1
|
Wang H, Wu P, Zheng D, Deng L, Wang W. N-Acyl-Homoserine Lactone (AHL)-Mediated Microalgal-Bacterial Communication Driving Chlorella-Activated Sludge Bacterial Biofloc Formation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:12645-12655. [PMID: 35881886 DOI: 10.1021/acs.est.2c00905] [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] [Indexed: 06/15/2023]
Abstract
N-acyl-homoserine lactones (AHLs) as autoinducers of Gram-negative bacteria for quorum sensing regulation have shown positive effects on the production of aromatic proteins in extracellular polymeric substances (EPSs) during bioflocculation. To investigate the role of AHLs in aromatic protein production, a Chlorella-bacteria system with great bioflocculation was established via fed-batch cultivation. Tryptophan and aromatic proteins as the main compounds in the EPS of bioflocs showed an increasing trend during fed-batch cultivation. The Chlorella cells only secreted tryptophan rather than aromatic proteins during axenic cultivation. N-dodecanoyl-l-homoserine lactone (C12-HSL) was correlated with the flocculation activity and extracellular protein content of bioflocs during fed-batch cultivation. The addition of exogenous C12-HSL enhanced the flocculation activity of the Chlorella-bacteria system and aromatic protein production in the EPS. Chlorella cells sensed exogenous C12-HSL and significantly upregulated the aromatic protein synthesis pathway during axenic cultivation. In addition, vanillin as a quorum-sensing inhibitor suppressed the positive effect of C12-HSL on flocculation activity and aromatic protein production and synthesis. This result indicated that vanillin intercepts the response of Chlorella cells to C12-HSL. Overall, C12-HSL is supposed to be an important signal molecule to achieve communication between Chlorella and Gram-negative bacteria and subsequently induce Chlorella cells to produce aromatic proteins for biofloc formation.
Collapse
Affiliation(s)
- Hong Wang
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
- Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu 610213, China
| | - Peike Wu
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
- Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
| | - Dan Zheng
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
- Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
| | - Liangwei Deng
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
- Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
| | - Wenguo Wang
- Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
- Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, China
| |
Collapse
|
2
|
Andrade BB, Cardoso LG, de Souza CO, Druzian JI, Cunha Lima STD. Technological Prospecting: Electroflocculation Harvesting Procedure to Obtain Microalgae Biomass. Ind Biotechnol (New Rochelle N Y) 2022. [DOI: 10.1089/ind.2021.0010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Lucas Guimarães Cardoso
- Laboratory of Algae Biotechnology, Department of Botany, Federal University of São Carlos, São Paulo, Brazil
| | - Carolina Oliveira de Souza
- Graduate Program in Food Science, Faculty of Pharmacy, Federal University of Bahia, Salvador, Bahia, Brazil
| | - Janice Izabel Druzian
- Bromatological Analysis Department, Faculty of Pharmacy, Federal University of Bahia, Salvador, Bahia, Brazil
| | - Suzana Telles da Cunha Lima
- Bioprospecting and Biotechnology Laboratory, Institute of Biology, Federal University of Bahia, Salvador, Bahia, Brazil
| |
Collapse
|
3
|
Wang H, Qi B, Jiang X, Jiang Y, Yang H, Xiao Y, Jiang N, Deng L, Wang W. Microalgal interstrains differences in algal-bacterial biofloc formation during liquid digestate treatment. BIORESOURCE TECHNOLOGY 2019; 289:121741. [PMID: 31323710 DOI: 10.1016/j.biortech.2019.121741] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/28/2019] [Accepted: 06/29/2019] [Indexed: 06/10/2023]
Abstract
In this study, the effect of microalgal strains on the formation of algal-bacterial biofloc was investigated in liquid digestate pretreated by a sequencing batch reactor (SBR), which loaded much aerobic bacteria from activated sludge. Six microalgal strains resulted in three cases: no-bioflocculation (Scenedesmus obliquus and Botryococcus braunii), optimal-bioflocculation with high flocculation activity and good growth (Chlorella sp. BWY-1, Haematococcus pluvialis and Dictyosphaerium ehnenbergianum) and over-bioflocculation with high flocculation activity and bad growth (Chlorella vulgaris). Chlorella sp. BWY-1 provided a better level of flocculation activity and growth. Polysaccharides and proteins were present in EPS of algal-bacterial biofloc, and their distribution was confirmed by staining with alcian blue and fluorescein isothiocyanate (FITC).
Collapse
Affiliation(s)
- Hong Wang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Bufan Qi
- College of Pharmacy and Biological Engineering, Chengdu University, No. 2205, Cheng Luo Road, Chengdu 610106, PR China
| | - Xiaomei Jiang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Yiqi Jiang
- Environmental Science & Engineering Research Center, Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, PR China
| | - Han Yang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Youqian Xiao
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Na Jiang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Liangwei Deng
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China
| | - Wenguo Wang
- Key Laboratory of Development and Application of Rural Renewable Energy, Biogas Institute of Ministry of Agriculture, Chengdu 610041, PR China.
| |
Collapse
|
4
|
Optimisation of Tray Drier Microalgae Dewatering Techniques Using Response Surface Methodology. ENERGIES 2018. [DOI: 10.3390/en11092327] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The feasibility of the application of a tray drier in dewatering microalgae was investigated. Response surface methodology (RSM) based on Central Composite Design (CCD) was used to evaluate and optimise the effect of air temperature and air velocity as independent variables on the dewatering efficiency as a response function. The significance of independent variables and their interactions was tested by means of analysis of variance (ANOVA) with a 95% confidence level. Results indicate that the air supply temperature was the main parameter affecting dewatering efficiency, while air velocity had a slight effect on the process. The optimum operating conditions to achieve maximum dewatering were determined: air velocities and temperatures ranged between 4 to 10 m/s and 40 to 56 °C respectively. An optimised dewatering efficiency of 92.83% was achieved at air an velocity of 4 m/s and air temperature of 48 °C. Energy used per 1 kg of dry algae was 0.34 kWh.
Collapse
|
5
|
|
6
|
Estime B, Ren D, Sureshkumar R. Cultivation and energy efficient harvesting of microalgae using thermoreversible sol-gel transition. Sci Rep 2017; 7:40725. [PMID: 28102313 PMCID: PMC5244363 DOI: 10.1038/srep40725] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 12/12/2016] [Indexed: 01/21/2023] Open
Abstract
Microalgae represent a promising source of renewable biomass for the production of biofuels and valuable chemicals. However, energy efficient cultivation and harvesting technologies are necessary to improve economic viability. A Tris-Acetate-Phosphate-Pluronic (TAPP) medium that undergoes a thermoreversible sol-gel transition is developed to efficiently culture and harvest microalgae without affecting the productivity as compared to that in traditional culture in a well-mixed suspension. After seeding microalgae in the TAPP medium in a solution phase at 15 °C, the temperature is increased by 7 °C to induce gelation. Within the gel, microalgae are observed to grow in large clusters rather than as isolated cells. The settling velocity of the microalgal clusters is approximately ten times larger than that of individual cells cultured in typical solution media. Such clusters are easily harvested gravimetrically by decreasing the temperature to bring the medium to a solution phase.
Collapse
Affiliation(s)
- Bendy Estime
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, USA
| | - Dacheng Ren
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, USA
- Department of Civil and Environmental Engineering, Syracuse University, Syracuse, New York 13244, USA
- Department of Biology, Syracuse University, Syracuse, New York 13244, USA
- Syracuse Biomaterials Institute, Syracuse University, Syracuse, New York 13244, USA
| | - Radhakrishna Sureshkumar
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, USA
- Department of Physics, Syracuse University, Syracuse, New York 13244, USA
| |
Collapse
|
7
|
Li Y, Xu Y, Liu L, Jiang X, Zhang K, Zheng T, Wang H. First evidence of bioflocculant from Shinella albus with flocculation activity on harvesting of Chlorella vulgaris biomass. BIORESOURCE TECHNOLOGY 2016; 218:807-15. [PMID: 27423548 DOI: 10.1016/j.biortech.2016.07.034] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 07/07/2016] [Accepted: 07/09/2016] [Indexed: 05/22/2023]
Abstract
Bioflocculant from Shinella albus xn-1 could be used to harvest energy-producing microalga Chlorella vulgaris biomass for the first time. In this study, we investigated the flocculation activity and mode of strain xn-1, the characteristics of bioflocculant, the effect of flocculation conditions and optimized the flocculation efficiency. The results indicated that strain xn-1 exhibited flocculation activity through secreting bioflocculant; the bioflocculant with high thermal stability, pH stability and low molecular weight was proved to be not protein and polysaccharide, and flocculation active component was confirmed to contain triple bond and cumulated double bonds; algal pH, temperature and metal ions showed great impacts on the flocculation efficiency of bioflocculant; the maximum flocculation activity of bioflocculant reached 85.65% after the response surface optimization. According to the results, the bioflocculant from S. albus xn-1 could be a good potential in applications for high-efficiency harvesting of microalgae.
Collapse
Affiliation(s)
- Yi Li
- College of Life Sciences, Henan Normal University, Xinxiang 453007, China; State Key Laboratory of Marine Environmental Science, Xiamen University, School of Life Sciences, Xiamen University, Xiamen 361005, China
| | - Yanting Xu
- College of Life Sciences, Henan Normal University, Xinxiang 453007, China
| | - Lei Liu
- College of Life Sciences, Henan Normal University, Xinxiang 453007, China
| | - Xiaobing Jiang
- College of Life Sciences, Henan Normal University, Xinxiang 453007, China
| | - Kun Zhang
- College of Life Sciences, Henan Normal University, Xinxiang 453007, China
| | - Tianling Zheng
- State Key Laboratory of Marine Environmental Science, Xiamen University, School of Life Sciences, Xiamen University, Xiamen 361005, China
| | - Hailei Wang
- College of Life Sciences, Henan Normal University, Xinxiang 453007, China.
| |
Collapse
|