scholarly journals Life Cycle Analysis on Fossil Energy Ratio of Algal Biodiesel: Effects of Nitrogen Deficiency and Oil Extraction Technology

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Hou Jian ◽  
Yang Jing ◽  
Zhang Peidong
Keyword(s):  
Life Cycle ◽  
Oil Extraction ◽  
Biodiesel Production ◽  
Energy Ratio ◽  
Nitrogen Deprivation ◽  
Extraction Technology ◽  
Fossil Energy ◽  
Algal Oil ◽  
Algal Biodiesel ◽  
Fossil Energy Ratio

Life cycle assessment (LCA) has been widely used to analyze various pathways of biofuel preparation from “cradle to grave.” Effects of nitrogen supply for algae cultivation and technology of algal oil extraction on life cycle fossil energy ratio of biodiesel are assessed in this study. Life cycle fossil energy ratio ofChlorella vulgarisbased biodiesel is improved by growing algae under nitrogen-limited conditions, while the life cycle fossil energy ratio of biodiesel production fromPhaeodactylum tricornutumgrown with nitrogen deprivation decreases. Compared to extraction of oil from dried algae, extraction of lipid from wet algae with subcritical cosolvents achieves a 43.83% improvement in fossil energy ratio of algal biodiesel when oilcake drying is not considered. The outcome for sensitivity analysis indicates that the algal oil conversion rate and energy content of algae are found to have the greatest effects on the LCA results of algal biodiesel production, followed by utilization ratio of algal residue, energy demand for algae drying, capacity of water mixing, and productivity of algae.

Sustainability study of biodiesel from Acrocomia totai

2014 ◽  
Vol 16 (6) ◽  
pp. 1046-1056 ◽  
Keyword(s):  
Life Cycle ◽  
Return On Investment ◽  
Oil Extraction ◽  
The Other ◽  
Ghg Emission ◽  
Fossil Energy ◽  
Energy Return On Investment ◽  
Greenhouse Emissions ◽  
Energy Ratios ◽  
Fossil Energy Ratio

<p>The aim of this work is to quantify the life-cycle emissions in terms of CO<sub>2</sub> equivalent grams per megajoule of biodiesel produced from Acrocomia totai, a native oily seed from Paraguay, according to Directive 2009/28/EC. The other key point is to calculate the amount of energy invested to get a megajoule of biodiesel, by means of two different ratios: the EROI (Energy Return On Investment) and the FER (Fossil Energy Ratio).</p> <p>The LCA (Life Cycle Assessment) performed considers the following steps: harvesting, transportation, oil extraction from the fruits, transportation of the vegetable oil, oil conversion to biodiesel, distribution and combustion of the biodiesel. In this case, two different scenarios have been considered: Scenario 1: full distribution in Paraguay; Scenario 2: exportation to European countries, such as Spain.</p> <div> <p>The first set of results is the emissions in each step of the LC (Life Cycle) as well as the total emissions. The second set of results is the energy ratios. The GHG emission saving is 86.69 % with respect to the LC greenhouse emissions from Diesel EN-590 (with a default emissions value of 83.8 g CO<sub>2e</sub> MJ<sub>diesel-1</sub>) for Scenario 1 and 74.24 % for Scenario 2.</p> </div> <p>&nbsp;</p>

Life-Cycle Assessment of Potential Algal Biodiesel Production in the United Kingdom: A Comparison of Raceways and Air-Lift Tubular Bioreactors

2010 ◽  
Vol 24 (7) ◽  
pp. 4062-4077 ◽  
Author(s):  
Anna L. Stephenson ◽  
Elena Kazamia ◽  
John S. Dennis ◽  
Christopher J. Howe ◽  
Stuart A. Scott ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
United Kingdom ◽  
Life Cycle ◽  
Biodiesel Production ◽  
The United Kingdom ◽  
Algal Biodiesel ◽  
Air Lift

scholarly journals The advances and limitations in biodiesel production: feedstocks, oil extraction methods, production, and environmental life cycle assessment

2020 ◽  
Vol 13 (4) ◽  
pp. 275-294
Author(s):  
Konstantin Pikula ◽  
Alexander Zakharenko ◽  
Antonios Stratidakis ◽  
Mayya Razgonova ◽  
Alexander Nosyrev ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Extraction Methods ◽  
Oil Extraction ◽  
Biodiesel Production ◽  
Environmental Life Cycle Assessment

Biofuels, fossil energy ratio, and the future of energy production

2017 ◽  
Vol 2 (5) ◽  
Author(s):  
David Consiglio
Keyword(s):  
Climate Change ◽  
Energy Production ◽  
Fossil Fuels ◽  
Energy Ratio ◽  
Fossil Energy ◽  
Energy Needs ◽  
The Future ◽  
Scientists And Engineers ◽  
Fossil Energy Ratio

AbstractTwo hundred years ago, much of humanity’s energy came from burning wood. As energy needs outstripped supplies, we began to burn fossil fuels. This transition allowed our civilization to modernize rapidly, but it came with heavy costs including climate change. Today, scientists and engineers are taking another look at

Energy balances of biodiesel production from soybean and canola in Canada

2007 ◽  
Vol 87 (4) ◽  
pp. 793-801 ◽  
Author(s):  
Elwin G Smith ◽  
H. H. Janzen ◽  
Nathaniel K Newlands
Keyword(s):  
Life Cycle ◽  
Crop Production ◽  
Oil Extraction ◽  
Biodiesel Production ◽  
Protein Meal ◽  
Animal Fats ◽  
Farm Production ◽  
Energy Inputs ◽  
Energy Balances ◽  
First Time

Biodiesel is currently produced in Canada mostly from recycled oils and animal fats. If biodiesel is to supply 5% of diesel usage, a government objective, first-time vegetable, likely from canola and soybean, oil will also be required to provide adequate feedstocks. In this review, we estimate the life cycle energy balances for biodiesel produced from soybean and canola oil under Canadian conditions. The three broad areas of energy inputs were crop production, oil extraction, and transesterification of the vegetable oil into biodiesel. Per unit seed yield, farm production energy inputs for canola were about three times higher than for soybean, mostly because of higher nitrogen fertilizer requirements for canola. Energy required for processing and oil extraction, per unit oil, was higher for soybean. Energy allocation for co-products was allocated using a system expansion approach. Protein meal was assigned about 12% of the energy expended for canola to grow the crop and extract the oil, and about 37% for soybean. Glycerine produced during the transesterification process was allocated energy on a weight basis (11.4%). The ratio of biodiesel energy produced per energy input ranged from 2.08 t o 2.41. The energy ratio was similar for soybean and canola:soybean required less energy inputs, but also produced less oil than canola, for a given weight of seed. Key words: Biodiesel, energy, life cycle analysis, soybean, canola

scholarly journals PENGARUH EXTERNALITAS PADA NET ENERGY RATIO PRODUKSI BIODIESEL MIKROALGA = Externalities Effect on Net Energy Ratio of Microalgae Biodiesel Production

2016 ◽  
Vol 14 (2) ◽  
pp. 89
Author(s):  
Arif Dwi Santoso ◽  
Kardono . ◽  
Joko P. Susanto
Keyword(s):  
Energy Source ◽  
Renewable Energy Source ◽  
Renewable Energy ◽  
Algal Biomass ◽  
Biodiesel Production ◽  
Energy Ratio ◽  
Energy Sources ◽  
Net Energy ◽  
Fossil Energy ◽  
Net Energy Ratio

In the future, Indonesia is predicted to be hit by national energy crisis so that it needs to do some efforts to overcome its dependences on these fossil energy sources. One of the efforts to lower high dependency on fossil energy sources is to find renewable energy sources. Microalgae has a great potential as a renewable energy source because it has the advantages of high productivity and sustainability. Development of microalgal biomasses as a renewable energy source is however, constrained by high cost of biomass production and low value of NER (net energy ratio) comparing tothese of other biomasses, like palm oil, jatrophaand tubers. Literature study shows that the method of NER calculation on biodiesel production does not yet include environmental variables. This researchis therefore to evaluate the values of NER before and after the addition of environmental commodity variables that consist of social, environmental and land use cost. Results of NER values calculatedusing existing LCA and modification LCA method are found to be 0,62 ± 0,078 and 0,60 ± 0,075 for algal biodiesel and 4,17 ± 0,79 and 3,22 ± 0,61 for palm biodiesel. The lower value of NER value differences for algal biomass indicates that biodiesel production from algal biomass is more environmentally-friendly. In addition, it is predicted that microalgae will have a significant contribution in the green house gases (GHGs) mitigation by replacing fossil fuel in the future through its role as a biodiesel. Keywords: net energy ratio, life cycle analysis, environmental commodity, microalgae, biodieselAbstrakDi masa depan, Indonesia diperkirakan akan dilanda krisis energi nasional sehingga perlu melakukan upaya untuk mengatasi ketergantungan terhadap energi fosil tersebut. Salah satu upayauntuk menurunkan ketergantungan pada energi fosil adalah untuk menemukan sumber energi terbarukan. Mikroalga memiliki potensi besar sebagai sumber energi terbarukan karena memiliki keuntungan dari produktivitas tinggi. Pengembangan biomasa mikroalga sebagai sumber energi terbarukan terkendala oleh tingginya biaya produksi dan nilai rendah APM (rasio energi bersih) dibandingkan dengan biomasa lainnya, seperti kelapa sawit ataupun umbi-umbian. Studi literatur menunjukkan bahwa metode perhitungan APM pada produksi biodiesel belum menyertakan variabel lingkungan. Oleh karena itu penelitian ini adalah untuk mengevaluasi nilai-nilai APM sebelum dansesudah penambahan variabel komoditas lingkungan yang terdiri dari biaya sosial, lingkungan dan penggunaan lahan. Hasil nilai NER dihitung dengan menggunakan LCA yang ada dan metode LCAmodifikasi yang ditemukan 0,62 ± 0078 dan 0,60 ± 0,075 untuk biodiesel alga dan 4,17 ± 0,79 dan 3,22 ± 0,61 untuk biodiesel sawit. Nilai yang lebih rendah dari perbedaan nilai APM untuk biomassaalga menunjukkan bahwa produksi biodiesel dari biomassa alga lebih ramah lingkungan. Selain itu, diperkirakan bahwa mikroalga akan memiliki kontribusi yang signifikan dalam mitigasi gas rumahkaca (GRK) dengan mengganti bahan bakar fosil. Kata kunci: rasio energi, analisa siklus hidup, komoditas lingkungan, mikroalga, biodiesel

scholarly journals OPPORTUNITIES FOR REDUCTION OF ENERGY CONSUMPTION IN THE LIFE CYCLE OF BIODIESEL OBTAINED FROM MICROALGAE SCENEDESMUS SP.

2014 ◽  
Vol 46 (1) ◽  
pp. 94-103
Author(s):  
Virginija Skorupskaite ◽  
Violeta Makareviciene
Keyword(s):  
Life Cycle ◽  
Energy Consumption ◽  
Biodiesel Production ◽  
Growth Media ◽  
Total Energy Consumption ◽  
Microalgal Biomass ◽  
Microalgae Oil ◽  
Reduction Of Energy Consumption ◽  
Fossil Energy Ratio ◽  
Liquid Biofuel

The article considers the opportunities for reduction of energy consumption in the life cycle of biodiesel obtained from microalgae oil. Results show that by introducing technical glycerol and substrate leftover after production of biogas into the microalgae growth media energy consumption can be significantly reduced. Production of biogas from de-oiled microalgae improves the energy balance of the life cycle of biodiesel obtained from microalgae oil. It is impossible to obtain fuel containing more energy than would be used in the process of production if microalgae for biodiesel production are cultivated in conventional growth media. Only by subjecting microalgal biomass for production of gaseous and liquid biofuel (biodiesel and biogas) the total energy consumption is lower and equals to 65802.03 MJt-1 than energy value of biofuel, i.e. 79083.32 MJt-1. In this case the fossil energy ratio (FER) for biodiesel reaches 1.2.

Efficient Production of Biodiesel Catalyzed by Acidic Nanoporous Carbon Materials：A Review

2020 ◽  
Vol 16 ◽  
Author(s):  
Anping Wang ◽  
Heng Zhang ◽  
Hu Li ◽  
Song Yang
Keyword(s):  
Pore Structure ◽  
Active Sites ◽  
Catalytic Performance ◽  
Nanoporous Carbon ◽  
Biodiesel Production ◽  
Efficient Production ◽  
Fossil Energy ◽  
Catalytic Materials ◽  
High Acid ◽  
Carbon Based

Background: With the gradual decrease of fossil energy, the development of alternatives to fossil energy has attracted more and more attention. Biodiesel is considered to be the most potent alternative to fossil energy, mainly due to its green, renewable and biodegradable advantages. The stable, efficient and reusable catalysts are undoubtedly the most critical in the preparation of biodiesel. Among them, nanoporous carbon-based acidic materials are very important biodiesel catalysts. Objective: The latest advances of acidic nanoporous carbon catalysts in biodiesel production was reviewed. Methods: Biodiesel is mainly synthesized by esterification and transesterification. Due to the important role of nanoporous carbon-based acidic materials in the catalytic preparation of biodiesel, we focused on the synthesis, physical and chemical properties, catalytic performance and reusability. Results: Acidic catalytic materials have a good catalytic performance for high acid value feedstocks. However, the preparation of biodiesel with acid catalyst requires relatively strict reaction conditions. The application of nanoporous acidic carbon-based materials, due to the support of carbon-based framework, makes the catalyst have good stability and unique pore structure, accelerates the reaction mass transfer speed and accelerates the reaction. Conclusion: Nanoporous carbon-based acidic catalysts have the advantages of suitable pore structure, high active sites, and high stability. In order to make these catalytic processes more efficient, environmentally friendly and low cost, it is an important research direction for the future biodiesel catalysts to develop new catalytic materials with high specific surface area, suitable pore size, high acid density, and excellent performance.

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