Biodiesel production from microalgae Dunaliella tertiolecta: a study on economic feasibility on large-scale cultivation systems

2021 ◽  
Author(s):  
Akash Patel ◽  
Bharat Gami ◽  
Pankaj Patel ◽  
Beena Patel
Keyword(s):  
Large Scale ◽  
Dunaliella Tertiolecta ◽  
Economic Feasibility ◽  
Biodiesel Production ◽  
Cultivation Systems ◽  
Large Scale Cultivation

A study on large scale cultivation of Microcystis aeruginosa under open raceway pond at semi-continuous mode for biodiesel production

2014 ◽  
Vol 172 ◽  
pp. 186-193 ◽  
Author(s):  
Veeramuthu Ashokkumar ◽  
Elango Agila ◽  
Zainal Salam ◽  
Mohanadoss Ponraj ◽  
Mohd Fadhil Md Din ◽  
...  
Keyword(s):  
Microcystis Aeruginosa ◽  
Large Scale ◽  
Biodiesel Production ◽  
Continuous Mode ◽  
Open Raceway Pond ◽  
Raceway Pond ◽  
Large Scale Cultivation

scholarly journals Optimization cultivation of Chlamydomonas reinhardtii in a tubular photobioreactor (2000 Liter) for biomass and green bioenergy (biodiesel) production

2020 ◽  
Vol 48 (3) ◽  
pp. 1439-1457
Author(s):  
Hanaa H. ABD EL BAKY ◽  
Gamal S. EL BAROTY
Keyword(s):  
Fatty Acids ◽  
Chlamydomonas Reinhardtii ◽  
Lipid Content ◽  
Large Scale ◽  
Saturated Fatty Acids ◽  
Economic Feasibility ◽  
Lipid Productivity ◽  
Biodiesel Production ◽  
Tubular Photobioreactor ◽  
High Lipid

The biodiesel can be produced from diverse microalgae lipids as alternative and renewable fuel. Thus, the aim of this study was to optimize the Chlamydomonas reinhardtii promising species as biodiesel feedstock for large-scale cultivation in Egypt. To understand some of the triggers required for the metabolic pathway switch to lipid accumulation, the effect of carbon sources and the three elements availability (N, P, S) in C. reinhardtii growth medium was determined. A local microalgae C. reinhardtii was cultured in modified Sueoka medium containing various concentrations of CO2 and bicarbonate (NaHCO3) (in 2-liter flasks) as a carbon source. The optimal source in term biomass, high lipid productivity (10.3 mgL-1d-1) and a higher lipid content (22.76%) were obtained in 6% CO2 culture. Then, the availability of N, P, S (various concentrations of N, P and S) nutrients elements was added to 6% CO2 culture, for produce a highest lipid content and lipid productivity. As expected, under low availability N-1.78 mM; P-0.14mM and S-0.10 mM mediums, C. reinhardtii showed a high accumulation lipid content. Therefore, to improve the economic feasibility of microalgae biofuels production, its concentrations were selected to combine (N+P+S) in order to cultivation of C. reinhardtii in a multi-tubular photobioreactor (400 liter) to produce high lipid contents. Under limited condition, the biomass dry weight, biomass productivity, lipid content and lipid productivity were found to be 3.11 (gL-1), 0.15±0.012 (g-1L-1d-1), 22.76% (w/w %) and 1.9± 0.35 (mg-1L-1d-1), respectively. The extracted lipid was found to have physical and chemical properties similar that plant oils using for biodiesel production. The FAME profiling of prepared biodiesel shows the presence of considerable amount of 36.97% saturated fatty acids (palmitic acid and stearic acid, together) with 27.33% unsaturated (oleic acid and linoleic acid) fatty acids. The FAME had a low iodine value and high CN, which meet with the appropriate of biodiesel standards (EN 14214 and ASTM D6751). Thus, C. reinhardtii appears to be more feasible for high quality biodiesel production.

scholarly journals ANALISIS BIAYA MANFAAT PROGRAM PEMBANGUNAN FOOD ESTATE DALAM PERSPEKTIF PERENCANAAN WILAYAH : STUDI KASUS PROVINSI KALIMANTAN BARAT

2017 ◽  
Vol 4 (2) ◽  
pp. 79
Author(s):  
Asti Asti ◽  
Dominicus Savio Priyarsono ◽  
Sahara Sahara
Keyword(s):  
Sensitivity Analysis ◽  
Large Scale ◽  
Development Program ◽  
Investment Project ◽  
Economic Feasibility ◽  
Large Scale Cultivation ◽  
Inputs And Outputs

<em>Food Estate Development Program is an investment project on food cropsubsector in the form of business activities with large-scale cultivation (&gt; 25 ha), especially rice commodities. The present study aims to analyze economic feasibility of Food Estate Development Program. The methode used to answer the research was NPV, IRR, BCR, Pay Back Period and sensitivity analysis. The results show that the NPV is positive amounted 153.761,83 billions rupiah, IRR of 63%, BCR of 1,25, Pay Back Period of 8 years and the sensitivity analysis of sensitive to changes in prices of inputs and outputs. From the above considerations investment criteria, indicates that program is economically feasible.</em>

scholarly journals JA signal-mediated immunity of Dendrobium catenatum to necrotrophic Southern Blight pathogen

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Cong Li ◽  
Qiuyi Shen ◽  
Xiang Cai ◽  
Danni Lai ◽  
Lingshang Wu ◽  
...  
Keyword(s):  
Large Scale ◽  
Plant Immunity ◽  
Expression Patterns ◽  
Protein Domain ◽  
Functional Identification ◽  
Necrotrophic Pathogen ◽  
Southern Blight ◽  
Meja Treatment ◽  
Sclerotium Delphinii ◽  
Large Scale Cultivation

Abstract Background Dendrobium catenatum belongs to the Orchidaceae, and is a precious Chinese herbal medicine. In the past 20 years, D. catenatum industry has developed from an endangered medicinal plant to multi-billion dollar grade industry. The necrotrophic pathogen Sclerotium delphinii has a devastating effection on over 500 plant species, especially resulting in widespread infection and severe yield loss in the process of large-scale cultivation of D. catenatum. It has been widely reported that Jasmonate (JA) is involved in plant immunity to pathogens, but the mechanisms of JA-induced plant resistance to S. delphinii are unclear. Results In the present study, the role of JA in enhancing D. catenatum resistance to S. delphinii was investigated. We identified 2 COI1, 13 JAZ, and 12 MYC proteins in D. catenatum genome. Subsequently, systematic analyses containing phylogenetic relationship, gene structure, protein domain, and motif architecture of core JA pathway proteins were conducted in D. catenatum and the newly characterized homologs from its closely related orchid species Phalaenopsis equestris and Apostasia shenzhenica, along with the well-investigated homologs from Arabidopsis thaliana and Oryza sativa. Public RNA-seq data were investigated to analyze the expression patterns of D. catenatum core JA pathway genes in various tissues and organs. Transcriptome analysis of MeJA and S. delphinii treatment showed exogenous MeJA changed most of the expression of the above genes, and several key members, including DcJAZ1/2/5 and DcMYC2b, are involved in enhancing defense ability to S. delphinii in D. catenatum. Conclusions The findings indicate exogenous MeJA treatment affects the expression level of DcJAZ1/2/5 and DcMYC2b, thereby enhancing D. catenatum resistance to S. delphinii. This research would be helpful for future functional identification of core JA pathway genes involved in breeding for disease resistance in D. catenatum.

scholarly journals Stand-Alone Direct Current Power Network Based on Photovoltaics and Lithium-Ion Batteries for Reverse Osmosis Desalination Plant

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2772
Author(s):  
Vishwas Powar ◽  
Rajendra Singh
Keyword(s):  
Reverse Osmosis ◽  
Direct Current ◽  
Cyber Security ◽  
Large Scale ◽  
Lithium Ion ◽  
Economic Feasibility ◽  
Power Network ◽  
Variable Effect ◽  
Desalination Plant ◽  
Reverse Osmosis Desalination

Plummeting reserves and increasing demand of freshwater resources have culminated into a global water crisis. Desalination is a potential solution to mitigate the freshwater shortage. However, the process of desalination is expensive and energy-intensive. Due to the water-energy-climate nexus, there is an urgent need to provide sustainable low-cost electrical power for desalination that has the lowest impact on climate and related ecosystem challenges. For a large-scale reverse osmosis desalination plant, we have proposed the design and analysis of a photovoltaics and battery-based stand-alone direct current power network. The design methodology focusses on appropriate sizing, optimum tilt and temperature compensation techniques based on 10 years of irradiation data for the Carlsbad Desalination Plant in California, USA. A decision-tree approach is employed for ensuring hourly load-generation balance. The power flow analysis evaluates self-sufficient generation even during cloud cover contingencies. The primary goal of the proposed system is to maximize the utilization of generated photovoltaic power and battery energy storage with minimal conversions and transmission losses. The direct current based topology includes high-voltage transmission, on-the-spot local inversion, situational awareness and cyber security features. Lastly, economic feasibility of the proposed system is carried out for a plant lifetime of 30 years. The variable effect of utility-scale battery storage costs for 16–18 h of operation is studied. Our results show that the proposed design will provide low electricity costs ranging from 3.79 to 6.43 ¢/kWh depending on the debt rate. Without employing the concept of baseload electric power, photovoltaics and battery-based direct current power networks for large-scale desalination plants can achieve tremendous energy savings and cost reduction with negligible carbon footprint, thereby providing affordable water for all.

scholarly journals Optimizing the catalytic activities of methanol and thermotolerant Kocuria flava lipases for biodiesel production from cooking oil wastes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Azhar Najjar ◽  
Elhagag Ahmed Hassan ◽  
Nidal Zabermawi ◽  
Saber H. Saber ◽  
Leena H. Bajrai ◽  
...  
Keyword(s):  
Ph Value ◽  
Energy Content ◽  
Value Added ◽  
Relative Activity ◽  
Economic Feasibility ◽  
Biodiesel Production ◽  
Molar Ratios ◽  
Cooking Oil ◽  
Enzyme Biocatalysis ◽  
Methanol Tolerant

AbstractIn this study, two highly thermotolerant and methanol-tolerant lipase-producing bacteria were isolated from cooking oil and they exhibited a high number of catalytic lipase activities recording 18.65 ± 0.68 U/mL and 13.14 ± 0.03 U/mL, respectively. Bacterial isolates were identified according to phenotypic and genotypic 16S rRNA characterization as Kocuria flava ASU5 (MT919305) and Bacillus circulans ASU11 (MT919306). Lipases produced from Kocuria flava ASU5 showed the highest methanol tolerance, recording 98.4% relative activity as well as exhibited high thermostability and alkaline stability. Under the optimum conditions obtained from 3D plots of response surface methodology design, the Kocuria flava ASU5 biocatalyst exhibited an 83.08% yield of biodiesel at optimized reaction variables of, 60 ○C, pH value 8 and 1:2 oil/alcohol molar ratios in the reaction mixture. As well as, the obtained results showed the interactions of temperature/methanol were significant effects, whereas this was not noted in the case of temperature/pH and pH/methanol interactions. The obtained amount of biodiesel from cooking oil was 83.08%, which was analyzed by a GC/Ms profile. The produced biodiesel was confirmed by Fourier-transform infrared spectroscopy (FTIR) approaches showing an absorption band at 1743 cm−1, which is recognized for its absorption in the carbonyl group (C=O) which is characteristic of ester absorption. The energy content generated from biodiesel synthesized was estimated as 12,628.5 kJ/mol. Consequently, Kocuria flava MT919305 may provide promising thermostable, methanol-tolerant lipases, which may improve the economic feasibility and biotechnology of enzyme biocatalysis in the synthesis of value-added green chemicals.

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