1
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Han SF, Jin W, Qu F, Hanelt D, Abomohra A. Integrated municipal wastewater treatment and lipid accumulation by a self-flocculating/floating microalga Limnothrix sp. BIORESOURCE TECHNOLOGY 2024; 394:130165. [PMID: 38072079 DOI: 10.1016/j.biortech.2023.130165] [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: 11/13/2023] [Revised: 12/05/2023] [Accepted: 12/05/2023] [Indexed: 02/04/2024]
Abstract
The present study evaluated the growth, self-flocculation, lipid content, and pollutants removal by Limnothrix sp. BASMWW-9 isolated from municipal wastewater treatment system and cultivated in municipal wastewater. The biomass yield and lipid content after 6 days of cultivation were 1.07 g dw/L and 27.34 %dw, respectively. In addition, its self-flocculating ability reached up to 90 % after harvesting time of 180 min. Moreover, COD,NH3-N, TN, and TP removalefficiencies were 71.65 %, 81.89 %, 74.64 %, and 80.16 %, respectively. The self-flocculation performance of Limnothrix sp. was greatly associated to its morphology and production of extracellular polymeric substances (EPS), with significant positive impact of the high calcium and magnesium content in municipal wastewater. Interestingly, blue light irradiation during harvest enhanced the aggregation and floc formation as a floating biomat, which was attributed to enhanced polysaccharides production. This study provides innovative harvest method for Limnothrix sp. BASMWW-9 cultivated in wastewater using blue light for enhanced lipid recovery.
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Affiliation(s)
- Song-Fang Han
- School of Chemistry and Chemical Engineering, Zhoukou Normal University, Zhoukou 466001, China
| | - Wenbiao Jin
- Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Fanqi Qu
- Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Dieter Hanelt
- Aquatic Ecophysiology and Phycology, Institute of Plant Science and Microbiology, University of Hamburg, Hamburg 22609, Germany
| | - Abdelfatah Abomohra
- Aquatic Ecophysiology and Phycology, Institute of Plant Science and Microbiology, University of Hamburg, Hamburg 22609, Germany.
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2
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Lin YS, Sun CL, Tsang S, Bensalem S, Le Pioufle B, Wang HY. Label-free and noninvasive analysis of microorganism surface epistructures at the single-cell level. Biophys J 2023; 122:1794-1806. [PMID: 37041747 PMCID: PMC10209039 DOI: 10.1016/j.bpj.2023.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 11/10/2022] [Accepted: 04/07/2023] [Indexed: 04/13/2023] Open
Abstract
Cell surface properties of microorganisms provide abundant information for their physiological status and fate choice. However, current methods for analyzing cell surface properties require labeling or fixation, which can alter the cell activity. This study establishes a label-free, rapid, noninvasive, and quantitative analysis of cell surface properties, including the presence and the dimension of epistructure, down to the single-cell level and at the nanometer scale. Simultaneously, electrorotation provides dielectric properties of intracellular contents. With the combined information, the growth phase of microalgae cells can be identified. The measurement is based on electrorotation of single cells, and an electrorotation model accounting for the surface properties is developed to properly interpret experimental data. The epistructure length measured by electrorotation is validated by scanning electron microscopy. The measurement accuracy is satisfactory in particular in the case of microscale epistructures in the exponential phase and nanoscale epistructures in the stationary phase. However, the measurement accuracy for nanoscale epistructures on cells in the exponential phase is offset by the effect of a thick double layer. Lastly, a diversity in epistructure length distinguishes exponential phase from stationary phase.
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Affiliation(s)
- Yu-Sheng Lin
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan; Université Paris Saclay, ENS Paris Saclay, CNRS Institut d'Alembert, SATIE, Gif sur Yvette, France
| | - Chen-Li Sun
- Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
| | - Sung Tsang
- Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan
| | - Sakina Bensalem
- Université Paris Saclay, ENS Paris Saclay, CNRS Institut d'Alembert, LUMIN, Gif sur Yvette, France
| | - Bruno Le Pioufle
- Université Paris Saclay, ENS Paris Saclay, CNRS Institut d'Alembert, LUMIN, Gif sur Yvette, France
| | - Hsiang-Yu Wang
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan.
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3
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Li H, Liu J, Jia C, Feng J, Liu X, Xie S, Lv J. Role of extracellular polymeric substance in flocculation of Chlorococcum sphacosum cultivated with different initial inoculum concentrations in municipal wastewater. ALGAL RES 2023. [DOI: 10.1016/j.algal.2022.102966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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4
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Malik S, Ashraf MUF, Shahid A, Javed MR, Khan AZ, Usman M, Manivannan A, Mehmood MA, Ashraf GA. Characterization of a newly isolated self-flocculating microalga Bracteacoccus pseudominor BERC09 and its evaluation as a candidate for a multiproduct algal biorefinery. CHEMOSPHERE 2022; 304:135346. [PMID: 35714954 DOI: 10.1016/j.chemosphere.2022.135346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 05/29/2022] [Accepted: 06/12/2022] [Indexed: 06/15/2023]
Abstract
Microalgae have the highest capability to fix the atmospheric carbon and wastewater-derived nutrients to produce high-value bioproducts including lipids and carotenoids. However, their lower titers and single-product-oriented biomass processing have made the overall process expensive. Hence, increased metabolite titer and processing of the biomass for more than one product are required to ensure the commercial robustness of the algal biorefinery. In this study, a newly isolated algal strain was identified as Bracteacoccus pseudominor BERC09 through phylogenetic analysis based on the 18S rRNA gene sequence. Basic characterization of the strain revealed its promising potential to produce carotenoids and lipids. The lipids and carotenoid biosynthesis pathways of BERC09 were further triggered by manipulating the abiotic factors including nitrogen sources (NaNO3, KNO3, NH4Cl, Urea), nitrogen concentrations (0.06-0.36 gL-1), light intensity (150 μmolm-2s-1 to 300 μmolm-2s-1), and light quality (white and blue). Resultantly, 300 μmolm-2s-1 of blue light yielded 0.768 gL-1 of biomass, 8.4 mgg-1 of carotenoids, and 390 mgg-1 of lipids, and supplementation of 0.36 gL-1 of KNO3 further improved metabolism and yielded 0.814 gL-1 of biomass, 11.86 mgg-1 of carotenoids, and 424 mgg-1 of lipids. Overall, the optimal combination of light and nitrogen concurrently improved biomass, carotenoids, and lipids by 3.5-fold, 6-fold, and 4-fold than control, respectively. Besides, the excellent glycoproteins-based self-flocculation ability of the strain rendered an easier harvesting via gravity sedimentation. Hence, this biomass can be processed in a cascading fashion to use this strain as a candidate for a multiproduct biorefinery to achieve commercial robustness and environmental sustainability.
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Affiliation(s)
- Sana Malik
- Department of Bioinformatics & Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Muhammad Umer Farooq Ashraf
- Department of Bioinformatics & Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Ayesha Shahid
- Department of Bioinformatics & Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Muhammad Rizwan Javed
- Department of Bioinformatics & Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan
| | - Aqib Zafar Khan
- State Key Laboratory of Microbial Metabolism, Joint International Research Laboratory of Metabolic & Developmental Sciences, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Muhammad Usman
- School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, China
| | - Arthi Manivannan
- Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Chennai, India
| | - Muhammad Aamer Mehmood
- Department of Bioinformatics & Biotechnology, Government College University Faisalabad, Faisalabad, Pakistan.
| | - Ghulam Abbas Ashraf
- Department of Physics, Zhejiang Normal University, Zhejiang, 321004, Jinhua, China.
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5
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Peter AP, Chew KW, Koyande AK, Munawaroh HSH, Bhatnagar A, Tao Y, Sun C, Sun F, Ma Z, Show PL. Integrated microalgae culture with food processing waste for wastewater remediation and enhanced biomass productivity. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.08.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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6
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Wang H, Deng L, Qi Z, Wang W. Constructed microalgal-bacterial symbiotic (MBS) system: Classification, performance, partnerships and perspectives. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 803:150082. [PMID: 34525774 DOI: 10.1016/j.scitotenv.2021.150082] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 08/27/2021] [Accepted: 08/29/2021] [Indexed: 06/13/2023]
Abstract
The microalgal-bacterial symbiotic (MBS) system shows great advantages in the synchronous implementation of wastewater treatment and nutrient recovery. To enhance the understanding of different MBS systems, this review summarizes reported MBS systems and proposes three patterns according to the living state of microalgae and bacteria. They are free microalgal-bacterial (FMB) system, attached microalgal-bacterial (AMB) system and bioflocculated microalgal-bacterial (BMB) system. Compared with the other two patterns, BMB system shows the advantages of microalgal biomass harvesting and application. To further understand the microalgal-bacterial partnerships in the bioflocculation of BMB system, this review discusses bioflocs characteristics, extracellular polymeric substances (EPS) properties and production, and the effect of microalgae/bacteria ratio and microalgal strains on the formation of bioflocculation. Microalgal biomass production and application are important for BMB system development in the future. Food processing wastewater characterized by high biodegradability and low toxicity should be conducive for microalgal cultivation. In addition, exogenous addition of functional bacteria for nutrient removal and bioflocculation formation would be a crucial research direction to facilitate the large-scale application of BMB system.
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Affiliation(s)
- Hong Wang
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu 610213, China; Chengdu National Agricultural Science and Technology Center, Chengdu 610213, China
| | - Liangwei Deng
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China; Chengdu National Agricultural Science and Technology Center, Chengdu 610213, China
| | - Zhiyong Qi
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu 610213, China; Chengdu National Agricultural Science and Technology Center, Chengdu 610213, China
| | - Wenguo Wang
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China; Chengdu National Agricultural Science and Technology Center, Chengdu 610213, China.
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7
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Wang Y, Tibbetts SM, McGinn PJ. Microalgae as Sources of High-Quality Protein for Human Food and Protein Supplements. Foods 2021; 10:3002. [PMID: 34945551 PMCID: PMC8700990 DOI: 10.3390/foods10123002] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/19/2021] [Accepted: 11/29/2021] [Indexed: 02/07/2023] Open
Abstract
As a result of population growth, an emerging middle-class, and a more health-conscious society concerned with overconsumption of fats and carbohydrates, dietary protein intake is on the rise. To address this rapid change in the food market, and the subsequent high demand for protein products, agriculture, aquaculture, and the food industry have been working actively in recent years to increase protein product output from both production and processing aspects. Dietary proteins derived from animal sources are of the highest quality, containing well-balanced profiles of essential amino acids that generally exceed those of other food sources. However, as a result of studies highlighting low production efficiency (e.g., feed to food conversion) and significant environmental impacts, together with the negative health impacts associated with the dietary intake of some animal products, especially red meats, the consumption of animal proteins has been remaining steady or even declining over the past few decades. To fill this gap, researchers and product development specialists at all levels have been working closely to discover new sources of protein, such as plant-based ingredients. In this regard, microalgae have been recognized as strategic crops, which, due to their vast biological diversity, have distinctive phenotypic traits and interactions with the environment in the production of biomass and protein, offering possibilities of production of large quantities of microalgal protein through manipulating growing systems and conditions and bioengineering technologies. Despite this, microalgae remain underexploited crops and research into their nutritional values and health benefits is in its infancy. In fact, only a small handful of microalgal species are being produced at a commercial scale for use as human food or protein supplements. This review is intended to provide an overview on microalgal protein content, its impact by environmental factors, its protein quality, and its associated evaluation methods. We also attempt to present the current challenges and future research directions, with a hope to enhance the research, product development, and commercialization, and ultimately meet the rapidly increasing market demand for high-quality protein products.
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Affiliation(s)
- Yanwen Wang
- Aquatic and Crop Resource Development Research Centre, National Research Council of Canada, 550 University Avenue, Charlottetown, PE C1A 4P3, Canada
| | - Sean M. Tibbetts
- Aquatic and Crop Resource Development Research Centre, National Research Council of Canada, 1411 Oxford Street, Halifax, NS B3H 3Z1, Canada; (S.M.T.); (P.J.M.)
| | - Patrick J. McGinn
- Aquatic and Crop Resource Development Research Centre, National Research Council of Canada, 1411 Oxford Street, Halifax, NS B3H 3Z1, Canada; (S.M.T.); (P.J.M.)
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8
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Xu K, Zou X, Chang W, Qu Y, Li Y. Microalgae harvesting technique using ballasted flotation: A review. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119439] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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9
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Shaikh SM, Hassan MK, Nasser M, Sayadi S, Ayesh AI, Vasagar V. A comprehensive review on harvesting of microalgae using Polyacrylamide-Based Flocculants: Potentials and challenges. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119508] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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10
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Vu HP, Nguyen LN, Emmerton B, Wang Q, Ralph PJ, Nghiem LD. Factors governing microalgae harvesting efficiency by flocculation using cationic polymers. BIORESOURCE TECHNOLOGY 2021; 340:125669. [PMID: 34339996 DOI: 10.1016/j.biortech.2021.125669] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 07/21/2021] [Accepted: 07/24/2021] [Indexed: 06/13/2023]
Abstract
This study aims to elucidate the mechanisms governing the harvesting efficiency of Chlorella vulgaris by flocculation using a cationic polymer. Flocculation efficiency increased as microalgae culture matured (i.e. 35-45, 75, and > 97% efficiency at early, late exponential, and stationary phase, respectively. Unlike the negative impact of phosphate on flocculation in traditional wastewater treatment; here, phosphorous residue did not influence the flocculation efficiency of C. vulgaris. The observed dependency of flocculation efficiency on growth phase was driven by changes in microalgal cell properties. Microalgal extracellular polymeric substances (EPS) in both bound and free forms at stationary phase were two and three times higher than those at late and early exponential phase, respectively. Microalgae cells also became more negatively charged as they matured. Negatively charged and high EPS content together with the addition of high molecular weight and positively charged polymer could facilitate effective flocculation via charge neutralisation and bridging.
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Affiliation(s)
- Hang P Vu
- Center for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Luong N Nguyen
- Center for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Benjamin Emmerton
- Climate Change Cluster, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Qilin Wang
- Center for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Peter J Ralph
- Climate Change Cluster, Faculty of Science, University of Technology Sydney, Sydney, NSW 2007, Australia
| | - Long D Nghiem
- Center for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia.
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11
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Abstract
The development of clean and renewable biofuels has been of wide concern on the topic of energy and environmental issues. As a kind of biomass energy with great application prospects, microalgae have many advantages and are used in the fields of environmental protection and biofuels as well as food or feed production for humans and animals. However, the high cost of microalgae harvesting is the main bottleneck of industrial production on a large scale. Self-flocculation is a cost-efficient and promising method for harvesting microalgal biomass. This article briefly describes the current commonly used technology for microalgae harvesting, focusing on the research progress of self-flocculation. This article explores the relative mechanisms and influencing factors of self-flocculation and discusses a proposal for the integration of algae cultivation and harvesting as well as the co-cultivation of algae and bacteria in an effort to provide a reference for microalgae harvesting with high efficiency and low cost.
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12
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de Lima Barizão AC, de Oliveira JP, Gonçalves RF, Cassini ST. Nanomagnetic approach applied to microalgae biomass harvesting: advances, gaps, and perspectives. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:44795-44811. [PMID: 34244940 DOI: 10.1007/s11356-021-15260-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 06/28/2021] [Indexed: 06/13/2023]
Abstract
Microalgae biomass is a versatile option for a myriad of purposes, as it does not require farmable land for cultivation and due of its high CO2 fixation efficiency during growth. However, biomass harvesting is considered a bottleneck in the process because of its high cost. Magnetic harvesting is a promising method on account of its low cost, high harvesting speed, and efficiency, which can be used to improve the results of other harvesting methods. Here, we present the state of the art of the magnetic harvesting method. Detailed approaches involving different nanomaterials are described, including types, route of synthesis, and functionalization, variables that interfere with harvesting, and recycling methods of nanoparticles and medium. In addition to discussing the overall perspectives of the method, we provide a guideline for future research.
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Affiliation(s)
- Ana Carolina de Lima Barizão
- Department of Environmental Engineering, Federal University of Espírito Santo, Fernando Ferrari avenue, 514 - Goiabeiras, Vitória, ES, 29075-910, Brazil
| | - Jairo Pinto de Oliveira
- Department of Morphology, Federal University of Espírito Santo, Maruípe avenue, Vitória, ES, 29053-360, Brazil
| | - Ricardo Franci Gonçalves
- Department of Environmental Engineering, Federal University of Espírito Santo, Fernando Ferrari avenue, 514 - Goiabeiras, Vitória, ES, 29075-910, Brazil
| | - Sérvio Túlio Cassini
- Department of Environmental Engineering, Federal University of Espírito Santo, Fernando Ferrari avenue, 514 - Goiabeiras, Vitória, ES, 29075-910, Brazil.
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13
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Kumar N, Banerjee C, Jagadevan S. Identification, characterization, and lipid profiling of microalgae Scenedesmus sp. NC1, isolated from coal mine effluent with potential for biofuel production. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2021; 30:e00621. [PMID: 34026574 PMCID: PMC8120858 DOI: 10.1016/j.btre.2021.e00621] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 01/25/2021] [Accepted: 04/16/2021] [Indexed: 11/29/2022]
Abstract
An autoflocculating microalgal strain was isolated from coal mine effluent wastewater which was named as Scenedesmus sp. NC1 after morphological and molecularly characterization. Further analysis of internal transcribed spacer 2 (ITS2) and compensatory base changes (CBCs) showed it does not belong to the clade comprising Scenedesmus sensu stricto. In stationary phase of growth, Scenedesmus sp. NC1 exhibited excellent autoflocculation efficiency (> 88 %) within 150 min of setting. Temperature, pH, and inorganic metals exhibited minor influence on the autoflocculation activity of Scenedesmus sp. NC1. The fatty acid profiling of Scenedesmus sp.NC1 showed that palmitic acid (C16:0), oleic acid (C18:1), and stearic acid (18:0) accounted for more than 68 % of total fatty acids. Moreover, Scenedesmus sp. NC1 demonstrated significant bioflocculation potential over non-flocculating freshwater microalgae, Chlorella sp. NCQ and Micractinium sp. NCS2. Hence, Scenedesmus sp. NC1 could be effective for economical harvesting of other non-flocculating microalgae for productions of biodiesel and other metabolites.
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Affiliation(s)
- Niwas Kumar
- Department of Environmental Science & Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, India
| | - Chiranjib Banerjee
- Department of Botany & Microbiology (Deemed to be University), Haridwar, 249404, Uttarakhand, India
| | - Sheeja Jagadevan
- Department of Environmental Science & Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, India
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14
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Labeeuw L, Commault AS, Kuzhiumparambil U, Emmerton B, Nguyen LN, Nghiem LD, Ralph PJ. A comprehensive analysis of an effective flocculation method for high quality microalgal biomass harvesting. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 752:141708. [PMID: 32892040 DOI: 10.1016/j.scitotenv.2020.141708] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 08/12/2020] [Accepted: 08/13/2020] [Indexed: 06/11/2023]
Abstract
Flocculation is a low-cost harvesting technique for microalgae biomass production, but flocculation efficiency is species dependent. In this study, we investigated the efficacy of two synthetic (polyacrylamide) and one natural (chitosan) flocculants against three algal species: the cyanobacterium Synechocystis sp., the freshwater Chlorella vulgaris, and the marine Phaeodactylum tricornutum at laboratory and pilot scales to evaluate harvesting efficiency, biomass integrity and media recycling. Growth phase affected the harvesting efficiency of the eukaryotic microalgae. The flocculation was optimal at stationary phase with high flocculation efficiency achieved using polyacrylamides at 24-36 mg/g dry weight. The effect of the flocculants on the harvested biomass was investigated. The flocculated Synechocystis sp. showed a higher proportion of compromised cells compared to C. vulgaris and P. tricornutum likely due to differences in cell walls composition. Compromised cells could lead to the release of valuable products into the surrounding growth media during flocculation. The residual culture media was recycled once with no impact on cell growth for all treatments and algal species. The flocculation technique was demonstrated at pilot-scale using 350 L microalgal suspension, showing an efficiency of 82-90% at a polyacrylamide dosage of 6.5-10 mg/L. This efficiency and the biomass quality are comparable to the laboratory-scale results. Overall, results indicate that polyacrylamide flocculants work on a wide range of species without the need for pre-treatment. The information generated in this study can contribute to making the microalgae industry more competitive.
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Affiliation(s)
- Leen Labeeuw
- University of Technology Sydney, Climate Change Cluster, Faculty of Science, Sydney, NSW 2007, Australia.
| | - Audrey S Commault
- University of Technology Sydney, Climate Change Cluster, Faculty of Science, Sydney, NSW 2007, Australia
| | | | - Benjamin Emmerton
- University of Technology Sydney, Climate Change Cluster, Faculty of Science, Sydney, NSW 2007, Australia
| | - Luong N Nguyen
- University of Technology Sydney, Centre for Technology in Water and Wastewater, Sydney, NSW 2007, Australia
| | - Long D Nghiem
- University of Technology Sydney, Centre for Technology in Water and Wastewater, Sydney, NSW 2007, Australia; Nguyen Tat Thanh University, NTT Institute of Hi-Technology, Ho Chi Minh City, Viet Nam
| | - Peter J Ralph
- University of Technology Sydney, Climate Change Cluster, Faculty of Science, Sydney, NSW 2007, Australia
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15
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The impact of particulate and soluble organic matter on physicochemical properties of extracellular polymeric substances in a microalga Neocystis mucosa SX. ALGAL RES 2020. [DOI: 10.1016/j.algal.2020.102064] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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16
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Peng YY, Gao F, Yang HL, Wu HWJ, Li C, Lu MM, Yang ZY. Simultaneous removal of nutrient and sulfonamides from marine aquaculture wastewater by concentrated and attached cultivation of Chlorella vulgaris in an algal biofilm membrane photobioreactor (BF-MPBR). THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 725:138524. [PMID: 32302854 DOI: 10.1016/j.scitotenv.2020.138524] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 03/24/2020] [Accepted: 04/05/2020] [Indexed: 06/11/2023]
Abstract
Microalgae based wastewater treatment has attracted increasing attention for its many advantages in recent years. In this study, a novel microalgae biofilm membrane photobioreactor (BF-MPBR) was developed for the efficient microalgae cultivation and the removal of nutrient and sulfonamides (SAs) from marine aquaculture wastewater. Two BF-MPBRs with hydraulic retention time (HRT) of 1 day and 2 days respectively were continuously operated for 70 days without harvesting microalgae. Concentrated and attached culture of marine Chlorella vulgaris was achieved in these continuous flow BF-MPBRs due to the suspended solid carriers and microfiltration membrane module in the reactors. The algal biomass productivity achieved in BF-MPBRs with HRT of 1 day and 2 days were 14.02 and 22.03 mg L-1 day-1, respectively. In addition, at the end of the cultivation, 60.4% and 45.0% of microalgae were fixed into algal biofilm in BF-MPBRs with 1 day and 2 day HRT, respectively. Compared with batch cultivation, more efficient nutrient and SAs removal performance was achieved in BF-MPBRs, although the HRT of the BF-MPBRs used in this study was only 1 or 2 days. During the stable operation stage of the BF-MPBRs, the reduction in dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), sulfadiazine (SDZ), sulfamethazine (SMZ) and sulfamethoxazole (SMX) were found in the range of 91.0-99.6%, 92.1-98.4%, 61.0-79.2%, 50.0-76.7% and 60.8-82.1%, respectively. Therefore, nutrient and SAs were simultaneously and efficiently removed from marine aquaculture wastewater by microalgae cultivation in BF-MPBR.
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Affiliation(s)
- Yuan-Yuan Peng
- College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316000, China
| | - Feng Gao
- College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316000, China.
| | - Hong-Li Yang
- College of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316000, China
| | - Hang-Wei-Jing Wu
- College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316000, China
| | - Chen Li
- College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316000, China
| | - Miao-Miao Lu
- College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316000, China
| | - Zi-Yan Yang
- College of Marine Science and Technology, Zhejiang Ocean University, Zhoushan 316000, China
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17
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Chen Z, Shao S, He Y, Luo Q, Zheng M, Zheng M, Chen B, Wang M. Nutrients removal from piggery wastewater coupled to lipid production by a newly isolated self-flocculating microalga Desmodesmus sp. PW1. BIORESOURCE TECHNOLOGY 2020; 302:122806. [PMID: 31982846 DOI: 10.1016/j.biortech.2020.122806] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 01/08/2020] [Accepted: 01/10/2020] [Indexed: 06/10/2023]
Abstract
A newly isolated microalgal strain, Desmodesmus sp. PW1, possessing not only high potential for removing nitrogen and phosphorous from piggery wastewater but excellent self-flocculating ability, was provided here. Strain PW1 grew well in diluted and undiluted piggery wastewater, and could effectively remove total nitrogen and total phosphorus with removal rates up to 90% and 70%, respectively. In the laboratory scale by 30-L photobioreactor, microalga also performed well in TN (65.3%) and TP (83.5%) removal. Strain PW1 cultivated in the stationary phase achieved high self-flocculating efficiency (>90%) in 2.5 h of settling; meanwhile, temperature and pH slightly influenced on the flocculation. The potential mechanism on self-flocculation was considered related to hydrophobic extracellular polymeric substances. Furthermore, the fatty acid compositions of PW1 were mainly hexadecanoic acid, oleic acid and linoleic acid. Taken together, Desmodesmus sp. PW1 was the promising candidate to overcome the microalgae harvesting problem in piggery wastewater treatment.
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Affiliation(s)
- Zhihong Chen
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, China
| | - Shanshan Shao
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, China
| | - Yongjin He
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, China
| | - Qingqing Luo
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, China
| | - Mingmin Zheng
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, China
| | - Meiqing Zheng
- Fuzhou Clean Biotech Co., Ltd., Fuzhou 350100, China
| | - Bilian Chen
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, China; Engineering Research Center of Industrial Microbiology of Ministry of Education, Fujian Normal University, Fuzhou, Fujian 350117, China
| | - Mingzi Wang
- College of Life Sciences, Fujian Normal University, Fuzhou, Fujian 350117, China; Engineering Research Center of Industrial Microbiology of Ministry of Education, Fujian Normal University, Fuzhou, Fujian 350117, China.
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18
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Baroni É, Cao B, Webley PA, Scales PJ, Martin GJO. Nitrogen Availability and the Nature of Extracellular Organic Matter of Microalgae. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b05426] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Érico Baroni
- Algal Processing Group, Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
- Particulate Fluids Processing Centre, Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Bingdi Cao
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Paul A. Webley
- Algal Processing Group, Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Peter J. Scales
- Algal Processing Group, Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
- Particulate Fluids Processing Centre, Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Gregory J. O. Martin
- Algal Processing Group, Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
- Particulate Fluids Processing Centre, Department of Chemical Engineering, The University of Melbourne, Parkville, Victoria 3010, Australia
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19
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20
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Zhao F, Xiao J, Ding W, Cui N, Yu X, Xu JW, Li T, Zhao P. An effective method for harvesting of microalga: Coculture-induced self-flocculation. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2019.04.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Vu CHT, Chun SJ, Seo SH, Cui Y, Ahn CY, Oh HM. Bacterial community enhances flocculation efficiency of Ettlia sp. by altering extracellular polymeric substances profile. BIORESOURCE TECHNOLOGY 2019; 281:56-65. [PMID: 30797175 DOI: 10.1016/j.biortech.2019.02.062] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 02/11/2019] [Accepted: 02/12/2019] [Indexed: 06/09/2023]
Abstract
This study examined the effects of a bacterial community and extracellular polymeric substances (EPS) on Ettlia sp. flocculation. The growth rate, flocculation efficiency (FE), bacterial community, and EPS profile of axenic and xenic Ettlia cultures were monitored during 46 days of cultivation. For the xenic culture, with a great abundance of growth-promoting and flocculation-inducing bacteria, the biomass density was 18.75% higher and its FE reached 100% in the mid-stationary phase. Moreover, microscopic observation and a quantitative analysis of the EPS revealed the exclusive presence of long filamentous EPS and more compact structure in the xenic Ettlia culture, possibly explaining its better FE. Notwithstanding, for the axenic culture, despite a lower biomass density and reduced abundance of EPS, its FE reached 92.54% in the mid-stationary phase. Thus, the role of the bacterial community was found to be supportive rather than vital for the high settleability of the self-flocculating Ettlia microalgal culture.
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Affiliation(s)
- Chau Hai Thai Vu
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Department of Environmental Biotechnology, KRIBB School of Biotechnology, Korea University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - Seong-Jun Chun
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Department of Environmental Biotechnology, KRIBB School of Biotechnology, Korea University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - Seong-Hyun Seo
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Department of Life Science, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
| | - Yingshun Cui
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Chi-Yong Ahn
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Department of Environmental Biotechnology, KRIBB School of Biotechnology, Korea University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - Hee-Mock Oh
- Cell Factory Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; Department of Environmental Biotechnology, KRIBB School of Biotechnology, Korea University of Science & Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea.
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22
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Mahesh R, Naira VR, Maiti SK. Concomitant production of fatty acid methyl ester (biodiesel) and exopolysaccharides using efficient harvesting technology in flat panel photobioreactor with special sparging system via Scenedesmus abundans. BIORESOURCE TECHNOLOGY 2019; 278:231-241. [PMID: 30703641 DOI: 10.1016/j.biortech.2019.01.091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 01/20/2019] [Accepted: 01/21/2019] [Indexed: 06/09/2023]
Abstract
Current study focusses on the concomitant production of fatty acid methyl ester (FAME, biodiesel) and exopolysaccharides (EPS) from Scenedesmus abundans cell factory in flat panel photobioreactor using cost effective harvesting strategy. Parallel mini and medium scale flat panel photobioreactors (PBRs) with special gas sparging system enabling high gas to liquid mass transfer and efficient mixing were designed. Biomass titer of 6.9 g/l with overall biomass productivity of 1.2 g/l/day was achieved with constant high light intensity of 2162 µE/m2/s in growth phase (134 h) using optimum nutrient concentration. FAME concentration of 1.53 g/l was achieved after 15 days of nitrogen deprivation condition with productivity of 67 mg/l/day. The EPS production of 236 mg/l with a yield of 37 mg/g biomass was achieved. The strain proved its capability to produce multiproducts simultaneously in a single stage PBR by natural autoflocculation harvesting technology.
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Affiliation(s)
- R Mahesh
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Venkateswara R Naira
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Soumen K Maiti
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
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23
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Rezvani F, Sarrafzadeh MH, Seo SH, Oh HM. Optimal strategies for bioremediation of nitrate-contaminated groundwater and microalgae biomass production. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:27471-27482. [PMID: 30043348 DOI: 10.1007/s11356-018-2777-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 07/16/2018] [Indexed: 06/08/2023]
Abstract
Optimizing the mono-cultivation and mixed cultivation of Chlamydomonas reinhardtii, Chlorella vulgaris, and an Ettlia sp. was evaluated for treating nitrate-contaminated groundwater and biomass production. Ettlia sp. showed the highest nutrient assimilation and growth rate among the three microalgae during bioremediation. Light-dark cycle was the effective condition for nutrient removal and COD mitigation by microalgae. Mixed microalgae with a larger presence of the Ettlia sp. exhibited the highest biomass productivity, nitrate-nitrogen, and phosphate-phosphorus removal rates of 0.21 g/L/d, 16.6, and 3.06 mg/L/d, respectively. An N:P mass ratio of 5 was necessary to increase the mixed-microalgal performance. The settling efficiency of the mixed microalgae increased up to 0.55 when using pH modulation during 30 min. Therefore, applying an Ettlia sp.-dominant consortium was the optimum strategy for the bioremediation of nitrate-contaminated groundwater in 3 days.
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Affiliation(s)
- Fariba Rezvani
- UNESCO Chair on Water Reuse, Biotechnology Group, School of Chemical Engineering, College of Engineering, University of Tehran, P.O. Box: 11155-4563, Tehran, Iran
- Cell Factory Research Centre, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 34141, Republic of Korea
| | - Mohammad-Hossein Sarrafzadeh
- UNESCO Chair on Water Reuse, Biotechnology Group, School of Chemical Engineering, College of Engineering, University of Tehran, P.O. Box: 11155-4563, Tehran, Iran.
| | - Seong-Hyun Seo
- Cell Factory Research Centre, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 34141, Republic of Korea
| | - Hee-Mock Oh
- Cell Factory Research Centre, Korea Research Institute of Bioscience and Biotechnology, Daejeon, 34141, Republic of Korea
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24
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Ma Y, Gao Z, Wang Q, Liu Y. Biodiesels from microbial oils: Opportunity and challenges. BIORESOURCE TECHNOLOGY 2018; 263:631-641. [PMID: 29759818 DOI: 10.1016/j.biortech.2018.05.028] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 05/06/2018] [Accepted: 05/07/2018] [Indexed: 05/26/2023]
Abstract
Although biodiesel has been extensively explored as an important renewable energy source, the raw materials-associated cost poses a serious challenge on its large-scale commercial production. The first and second generations of biodiesel are mainly produced from usable raw materials, e.g. edible oils, crops etc. Such a situation inevitably imposes higher demands on land and water usage, which in turn compromise future food and water supply. Obviously, there is an urgent need to explore alternative feedstock, e.g. microbial oils which can be produced by many types of microorganisms including microalgae, fungi and bacteria with the advantages of small footprint, high lipid content and efficient uptake of carbon dioxide. Therefore, this review offers a comprehensive picture of microbial oil-based technology for biodiesel production. The perspectives and directions forward are also outlined for future biodiesel production and commercialization.
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Affiliation(s)
- Yingqun Ma
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Zhen Gao
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China
| | - Qunhui Wang
- Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China
| | - Yu Liu
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
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25
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Lv J, Wang X, Liu W, Feng J, Liu Q, Nan F, Jiao X, Xie S. The Performance of a Self-Flocculating Microalga Chlorococcum sp. GD in Wastewater with Different Ammonia Concentrations. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2018; 15:ijerph15030434. [PMID: 29498694 PMCID: PMC5876979 DOI: 10.3390/ijerph15030434] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 02/12/2018] [Accepted: 02/27/2018] [Indexed: 11/24/2022]
Abstract
The performance of a self-flocculating microalga Chlorococcum sp. GD on the flocculation, growth, and lipid accumulation in wastewater with different ammonia nitrogen concentrations was investigated. It was revealed that relative high ammonia nitrogen concentration (20–50 mg·L−1) was beneficial to the flocculation of Chlorococcum sp. GD, and the highest flocculating efficiency was up to 84.4%. It was also found that the highest flocculating efficiency occurred in the middle of the culture (4–5 days) regardless of initial ammonia concentration in wastewater. It was speculated that high flocculating efficiency was likely related to the production of extracellular proteins. 20 mg·L−1 of ammonia was found to be a preferred concentration for both biomass production and lipid accumulation. 92.8% COD, 98.8% ammonia, and 69.4% phosphorus were removed when Chlorococcum sp. GD was cultivated in wastewater with 20 mg·L−1 ammonia. The novelty and significance of the investigation was the integration of flocculation, biomass production, wastewater treatment, and lipid accumulation, simultaneously, which made Chlorococcum sp. GD a potential candidate for wastewater treatment and biodiesel production if harvested in wastewater with suitable ammonia nitrogen concentration.
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Affiliation(s)
- Junping Lv
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Xuechun Wang
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Wei Liu
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Jia Feng
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Qi Liu
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Fangru Nan
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Xiaoyan Jiao
- Institute of Agricultural Environment and Resource, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China.
| | - Shulian Xie
- School of Life Science, Shanxi University, Taiyuan 030006, China.
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26
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Hu Y, Hao X, van Loosdrecht M, Chen H. Enrichment of highly settleable microalgal consortia in mixed cultures for effluent polishing and low-cost biomass production. WATER RESEARCH 2017; 125:11-22. [PMID: 28822815 DOI: 10.1016/j.watres.2017.08.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 06/30/2017] [Accepted: 08/15/2017] [Indexed: 06/07/2023]
Abstract
Microalgae cultivation is a promising technology for integrated effluent polishing and biofuel production, but poor separability of microalgal cells hinders its industrial application. This study intended to selectively enrich settleable microalgal consortia in mixed culture by applying "wash-out" pressure, which was realized by controlling settling time (ST) and volume exchange ratio (VER) in photo-SBRs. The results demonstrated that highly settleable microalgal consortia (settling efficiency>97%; SVI = 17-50 mL/g) could be enriched from indigenous algal cultures developed in WWTP's effluent. High VER was the key factor for the fast development of settleable microalgae. VER was also a controlling factor of the algal community structure. High VERs (0.5 and 0.7) resulted in the dominance of diatom, while low VER (0.2) facilitated the dominance of cyanobacteria. The settleable microalgal consortia were very efficient in phosphorus removal (effluent PO43--P<0.1 mg/L; removal efficiency>99%), which was largely attributed to intensive chemical precipitation of phosphate induced by high pH (8.5-10). However, the high pH decreased the bioavailable inorganic carbon, resulting in incomplete nitrate removal (effluent NO3--N = 2.2-4 mg/L; removal efficiency = 61-79%) under high VERs and low lipid content (up to 10%) in the settleable microalgae. This problem could be resolved by sparging CO2 or controlling pH. Overall, this study demonstrated a simple and effective method to overcome the separation challenge in scale-up of microalgae biotechnology for advanced wastewater purification and biofuel production.
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Affiliation(s)
- Yuansheng Hu
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering & Architecture, Beijing 100044, PR China
| | - Xiaodi Hao
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering & Architecture, Beijing 100044, PR China.
| | - Mark van Loosdrecht
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering & Architecture, Beijing 100044, PR China; Department of Biotechnology, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands
| | - Huiqin Chen
- Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering & Architecture, Beijing 100044, PR China
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27
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Rezvani F, Sarrafzadeh MH, Seo SH, Oh HM. Phosphorus optimization for simultaneous nitrate-contaminated groundwater treatment and algae biomass production using Ettlia sp. BIORESOURCE TECHNOLOGY 2017; 244:785-792. [PMID: 28822952 DOI: 10.1016/j.biortech.2017.08.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 08/07/2017] [Accepted: 08/09/2017] [Indexed: 06/07/2023]
Abstract
The effects of phosphorus concentration on the cell growth, nutrient assimilation, photosynthetic parameters, and biomass recovery of Ettlia sp. were evaluated with batch experiments using groundwater, 50mg/L of N-NO3-, and different concentrations of P-PO43-: 0.5, 2.5, 5, and 10mg/L. The maximum biomass productivity and phosphorus removal rate were 0.2g/L/d and 5.95mg/L/d, respectively, with the highest phosphorus concentration of 10mg/L. However, a phosphorus concentration of 5mg/L (N:P=10) was sufficient to ensure an effective nitrogen removal rate of 11mg/L/d, maximum growth rate of 0.88/d, and biomass recovery of 0.72. The appropriate hydraulic retention time was considered as 4days on a large scale to meet the effluent limitation demands of water. While nitrogen depletion had a significant effect on the photosynthetic parameters and ratio of chlorophyll a to dry cell weight during the stationary phase, the effect of phosphorus was negligible during the cultivation.
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Affiliation(s)
- Fariba Rezvani
- UNESCO Chair on Water Reuse, Biotechnology Group, School of Chemical Engineering, College of Engineering, University of Tehran, Iran; Cell Factory Research Centre, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea
| | - Mohammad-Hossein Sarrafzadeh
- UNESCO Chair on Water Reuse, Biotechnology Group, School of Chemical Engineering, College of Engineering, University of Tehran, Iran.
| | - Seong-Hyun Seo
- Cell Factory Research Centre, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea
| | - Hee-Mock Oh
- Cell Factory Research Centre, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea
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28
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Lv J, Guo J, Feng J, Liu Q, Xie S. Effect of sulfate ions on growth and pollutants removal of self-flocculating microalga Chlorococcum sp. GD in synthetic municipal wastewater. BIORESOURCE TECHNOLOGY 2017; 234:289-296. [PMID: 28334665 DOI: 10.1016/j.biortech.2017.03.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Revised: 03/05/2017] [Accepted: 03/08/2017] [Indexed: 06/06/2023]
Abstract
Sulfate is a primary sulfur source and can be available in wastewaters. Nevertheless, effect of sulfate ions on growth and pollutants removal of microalgae seems to be less investigated. At the present study, self-flocculating microalga Chlorococcum sp. GD was grown in synthetic municipal wastewater with different sulfate concentrations. Results indicated that Chlorococcum sp. GD grew better in synthetic municipal wastewater with 18, 45, 77, 136 and 271mg/L SO42- than in wastewater without SO42-. Chlorococcum sp. GD had also excellent removal efficiencies of nitrogen and phosphorus and effectively flocculated in sulfate wastewater. Sulfate deprivation weakened the growth, pollutants removal and self-flocculation of Chlorococcum sp. GD in wastewater. Antioxidative enzymes activity significantly increased and photosynthetic activity significantly decreased when Chlorococcum sp. GD was cultivated in sulfate-free wastewater. Sulfate deprivation probably reduced cell activity of growth, pollutants removal and flocculation via inducing the over-accumulation of reactive oxygen species (ROS).
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Affiliation(s)
- Junping Lv
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Junyan Guo
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Jia Feng
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Qi Liu
- School of Life Science, Shanxi University, Taiyuan 030006, China.
| | - Shulian Xie
- School of Life Science, Shanxi University, Taiyuan 030006, China.
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29
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Lv J, Guo J, Feng J, Liu Q, Xie S. A comparative study on flocculating ability and growth potential of two microalgae in simulated secondary effluent. BIORESOURCE TECHNOLOGY 2016; 205:111-117. [PMID: 26820924 DOI: 10.1016/j.biortech.2016.01.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Revised: 01/10/2016] [Accepted: 01/11/2016] [Indexed: 06/05/2023]
Abstract
The flocculating ability was an important property to microalgal harvesting, especially in secondary effluent. In this study, the flocculating ability of two microalgae, Chlorococcum sp. GD and Parachlorella kessleri TY, was evaluated after 10d of cultivation in secondary effluent. After 180min of settling, the flocculating ability of Chlorococcum sp. GD and P. kessleri TY was 84.43% and 16.23%, respectively. It was suggested that Chlorococcum sp. GD was an excellent self-flocculating microalgae. The mechanism on self-flocculating of Chlorococcum sp. GD was probably related to hydrophobic extracellular polymeric substances (EPS). Besides, compared to P. kessleri TY, the nitrogen and phosphorus removal efficiency of Chlorococcum sp. GD was high, which was up to 66.51% and 74.19%, respectively. Chlorococcum sp. GD also had high lipid content and biomass concentration. Therefore, Chlorococcum sp. GD could be regarded as a promising candidate for microalgal cultivation and harvesting in secondary effluent.
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Affiliation(s)
- Junping Lv
- School of Life Science, Shanxi University, Taiyuan 030006, China
| | - Junyan Guo
- School of Life Science, Shanxi University, Taiyuan 030006, China
| | - Jia Feng
- School of Life Science, Shanxi University, Taiyuan 030006, China
| | - Qi Liu
- School of Life Science, Shanxi University, Taiyuan 030006, China
| | - Shulian Xie
- School of Life Science, Shanxi University, Taiyuan 030006, China.
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30
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't Lam GP, Giraldo JB, Vermuë MH, Olivieri G, Eppink MHM, Wijffels RH. Understanding the salinity effect on cationic polymers in inducing flocculation of the microalga Neochloris oleoabundans. J Biotechnol 2016; 225:10-7. [PMID: 27002231 DOI: 10.1016/j.jbiotec.2016.03.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Revised: 02/24/2016] [Accepted: 03/03/2016] [Indexed: 10/22/2022]
Abstract
A mechanistic study was performed to evaluate the effect of salinity on cationic polymeric flocculants, that are used for the harvesting of microalgae. The polyacrylamide Synthofloc 5080H and the polysaccharide Chitosan were employed for the flocculation of Neochloris oleoabundans. In seawater conditions, a maximum biomass recovery of 66% was obtained with a dosage of 90mg/L Chitosan. This recovery was approximately 25% lower compared to Synthofloc 5080H reaching recoveries greater than 90% with dosages of 30mg/L. Although different recoveries were obtained with both flocculants, the polymers exhibit a similar apparent polymer length, as was evaluated from viscosity measurements. While both flocculants exhibit similar polymer lengths in increasing salinity, the zeta potential differs. This indicates that polymeric charge dominates flocculation. With increased salinity, the effectivity of cationic polymeric flocculants decreases due to a reduction in cationic charge. This mechanism was confirmed through a SEM analysis and additional experiments using flocculants with various charge densities.
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Affiliation(s)
- G P 't Lam
- Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, the Netherlands.
| | - J B Giraldo
- Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, the Netherlands
| | - M H Vermuë
- Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, the Netherlands
| | - G Olivieri
- Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, the Netherlands; Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Vincenzo Tecchio, 80, 80125 Napoli, Italy
| | - M H M Eppink
- Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, the Netherlands
| | - R H Wijffels
- Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, the Netherlands; University of Nordland, Faculty of Biosciences and Aquaculture, N-8049 Bodø, Norway
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Taparia T, MVSS M, Mehrotra R, Shukla P, Mehrotra S. Developments and challenges in biodiesel production from microalgae: A review. Biotechnol Appl Biochem 2015; 63:715-726. [DOI: 10.1002/bab.1412] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 06/29/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Tanvi Taparia
- Department of Biological Sciences; Birla Institute of Technology and Science; Pilani Rajasthan India
| | - Manjari MVSS
- Department of Biological Sciences; Birla Institute of Technology and Science; Pilani Rajasthan India
| | - Rajesh Mehrotra
- Department of Chemistry; Birla Institute of Technology and Science; Pilani Rajasthan India
| | - Paritosh Shukla
- Department of Biological Sciences; Birla Institute of Technology and Science; Pilani Rajasthan India
| | - Sandhya Mehrotra
- Department of Biological Sciences; Birla Institute of Technology and Science; Pilani Rajasthan India
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Alam MA, Wan C, Zhao XQ, Chen LJ, Chang JS, Bai FW. Enhanced removal of Zn(2+) or Cd(2+) by the flocculating Chlorella vulgaris JSC-7. JOURNAL OF HAZARDOUS MATERIALS 2015; 289:38-45. [PMID: 25704433 DOI: 10.1016/j.jhazmat.2015.02.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Microalgae are attracting attention due to their potentials in mitigating CO2 emissions and removing environmental pollutants. However, harvesting microalgal biomass from diluted cultures is one of the bottlenecks for developing economically viable processes for this purpose. Microalgal cells can be harvested by cost-effective sedimentation when flocculating strains are used. In this study, the removal of Zn(2+) and Cd(2+) by the flocculating Chlorella vulgaris JSC-7 was studied. The experimental results indicated that more than 80% Zn(2+) and 60% Cd(2+) were removed by the microalgal culture within 3 days in the presence up to 20.0mg/L Zn(2+) and 4.0mg/L Cd(2+), respectively, which were much higher than that observed with the culture of the non-flocculating C. vulgaris CNW11. Furthermore, the mechanism underlying this phenomenon was explored by investigating the effect of Zn(2+) and Cd(2+) on the growth and metabolic activities of the microalgal strains. It was found that the flocculation of the microalga improved its growth, synthesis of photosynthetic pigments and antioxidation activity under the stressful conditions, indicating a better tolerance to the heavy metal ions for a potential in removing them more efficiently from contaminated wastewaters, together with a bioremediation of other nutritional components contributed to the eutrophication of aquatic ecosystems.
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Affiliation(s)
- Md Asraful Alam
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China
| | - Chun Wan
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China
| | - Xin-Qing Zhao
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China; State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Li-Jie Chen
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China
| | - Jo-Shu Chang
- Department of Chemical Engineering, University Center for Bioscience and Biotechnology and Research for Energy Technology and Strategy Center, National Cheng Kung University, Tainan 701, Taiwan
| | - Feng-Wu Bai
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China; State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China.
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Yoo C, La HJ, Kim SC, Oh HM. Simple processes for optimized growth and harvest of Ettlia sp. by pH control using CO2 and light irradiation. Biotechnol Bioeng 2014; 112:288-96. [PMID: 25182602 DOI: 10.1002/bit.25362] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 07/25/2014] [Accepted: 08/08/2014] [Indexed: 11/09/2022]
Abstract
Microalgae cultures show wide range of pH depending on the availability of light and CO2 for their strain specific photosynthesis. Thus, the modulation of light irradiation and CO2 supply can be applied for the pH control of microalgae cultures. The optimal pH of Ettlia sp. YC001, for phototrophic growth and auto-flocculation was investigated by controlling light irradiation and 10% CO2 supply. Ettlia sp. YC001 showed the highest biomass productivity, 96.7 mg L(-1) d(-1) , at pH 8.5. The flocculating activity of Ettlia sp. YC001 showed a sigmoid pattern with pH increase and was above 70% at pH 10.5. Based on these differentiated optimal pH regimes for the growth and flocculation, an integrated process consisting of cultivation and settling vessels was proposed. The integrated process demonstrated that high flocculation activity of Ettlia sp. YC001 could be achieved in the settling vessel with various hydraulic retention times by only irradiation of light to maintain high pH while maintaining the optimal growth in cultivation vessel with the light irradiation and CO2 supply at pH 8.5. Thus, the proposed strategy for pH control would provide a simple, cost-effective, and flexible design and operation for microalgae cultivation-harvest systems.
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Affiliation(s)
- Chan Yoo
- Environmental Biotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 305-806, Korea; Department of Biological Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea
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Mechanism behind autoflocculation of unicellular green microalgae Ettlia texensis. J Biotechnol 2014; 174:34-8. [DOI: 10.1016/j.jbiotec.2014.01.026] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 01/12/2014] [Accepted: 01/16/2014] [Indexed: 11/19/2022]
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Alam MA, Wan C, Guo SL, Zhao XQ, Huang ZY, Yang YL, Chang JS, Bai FW. Characterization of the flocculating agent from the spontaneously flocculating microalga Chlorella vulgaris JSC-7. J Biosci Bioeng 2014; 118:29-33. [PMID: 24507901 DOI: 10.1016/j.jbiosc.2013.12.021] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 12/02/2013] [Accepted: 12/24/2013] [Indexed: 12/01/2022]
Abstract
High cost of biomass recovery is one of the bottlenecks for developing cost-effective processes with microalgae, particularly for the production of biofuels and bio-based chemicals through biorefinery, and microalgal biomass recovery through cell flocculation is a promising strategy. Some microalgae are naturally flocculated whose cells can be harvested by simple sedimentation. However, studies on the flocculating agents synthesized by microalgae cells are still very limited. In this work, the cell flocculation of a spontaneously flocculating microalga Chlorella vulgaris JSC-7 was studied, and the flocculating agent was identified to be cell wall polysaccharides whose crude extract supplemented at low dosage of 0.5 mg/L initiated the more than 80% flocculating rate of freely suspended microalgae C. vulgaris CNW11 and Scenedesmus obliquus FSP. Fourier transform infrared (FTIR) analysis revealed a characteristic absorption band at 1238 cm(-1), which might arise from PO asymmetric stretching vibration of [Formula: see text] phosphodiester. The unique cell wall-associated polysaccharide with molecular weight of 9.86×10(3) g/mol, and the monomers consist of glucose, mannose and galactose with a molecular ratio of 5:5:2. This is the first time to our knowledge that the flocculating agent from C. vulgaris has been characterized, which could provide basis for understanding the cell flocculation of microalgae and breeding of novel flocculating microalgae for cost-effective biomass harvest.
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Affiliation(s)
- Md Asraful Alam
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China
| | - Chun Wan
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China
| | - Suo-Lian Guo
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China
| | - Xin-Qing Zhao
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China.
| | - Zih-You Huang
- Institute of Biochemical Sciences, National Taiwan University, Taipei 106, Taiwan
| | - Yu-Liang Yang
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei 115, Taiwan
| | - Jo-Shu Chang
- Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan
| | - Feng-Wu Bai
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, China
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