Process Economics and Greenhouse Gas Audit for Microalgal Biodiesel Production

2012 ◽  
pp. 709-744
Author(s):  
Razif Harun ◽  
Mark Doyle ◽  
Rajprathab Gopiraj ◽  
Michael Davidson ◽  
Gareth M. Forde ◽  
...  
Keyword(s):  
Greenhouse Gas ◽  
Biodiesel Production ◽  
Process Economics ◽  
Microalgal Biodiesel

scholarly journals Value-Added Products from Urea Glycerolysis Using a Heterogeneous Biosolids-Based Catalyst

Catalysts ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 373 ◽  
Author(s):  
Mattia Bartoli ◽  
Chengyong Zhu ◽  
Michael Chae ◽  
David Bressler
Keyword(s):  
Weight Ratio ◽  
Value Added ◽  
Economic Feasibility ◽  
Biodiesel Production ◽  
Wastewater Management ◽  
Thermal Hydrolysis ◽  
Process Economics ◽  
Air Stream ◽  
Increasing Temperature ◽  
Value Added Products

Although thermal hydrolysis of digested biosolids is an extremely promising strategy for wastewater management, the process economics are prohibitive. Here, a biosolids-based material generated through thermal hydrolysis was used as a catalyst for urea glycerolysis performed under several conditions. The catalytic system showed remarkable activity, reaching conversion values of up to 70.8 ± 0.9% after six hours, at 140 °C using a catalyst/glycerol weight ratio of 9% and an air stream to remove NH3 formed during the process. Temperature played the most substantial role among reaction parameters; increasing temperature from 100 °C to 140 °C improved conversion by 35% and glycidol selectivity by 22%. Furthermore, the catalyst retained good activity even after the fourth catalytic run (conversion rate of 56.4 ± 1.3%) with only a slight decrease in glycidol selectivity. Thus, the use of a biosolids-based catalyst may facilitate conversion of various glycerol sources (i.e., byproduct streams from biodiesel production) into value-added products such as glycidol, and may also improve the economic feasibility of using thermal hydrolysis for treatment of biosolids.

Involvement of green technology in microalgal biodiesel production

2020 ◽  
Vol 35 (2) ◽  
pp. 173-188
Author(s):  
Samakshi Verma ◽  
Arindam Kuila
Keyword(s):  
Green Technology ◽  
Genetically Engineered ◽  
Biodiesel Production ◽  
Policy Network ◽  
Renewable Energy Policy ◽  
Algal Biodiesel ◽  
Microalgal Biodiesel ◽  
Cellular Components ◽  
Conventional Oil ◽  
Transgenic Strains

AbstractAccording to the report of the renewable energy policy network for the 21st century published in 2014, biodiesel and bioethanol are the most used biofuels and are responsible for transportation worldwide. Biodiesel specially has shown an increase in production globally by 15 times by volume from 2002 to 2012. Promising feedstock of biodiesel are cyanobacteria and microalgae as they possess a shorter cultivation time (4 fold lesser) and high oil content (10 fold higher) than corn, jatropha and soybean (conventional oil-producing territorial plants). Various valuable natural chemicals are also produced from these organisms including food supplements such as docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA), pigments, and vitamins. Additionally, cellular components of microalgae and cyanobacteria are connected with therapeutic characteristics such as anti-inflammatory, antioxidant, antiviral and immune stimulating. Commercialization of algal biodiesel (or other products) can be achieved by isolating and identifying the high-yielding strains that possess a faster growth rate. Indigenous strains can be genetically engineered into high-yielding transgenic strains. The present article discusses about the use of nanotechnology and genetic engineering approach for improved lipid accumulation in microalgae for biodiesel production.

A novel process economics risk model applied to biodiesel production system

2018 ◽  
Vol 118 ◽  
pp. 615-626 ◽  
Author(s):  
Zaman Sajid ◽  
Faisal Khan ◽  
Yan Zhang
Keyword(s):  
Production System ◽  
Risk Model ◽  
Biodiesel Production ◽  
Process Economics

scholarly journals Progress of Microalgal Biodiesel Research in Pakistan

2018 ◽  
pp. 1-6
Author(s):  
Yue Shi ◽  
Keyword(s):  
Algal Biomass ◽  
Fossil Fuels ◽  
Government Support ◽  
Energy Resources ◽  
Biodiesel Production ◽  
Future Perspectives ◽  
Compressed Natural Gas ◽  
Local Resources ◽  
Microalgal Biodiesel ◽  
Production Technologies

Excessive use of fossil fuels has led to severe energy calamity and environmental pollution in the world. The effect can be mitigated by shifting from conventional fuels to biofuel which may become a replacement of fuels such as diesel, gasoline and Compressed Natural Gas (CNG). Algal biomass is considered as one of the most promising and emerging sources of biodiesel production. Technologies related to biodiesel production using algal biomass have gained initial foothold in Pakistan but have failed miserably in gaining necessary momentum due to lack of government support to technology. The aim of this study is to indicate the progress and future perspectives of biodiesel production in Pakistan through microalgae. The study indicates that a microalgae is one of the best candidates for biodiesel production in addition to other energy crops like Jatropha, Castor and Pongamia Pinnata. There is a need to expeditiously develop biodiesel technology using local resources to lower the burden of imports on country’s economy while also bringing security of energy resources.

scholarly journals Nitrogen Deficiency in Culture Affects the Metabolic Pathways in Amphora Coffeaeformis for Biodiesel Production

2021 ◽  
Author(s):  
Kang Wang ◽  
Yulin Cui ◽  
Chunxiao Meng ◽  
Zhengquan Gao ◽  
Song Qin
Keyword(s):  
Molecular Mechanism ◽  
Lipid Accumulation ◽  
Ribosome Biogenesis ◽  
Carbon Fixation ◽  
Nitrogen Deficiency ◽  
Raw Material ◽  
Biodiesel Production ◽  
Microalgal Biodiesel ◽  
Amphora Coffeaeformis ◽  
Tag Accumulation

Abstract Background: Amphora coffeaeformis, a unicellular diatom, can accumulate large amounts of lipids under nitrogen (N) limitation, because of which it can act as a promising raw material for biodiesel production. However, the molecular mechanism underlying lipid accumulation in A. coffeaeformis remains unknown. Results: In this study, we investigated the mechanism underlying lipid accumulation under N deprivation conditions in A. coffeaeformis using RNA-seq. The results showed that the total lipid (TL) content of A. coffeaeformis in normal f/2 medium was 28.22% (TL/DW), which increased to 44.05% after 5 days of N deprivation, while the neutral lipid triacylglycerol (TAG) content increased from 10.41% (TAG/DW) to 25.21%. The transcriptional profile showed that 591 genes were up-regulated, with false discovery rate cutoff of 0.1%, and 1,021 genes were down-regulated, indicating that N deprivation induced wide-ranging reprogramming of regulation, and that most physiological activities were repressed. In addition, ribosome biogenesis, carbon fixation, and photosynthesis in A. coffeaeformis were considerably affected by N deprivation. Conclusions: In summary, the findings initially clarified the molecular mechanism of TAG accumulation and revealed the key genes involved in lipid metabolism in A. coffeaeformis, which will be useful in designing strategies for improving microalgal biodiesel production.

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