surface prevents water from infiltrating into the aeration chamber and reduces the mass transfer resistance. The micropores with different diameters are obtained by adjusting the laser processing parameters. The pore prepared by the laser is uniform, consequently leading to the uniform bubble size. When the pore diameter is set to 30 μm, the diameter of bubbles released from the superhydrophilic surface of the JAF is only 0.326 mm, and the gas dissolution rate is about six times that of the double-sided superhydrophobic aluminum foil. This simple, low-cost, and controllable method of the laser processing JAF has broad applications in wastewater treatment, energy production, and aquaculture.
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Affiliation(s)
- Jianping Tang
- School of Mechanical and Electrical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China
| | - Yachao Zhang
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yansheng Yao
- School of Mechanical and Electrical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China
- Key Laboratory of Intelligent Manufacturing of Construction Machinery, Hefei, Anhui 230601, China
| | - Nianwei Dai
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Zhangsen Ge
- School of Mechanical and Electrical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China
| | - Dong Wu
- CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230026, China
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Fu J, Huang Y, Liao Q, Xia A, Fu Q, Zhu X. Photo-bioreactor design for microalgae: A review from the aspect of CO 2 transfer and conversion. BIORESOURCE TECHNOLOGY 2019; 292:121947. [PMID: 31466821 DOI: 10.1016/j.biortech.2019.121947] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 07/30/2019] [Accepted: 07/31/2019] [Indexed: 06/10/2023]
Abstract
Photobioreactor (PBR) is the most critical equipment for microalgal photosynthetic fixation of CO2. It provides suitable environmental conditions, such as CO2, light and nutrients, for microalgal growth. As the major carbon source for microalgae, CO2 gas is pumped into PBR with the formation of bubbles and formed gas-liquid flow. The gas-liquid flow affects CO2 and nutrients transmission as well as microalgae cells distribution in PBR, thereby affecting the biochemical reaction of microalgae. While the migration and transport of biochemical reaction products affect the two-phase flow, phase distribution and flow resistance in the PBR in return, thus affecting the transport of light and nutrients. Therefore, microalgal photosynthetic rate is determined synthetically by two-phase flow and the transport of CO2, light and nutrients in PBR. Deep understanding of gas-liquid two-phase flow, energy and mass transfer coupling with microalgal growth in PBR is the cornerstone for the design of an efficient microalgae PBR.
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Affiliation(s)
- Jingwei Fu
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Yun Huang
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Qiang Liao
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
| | - Ao Xia
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Qian Fu
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
| | - Xun Zhu
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
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Kumar S, Cheng J, Guo W, Ali KA, Song Y. Self-rotary propellers with clockwise/counterclockwise blades create spiral flow fields to improve mass transfer and promote microalgae growth. BIORESOURCE TECHNOLOGY 2019; 286:121384. [PMID: 31048263 DOI: 10.1016/j.biortech.2019.121384] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Revised: 04/24/2019] [Accepted: 04/25/2019] [Indexed: 06/09/2023]
Abstract
In this work, self-rotary propellers (SRPs) with clockwise/counterclockwise blades were investigated to create spiral flow fields without external power to strengthen gas-liquid mixing and promote microalgal growth in an open raceway pond. The rotational flow around the propellers and spiral flow between the propellers generated extensive wall shear stress in three dimensions. Four-clockwise blades on the propellers exerted better mixing than three-counterclockwise blades. The bubble generation diameter was reduced by 69% and the mass transfer coefficient increased by 49% when the propeller diameter was increased from 32 to 60 mm. The photochemical efficiency (φPSII) of Arthrospira platensis cells was enhanced by 25%, while the helix pitch and trichome lengths were enlarged by 7-16%. Self-rotary propellers (60 mm diameter) with four-clockwise blades enhanced the growth rate of A. platensis biomass by 35% compared to that in an unmodified raceway pond without propellers.
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Affiliation(s)
- Santosh Kumar
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Jun Cheng
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
| | - Wangbiao Guo
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Kubar Ameer Ali
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Yanmei Song
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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8
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Cheng J, Song Y, Guo W, Miao Y, Chen S, Zhou J. Developing microporous fibrous-diaphragm aerator to decrease bubble generation diameter for improving microalgal growth with CO 2 fixation in a raceway pond. BIORESOURCE TECHNOLOGY 2019; 276:28-34. [PMID: 30605836 DOI: 10.1016/j.biortech.2018.12.090] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 12/19/2018] [Accepted: 12/25/2018] [Indexed: 06/09/2023]
Abstract
A novel microporous fibrous-diaphragm aerator (FDA) was proposed to generate pressurized gas with check valve to penetrate through millions of micropores (6-126 μm) of expanded fibrous diaphragm on internal support, thus decreasing bubble generation diameter and increasing bubble residence time for improving microalgal growth with CO2 fixation in a raceway pond. When installation angle of FDA internal support increased from 0° to 45°, bubble generation time and diameter first decreased (to valley bottoms of 4 ms and 0.45 mm at 22°) and then increased. Compared to traditional strip aerator, bubble generation time and diameter decreased by 50% and 60% through FDA with support installation angle of 22° and average pore diameter of 28 µm, while gas-solution mixing time decreased by 22% and mass transfer coefficient increased by 40%, leading to increased actual photochemical efficiency (by 80%) and increased biomass yield (by 38.5%) of Arthrospira cells with pure CO2 aeration through FDA.
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Affiliation(s)
- Jun Cheng
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
| | - Yanmei Song
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Wangbiao Guo
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Yi Miao
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Shutong Chen
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Junhu Zhou
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Ramírez-López C, Perales-Vela HV, Fernández-Linares L. Biomass and lipid production from Chlorella vulgaris UTEX 26 cultivated in 2 m 3 raceway ponds under semicontinuous mode during the spring season. BIORESOURCE TECHNOLOGY 2019; 274:252-260. [PMID: 30529329 DOI: 10.1016/j.biortech.2018.11.096] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 11/26/2018] [Accepted: 11/27/2018] [Indexed: 06/09/2023]
Abstract
A Chlorella vulgaris UTEX 26 semicontinuous culture was implemented in 2000 L raceways with M medium during spring season at greenhouse conditions. Areal biomass productivities between 20 and 26 g m-2 d-1 were reached on the third day. The maximal areal lipid productivity obtained was 6.1 g m-2 d-1 and an increment in the saturated fatty acids (SFA) proportion (C14-C18) was favored in comparison with the fatty acids obtained with M medium in photobioreactors of 1 L and photoperiod light:darkness 12:12 h. After the eighth day of the culture or biomass concentrations above 0.25 g L-1, the microalgal cultures were prone to contamination by ciliates and amoebae, due to the sugars excreted by C. vulgaris UTEX 26. The periodical addition of NH4HCO3 to the microalgal culture maintained the ammonium concentration between 25 and 50 mg L-1, which contributed to diminish the contamination risks by protozoa.
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Affiliation(s)
- Citlally Ramírez-López
- Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, Av. Acueducto S/N, Col. Barrio La Laguna Ticomán, 07340 Ciudad de México, Mexico
| | - Hugo Virgilio Perales-Vela
- Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Av. de los Barrios 1, Col. Barrio de los Árboles/Barrio de los Héroes, 54090 Tlalnepantla, Estado de México, Mexico
| | - Luis Fernández-Linares
- Unidad Profesional Interdisciplinaria de Biotecnología, Instituto Politécnico Nacional, Av. Acueducto S/N, Col. Barrio La Laguna Ticomán, 07340 Ciudad de México, Mexico.
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Cheng J, Miao Y, Guo W, Song Y, Tian J, Zhou J. Reduced generation time and size of carbon dioxide bubbles in a volute aerator for improving Spirulina sp. growth. BIORESOURCE TECHNOLOGY 2018; 270:352-358. [PMID: 30243242 DOI: 10.1016/j.biortech.2018.09.067] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 09/11/2018] [Accepted: 09/12/2018] [Indexed: 06/08/2023]
Abstract
A novel volute aerator was proposed to generate shear force and break gas flow through water centrifugation to promote mass transfer for CO2 fixation with microalgae. The bubble evolution and gas-liquid mixing processes in volute aerator were numerically simulated. The bubble generation time and diameter were measured on a high-speed camera and assessed with level-set method. By optimizing gas inletpipe angle and water/gas inlet velocities of volute aerator, the bubble generation time decreased by 60.1% to 3.3 ms and outlet bubble diameter decreased by 50.7% to 1.8 mm, compared with traditional strip aerator. The corresponding gas-liquid mixing time reduced by 15.6% and mass transfer coefficient increased by 42.2%. The volute aerator was used as an alternative to traditional strip aerator to culture microalgae under high-purity CO2 condition, which promoted average growth rate and biomass production by 26.6% and 50.7%, respectively.
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Affiliation(s)
- Jun Cheng
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
| | - Yi Miao
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Wangbiao Guo
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Yanmei Song
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Jianglei Tian
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Junhu Zhou
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Kuo CM, Jian JF, Sun YL, Lin TH, Yang YC, Zhang WX, Chang HF, Lai JT, Chang JS, Lin CS. An efficient Photobioreactors/Raceway circulating system combined with alkaline-CO 2 capturing medium for microalgal cultivation. BIORESOURCE TECHNOLOGY 2018; 266:398-406. [PMID: 29982063 DOI: 10.1016/j.biortech.2018.06.090] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 06/20/2018] [Accepted: 06/21/2018] [Indexed: 06/08/2023]
Abstract
High efficiency of microalgal growth and CO2 fixation in a Photobioreactors (PBRs)/Raceway circulating (PsRC) system combined with alkaline-CO2 capturing medium and operation was established and investigated. Compared with a pH 6 medium, the average biomass productivity of Chlorella sp. AT1 cultured in a pH 11 medium at 2 L min-1 circulation rate for 7 days increased by about 2-fold to 0.346 g L-1 d-1. The maximum amount of CO2 fixation and CO2 utilization efficiency of Chlorella sp. AT1 could be obtained at a PBRs to Raceway ratio of 1:10 in an indoor-simulated PsRC system. A similar result was also shown in an outdoor PsRC system with a 10-ton scale for microalgal cultivation. Under the appropriate circulation rate, the stable growth performance of Chlorella sp. AT1 cultured by long-term semi-continuous operation in the 10-ton outdoor PsRC system was observed, and the total amount of CO2 fixation was approximately 1.2 kg d-1 with 50% CO2 utilization efficiency.
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Affiliation(s)
- Chiu-Mei Kuo
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan; Bioresource Collection and Research Center, Food Industry Research and Development Institute, Hsinchu, Taiwan
| | - Jhong-Fu Jian
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
| | - Yu-Ling Sun
- Aquatic Technology Laboratories, Agricultural Technology Research Institute, Hsinchu, Taiwan
| | - Tsung-Hsien Lin
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
| | - Yi-Chun Yang
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
| | - Wen-Xin Zhang
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
| | - Hui-Fang Chang
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan
| | - Jinn-Tsyy Lai
- Bioresource Collection and Research Center, Food Industry Research and Development Institute, Hsinchu, Taiwan
| | - Jo-Shu Chang
- Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan; Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan, Taiwan
| | - Chih-Sheng Lin
- Department of Biological Science and Technology, National Chiao Tung University, Hsinchu, Taiwan.
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12
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Cheng J, Yang Z, Zhou J, Cen K. Improving the CO2 fixation rate by increasing flow rate of the flue gas from microalgae in a raceway pond. KOREAN J CHEM ENG 2017. [DOI: 10.1007/s11814-017-0300-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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