1
|
Perečinec MG, Babić S, Čižmek L, Selmani A, Popović NT, Sikirić MD, Strunjak-Perović I, Čož-Rakovac R. Selenite as a Lipid Inductor in Marine Microalga Dunaliella tertiolecta: Comparison of One-Stage and Two-Stage Cultivation Strategies. Appl Biochem Biotechnol 2022; 194:930-949. [PMID: 34586600 DOI: 10.1007/s12010-021-03659-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 09/03/2021] [Indexed: 11/25/2022]
Abstract
Microalgae have emerged as one of the most promising alternative sources of biofuels due to their high lipid accumulation ability. High lipid content is of pivotal importance for biodiesel production. In order to obtain high lipid content, modifications of culture conditions and development of an efficient lipid induction method are called for. In the present study, the possibility of using selenium in a form of sodium selenite as a lipid inductor in marine microalga Dunaliella tertiolecta was investigated during one- and two-stage cultivation modes. The effects of selenite on algal growth, pigment content, oxidative stress, and neutral lipid content were determined during both cultivation modes. The results revealed that the two-stage cultivation on 10.00-40.00 mg L-1 of selenite resulted in up to twofold higher algal cell density compared to the one-stage cultivation. Selenite concentrations from 2.50 to 20.00 mg L-1 increased lipid peroxidation during both cultivation modes, emphasizing the selenite-induced oxidative stress accompanied by the increased lipid accumulation in microalgae cells. During one- and two-stage cultivation on 20.00 mg L-1 of selenite, lipid content increased 2.39- and 5.73-fold at days 9 and 14 of cultivation, respectively. Moreover, the highest obtained neutral lipid content during the two-stage cultivation was 5.40-fold higher than lipid content obtained during the one-stage cultivation. Collectively, these results suggest that the two-stage cultivation strategy, initiated with optimal culture conditions for biomass production and followed by the addition of selenite as a stress inductor, can be successfully deployed to enhance the lipid content in D. tertiolecta.
Collapse
Affiliation(s)
- Maja Galić Perečinec
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
- Centre of Excellence for Marine Bioprospecting (BioProCro), Ruđer Bošković Institute, Zagreb, Croatia
| | - Sanja Babić
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia.
- Centre of Excellence for Marine Bioprospecting (BioProCro), Ruđer Bošković Institute, Zagreb, Croatia.
| | - Lara Čižmek
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
- Centre of Excellence for Marine Bioprospecting (BioProCro), Ruđer Bošković Institute, Zagreb, Croatia
| | - Atiđa Selmani
- Laboratory for Biocolloids and Surface Chemistry, Division of Physical Chemistry Zagreb, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
| | - Natalija Topić Popović
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
- Centre of Excellence for Marine Bioprospecting (BioProCro), Ruđer Bošković Institute, Zagreb, Croatia
| | - Maja Dutour Sikirić
- Laboratory for Biocolloids and Surface Chemistry, Division of Physical Chemistry Zagreb, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
| | - Ivančica Strunjak-Perović
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
- Centre of Excellence for Marine Bioprospecting (BioProCro), Ruđer Bošković Institute, Zagreb, Croatia
| | - Rozelindra Čož-Rakovac
- Laboratory for Aquaculture Biotechnology, Division of Materials Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, Zagreb, Croatia
- Centre of Excellence for Marine Bioprospecting (BioProCro), Ruđer Bošković Institute, Zagreb, Croatia
| |
Collapse
|
2
|
Yan X, Zhu C, Huang B, Yan Q, Zhang G. Enhanced nitrogen removal from electroplating tail wastewater through two-staged anoxic-oxic (A/O) process. BIORESOURCE TECHNOLOGY 2018; 247:157-164. [PMID: 28950122 DOI: 10.1016/j.biortech.2017.09.084] [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: 08/04/2017] [Revised: 09/11/2017] [Accepted: 09/13/2017] [Indexed: 06/07/2023]
Abstract
Consisted of anaerobic (ANA), anoxic-1 (AN1), aerobic-1 (AE1), anoxic-2 (AN2), aerobic-2 (AE2) reactors and sediment tank, the two-staged A/O process was applied for depth treatment of electroplating tail wastewater with high electrical conductivity and large amounts of ammonia nitrogen. It was found that the NH4+-N and COD removal efficiencies reached 97.11% and 83.00%, respectively. Besides, the short-term salinity shock of the control, AE1 and AE2 indicated that AE1 and AE2 have better resistance to high salinity when the concentration of NaCl ranged from 1 to 10g/L. Meanwhile, it was found through high-throughput sequencing that bacteria genus Nitrosomonas, Nitrospira and Thauera, which are capable of nitrogen removal, were enriched in the two-staged A/O process. Moreover, both salt-tolerant bacteria and halophili bacteria were also found in the combined process. Therefore, microbial community within the two-staged A/O process could be acclimated to high electrical conductivity, and adapted for electroplating tail wastewater treatment.
Collapse
Affiliation(s)
- Xinmei Yan
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Chunyan Zhu
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Bin Huang
- Institute of Applied Ecology, CAS, Shenyang 110016, China
| | - Qun Yan
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China; Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215011, China.
| | - Guangsheng Zhang
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
| |
Collapse
|
3
|
Microbial communities in liquid and fiber fractions of food waste digestates are differentially resistant to inhibition by ammonia. Appl Microbiol Biotechnol 2015; 99:3317-26. [DOI: 10.1007/s00253-015-6432-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 01/22/2015] [Accepted: 01/23/2015] [Indexed: 11/25/2022]
|
4
|
Liu H, Yan Q, Shen W. Biohydrogen facilitated denitrification at biocathode in bioelectrochemical system (BES). BIORESOURCE TECHNOLOGY 2014; 171:187-192. [PMID: 25194913 DOI: 10.1016/j.biortech.2014.08.056] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 08/09/2014] [Accepted: 08/11/2014] [Indexed: 06/03/2023]
Abstract
Reductive removal of nitrate in bioelectrochemical system (BES) at abiotic cathode, biocathode and biohydrogen facilitated biocathode were investigated. It was found that nitrate removal efficiency reached 95% and 59% at the biohydrogen facilitated biocathode and biocathode respectively, while which was only 13% at the abiotic cathode. Meanwhile, activity of nitrate reductase reached 0.701 g-N/Lh for the biohydrogen facilitated group, which was about 9.3 times of the biocathode group. Moreover, electrochemical performances as power density, ohmic resistance, and polarization resistance of the biohydrogen facilitated group reached 76.96 mW/m(3), 8.63 ohm and 383 ohm, respectively, which were better than two other groups. Finally, an obvious shift of bacterial community responsible for the enhanced nitrate reduction between the two biocathode groups was observed. Therefore, nitrate reduction in BES could be enhanced at the biocathode than that of the abiotic cathode, and then be further boosted with the combination of biohydrogen.
Collapse
Affiliation(s)
- Hao Liu
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Qun Yan
- School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China.
| | - Wei Shen
- School of Biotechnology, Jiangnan University, Wuxi 214122, China
| |
Collapse
|
5
|
Boboescu IZ, Ilie M, Gherman VD, Mirel I, Pap B, Negrea A, Kondorosi É, Bíró T, Maróti G. Revealing the factors influencing a fermentative biohydrogen production process using industrial wastewater as fermentation substrate. BIOTECHNOLOGY FOR BIOFUELS 2014; 7:139. [PMID: 25278996 PMCID: PMC4177422 DOI: 10.1186/s13068-014-0139-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 09/05/2014] [Indexed: 06/01/2023]
Abstract
BACKGROUND Biohydrogen production through dark fermentation using organic waste as a substrate has gained increasing attention in recent years, mostly because of the economic advantages of coupling renewable, clean energy production with biological waste treatment. An ideal approach is the use of selected microbial inocula that are able to degrade complex organic substrates with simultaneous biohydrogen generation. Unfortunately, even with a specifically designed starting inoculum, there is still a number of parameters, mostly with regard to the fermentation conditions, that need to be improved in order to achieve a viable, large-scale, and technologically feasible solution. In this study, statistics-based factorial experimental design methods were applied to investigate the impact of various biological, physical, and chemical parameters, as well as the interactions between them on the biohydrogen production rates. RESULTS By developing and applying a central composite experimental design strategy, the effects of the independent variables on biohydrogen production were determined. The initial pH value was shown to have the largest effect on the biohydrogen production process. High-throughput sequencing-based metagenomic assessments of microbial communities revealed a clear shift towards a Clostridium sp.-dominated environment, as the responses of the variables investigated were maximized towards the highest H2-producing potential. Mass spectrometry analysis suggested that the microbial consortium largely followed hydrogen-generating metabolic pathways, with the simultaneous degradation of complex organic compounds, and thus also performed a biological treatment of the beer brewing industry wastewater used as a fermentation substrate. CONCLUSIONS Therefore, we have developed a complex optimization strategy for batch-mode biohydrogen production using a defined microbial consortium as the starting inoculum and beer brewery wastewater as the fermentation substrate. These results have the potential to bring us closer to an optimized, industrial-scale system which will serve the dual purpose of wastewater pre-treatment and concomitant biohydrogen production.
Collapse
Affiliation(s)
- Iulian Zoltan Boboescu
- />Polytechnic University of Timisoara, Timisoara, Romania
- />Seqomics Biotechnology Ltd, Szeged, Hungary
| | - Mariana Ilie
- />Polytechnic University of Timisoara, Timisoara, Romania
| | | | - Ion Mirel
- />Polytechnic University of Timisoara, Timisoara, Romania
| | | | - Adina Negrea
- />Polytechnic University of Timisoara, Timisoara, Romania
| | - Éva Kondorosi
- />Hungarian Academy of Sciences, Biological Research Centre, Temesvari krt. 62., Szeged, 6726 Hungary
| | - Tibor Bíró
- />Szent István University, Faculty of Economics, Agricultural and Health Studies, Szarvas, Hungary
| | - Gergely Maróti
- />Polytechnic University of Timisoara, Timisoara, Romania
- />Hungarian Academy of Sciences, Biological Research Centre, Temesvari krt. 62., Szeged, 6726 Hungary
| |
Collapse
|