Removal of ofloxacin with biofuel production by oleaginous microalgae Scenedesmus obliquus

2020 ◽  
Vol 315 ◽  
pp. 123738
Author(s):  
Libin Yang ◽  
Li Ren ◽  
Xiaobo Tan ◽  
Huaqiang Chu ◽  
Jiabin Chen ◽  
...  
Keyword(s):  
Scenedesmus Obliquus ◽  
Biofuel Production ◽  
Oleaginous Microalgae

scholarly journals Bio-Flocculation Property Analyses of Oleaginous Microalgae Auxenochlorella protothecoides UTEX 2341

2021 ◽  
Vol 13 (5) ◽  
pp. 2885
Author(s):  
Jinyu Li ◽  
Baozhen Li ◽  
Jinshui Yang
Keyword(s):  
Large Scale ◽  
Municipal Wastewater ◽  
Biofuel Production ◽  
Microalgae Harvesting ◽  
Flocculation Efficiency ◽  
Oleaginous Microalgae ◽  
Freeze Dried ◽  
Flocculation Ability ◽  
Powder Samples ◽  
Auxenochlorella Protothecoides

The bio-flocculation ability of UTEX 2341 was studied for the purpose of improving microalgae harvesting efficiency to cut the high cost of biofuel production. The algae cells of UTEX 2341 cultured under heterotrophic and municipal wastewater conditions were found to have better self-flocculation ability, with flocculation rates of 92% and 85% at 2 h, respectively. Moreover, the flocculation rates of 16 freeze-dried microalgae powder samples cultured under different stress conditions were 0~72% with an algae powder dosage of 35 mg L−1. The flocculation efficiency of DIM, DCd1, DT28, and L6S was stable under different pH of 3~9 and temperatures of 15~50 °C. For samples of IM, LCd0.6, LMn2, and LZn2, the flocculation efficiency decreased or increased respectively with increased pH or temperatures. Though the flocculation properties of the eight samples showed wide differences, their flocculant compositions were almost the same with unknown components occupying large proportions. More studies needed to be further carried out to reveal the flocculation mechanisms and analyze the flocculation abilities in practical application, which would be conducive to future large-scale application of the bio-flocculation method and also cost reduction.

Effect of flue gas CO2 on the growth, carbohydrate and fatty acid composition of a green microalga Scenedesmus obliquus for biofuel production

2016 ◽  
Vol 38 (16) ◽  
pp. 2085-2092 ◽  
Author(s):  
Min-Kyu Ji ◽  
Hyun-Shik Yun ◽  
Jae-Hoon Hwang ◽  
El-Sayed Salama ◽  
Byong-Hun Jeon ◽  
...  
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Flue Gas ◽  
Scenedesmus Obliquus ◽  
Biofuel Production ◽  
Green Microalga

scholarly journals Biodiesel Production From Lignocellulosic Biomass Using Oleaginous Microbes: Prospects for Integrated Biofuel Production

2021 ◽  
Vol 12 ◽  
Author(s):  
Anjani Devi Chintagunta ◽  
Gaetano Zuccaro ◽  
Mahesh Kumar ◽  
S. P. Jeevan Kumar ◽  
Vijay Kumar Garlapati ◽  
...  
Keyword(s):  
Vegetable Oils ◽  
Circular Economy ◽  
Edible Oils ◽  
Lipid Extraction ◽  
Biodiesel Production ◽  
Biofuel Production ◽  
Oleaginous Microalgae ◽  
Waste Oils ◽  
Lignocellulosic Substrates ◽  
Liquid Biofuel

Biodiesel is an eco-friendly, renewable, and potential liquid biofuel mitigating greenhouse gas emissions. Biodiesel has been produced initially from vegetable oils, non-edible oils, and waste oils. However, these feedstocks have several disadvantages such as requirement of land and labor and remain expensive. Similarly, in reference to waste oils, the feedstock content is succinct in supply and unable to meet the demand. Recent studies demonstrated utilization of lignocellulosic substrates for biodiesel production using oleaginous microorganisms. These microbes accumulate higher lipid content under stress conditions, whose lipid composition is similar to vegetable oils. In this paper, feedstocks used for biodiesel production such as vegetable oils, non-edible oils, oleaginous microalgae, fungi, yeast, and bacteria have been illustrated. Thereafter, steps enumerated in biodiesel production from lignocellulosic substrates through pretreatment, saccharification and oleaginous microbe-mediated fermentation, lipid extraction, transesterification, and purification of biodiesel are discussed. Besides, the importance of metabolic engineering in ensuring biofuels and biorefinery and a brief note on integration of liquid biofuels have been included that have significant importance in terms of circular economy aspects.

scholarly journals Cultivation of Oily Microalgae for the Production of Third-Generation Biofuels

2019 ◽  
Vol 11 (19) ◽  
pp. 5424 ◽  
Author(s):  
Preeti Pal ◽  
Kit Wayne Chew ◽  
Hong-Wei Yen ◽  
Jun Wei Lim ◽  
Man Kee Lam ◽  
...  
Keyword(s):  
Fossil Fuels ◽  
Biofuel Production ◽  
Economic Sustainability ◽  
Microalgae Cultivation ◽  
Promising Alternative ◽  
New Methods ◽  
Oleaginous Microalgae ◽  
Accumulation Capacity ◽  
Metabolic Properties ◽  
Harvesting Process

Biofuel production by oleaginous microalgae is a promising alternative to the conventional fossil fuels. Many microalgae species have been investigated and deemed as potential renewable sources for the production of biofuel, biogas, food supplements and other products. Oleaginous microalgae, named for their ability to produce oil, are reported to store 30–70% of lipid content due to its metabolic properties under nutrient starvation conditions. This review presents the assortment of the research studies focused on biofuel production from oleaginous microalgae. The new methods and technologies developed for oleaginous microalgae cultivation to improve their biomass content and lipid accumulation capacity were reviewed. The production of renewable, carbon neutral, bio-based or microalgae-based transport fuels are necessary for environmental protection and economic sustainability. Microalgae are a significant source of renewable biodiesel because of their ability to produce oils in the presence of sunlight more efficiently than that of crop oils. This review will provide the background to understanding the bottlenecks and the need for improvement in the cultivation or harvesting process for oleaginous microalgae.

Thermal degradation of Scenedesmus obliquus for biofuel production

2020 ◽  
Author(s):  
Swagat Chutia ◽  
Minakshi Gohain ◽  
Manash J. Borah ◽  
Nayan M. Kakoty ◽  
Dhanapati Deka
Keyword(s):  
Thermal Degradation ◽  
Scenedesmus Obliquus ◽  
Biofuel Production

scholarly journals Characterization of a Microalgal UV Mutant for CO2 Biofixation and Biomass Production

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Feng Qi ◽  
Daoji Wu ◽  
Ruimin Mu ◽  
Shuo Zhang ◽  
Xinyi Xu
Keyword(s):  
Biomass Production ◽  
Parental Strain ◽  
Scenedesmus Obliquus ◽  
Growth Potential ◽  
Biofuel Production ◽  
Energy Storage Materials ◽  
Total Carbohydrate ◽  
Control Growth ◽  
High Level

The mutagenesis is an emerging strategy for screening microalgal candidates for CO2 biofixation and biomass production. In this study, by 96-well microplates-UV mutagenesis, a mutant stemmed from Scenedesmus obliquus was screened and named as SDEC-1M. To characterize SDEC-1M, it was cultivated under air and high level CO2 (15% v/v), and its parental strain (PS) was considered as control. Growth characterizations showed that SDEC-1M grew best in high level CO2. It indicated that the mutant had high CO2 tolerance (HCT) and growth potential under high level CO2. Richer total carbohydrate content (37.26%) and lipid content (24.80%) demonstrated that, compared to its parental strain, SDEC-1M was apt to synthesize energy storage materials, especially under high CO2 level. Meanwhile, the highest light conversion efficiency (approximately 18 %) was also obtained. Thus, the highest overall biomass productivities were achieved in SDEC-1M under high level CO2, largely attributed to that the highest productivities of total lipid, total carbohydrate, and crude protein were also achieved in the meantime. By modified UV, therefore, mutagenized SDEC-1M was the better candidate for CO2 biofixation and biofuel production than its parental strain.

scholarly journals Metagenome Survey of a Multispecies and Alga-Associated Biofilm Revealed Key Elements of Bacterial-Algal Interactions in Photobioreactors

2013 ◽  
Vol 79 (20) ◽  
pp. 6196-6206 ◽  
Author(s):  
Ines Krohn-Molt ◽  
Bernd Wemheuer ◽  
Malik Alawi ◽  
Anja Poehlein ◽  
Simon Güllert ◽  
...  
Keyword(s):  
Bacterial Species ◽  
Scenedesmus Obliquus ◽  
Maximum Size ◽  
Bacterial Biofilm ◽  
Biofuel Production ◽  
Associated Bacteria ◽  
Content Type ◽  
Rrna Phylogeny ◽  
Biofilm Bacteria ◽  
Algal Productivity

ABSTRACTPhotobioreactors (PBRs) are very attractive for sunlight-driven production of biofuels and capturing of anthropogenic CO2. One major problem associated with PBRs however, is that the bacteria usually associated with microalgae in nonaxenic cultures can lead to biofouling and thereby affect algal productivity. Here, we report on a phylogenetic, metagenome, and functional analysis of a mixed-species bacterial biofilm associated with the microalgaeChlorella vulgarisandScenedesmus obliquusin a PBR. The biofilm diversity and population dynamics were examined through 16S rRNA phylogeny. Overall, the diversity was rather limited, with approximately 30 bacterial species associated with the algae. The majority of the observed microorganisms were affiliated withAlphaproteobacteria,Betaproteobacteria, andBacteroidetes. A combined approach of sequencing via GS FLX Titanium from Roche and HiSeq 2000 from Illumina resulted in the overall production of 350 Mbp of sequenced DNA, 165 Mbp of which was assembled in larger contigs with a maximum size of 0.2 Mbp. A KEGG pathway analysis suggested high metabolic diversity with respect to the use of polymers and aromatic and nonaromatic compounds. Genes associated with the biosynthesis of essential B vitamins were highly redundant and functional. Moreover, a relatively high number of predicted and functional lipase and esterase genes indicated that the alga-associated bacteria are possibly a major sink for lipids and fatty acids produced by the microalgae. This is the first metagenome study of microalga- and PBR-associated biofilm bacteria, and it gives new clues for improved biofuel production in PBRs.

scholarly journals Optimization of Suitable Eco-Friendly Technology for Bioremediation of Textile Wastewaters

2019 ◽  
Vol 8 (11) ◽  
pp. 3482-3486
Keyword(s):  
Waste Water ◽  
Scenedesmus Obliquus ◽  
Sewage Treatment ◽  
Chlorella Pyrenoidosa ◽  
Biofuel Production ◽  
Human Beings ◽  
Effective Removal ◽  
Clean Environment ◽  
New Treatment ◽  
Textile Wastewaters

Water is one of the major products of nature used enormously by human beings and it is not unnatural that any growing community generates enormous waste water or sewage. As a clean environment is a prerequisite for a healthy living in any urban settlement, proper treatment and safe disposal of sewage call for prime attention. Untreated waste water can cause pollution of surface and ground waters. Many new developments in the field of sewage treatment are eventually taking place. These developments include improvements for more effective removal of pollutants and new treatment processes capable of removing pollutants not ordinarily removed by conventional methods. Three types of textile wastewaters (Acid Yellow dye, Acid orange dye and Basic pink dye) has been used for wastewater treatment and microalgal (Chlorella pyrenoidosa and Scenedesmus obliquus) biofuel production. Nitrogen content in textile wastewaters is very less, hence urea is used as nitrogen source in wastewater. Discharge of untreated domestic and industrial wastewater into aquatic bodies is posing a serious eutrophication threat, leading to a slow degradation of the water resources. A number of physical, chemical and biological methods have been developed for the treatment of wastewaters; among these, the use of microalgae is considered as a more eco-friendly and economical approaches.

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