Click here for more information about Algenuity
Click here for more information about Liqofluxphenometrics515R1
Visit cricatalyst.com!Evodos Separation Technology

Research

Developing an integrated algal biorefinery

December 12, 2017
AlgaeIndustryMagazine.com

Microalgal biorefinery rendering. Credit: pmoaruba.com

Yogendra Shastri writes in sciencetrends.com about a recently published study that proposes an integrated biorefinery — co-producing fuel, a low-value high-volume product, with other value-added products such as protein, reduced sugar, and polar lipids – which are high value and low volume. The study, by Dr. Shastri and his research associates at Indian Institute of Technology Bombay, Mumbai, India, Soumyajit Sen Gupta and Sharad Bhartiya, appears in the journal Biofuels, Bioproducts and Biorefining.

In this study, an optimization model considering the production of biodiesel along with various value-added chemicals is developed. The various processing stages considered include cultivation of microalgae, harvesting, and drying, lipid extraction, followed by transesterification to produce biodiesel. Lipids may also be fractionated into individual classes. Lipid extracted microalgae may be used for extraction of protein and reduced sugar.

The constraints of the model include a mass balance among the various steps, along with equations governing equipment sizing, process synthesis, and economics. Amount of solution and quantity of biomass cultivated are some of the continuous variables whereas the number of equipment and number of batches are examples of integer variables in the model. Selection of alternatives is attained by binary variables. The optimization model is a Mixed Integer Linear Programming (MILP) and is developed in General Algebraic Modeling System (GAMS). The objective is to minimize the net Annualized Life Cycle Cost (ALCC) of producing a fixed amount of biodiesel.

The model is applied to a scenario with 30 Mg/d production target of biodiesel from phototrophic strains, with an upper bound on the demands for other value-added products. The biodiesel ALCC is US $ 8.53/L and reducing sugar is obtained as a co-product. This ALCC is 35% less than that when biodiesel is the only product of the refinery. Growth, performed in raceway ponds, is the most expensive step, accounting for 74% of the final biodiesel cost. The optimal flowsheet and operating strategy for each step are also recommended. Options such as supercritical lipid extraction and growth in photobioreactors are highly efficient for individual steps but are not optimal from a biorefinery perspective.

Several options to further reduce the biodiesel are explored. Co-cultivation of the phototrophic and heterotrophic strains reduces the ALCC by 10.2%. Optimal batch scheduling with infinite intermediate storage coupled with debottlenecking reduces the net ALCC by 25%. The integrated biorefinery is highly profitable if reducing sugar is the main product with unlimited demand. In such cases, a shorter microalgae growth cycle with higher carbohydrate fraction is preferred, and biodiesel becomes a side product. The comprehensive integrated model enables informed decision-making for the microalgae biorefinery.

Read More

More Like This…

Copyright ©2010-2019 AlgaeIndustryMagazine.com. All rights reserved. Permission required to reprint this article in its entirety. Must include copyright statement and live hyperlinks. Contact editorial@algaeindustrymagazine.com. A.I.M. accepts unsolicited manuscripts for consideration, and takes no responsibility for the validity of claims made in submitted editorial.

twittertopbarlinks_eventstopbarlinks_requesttopbarlinks_archives

From The A.I.M. Archives

— Refresh Page for More Choices
42 Technology has been appointed by LabXero, acoustic particle filtration technology company, to help develop pilot-scale biomanufacturing equipment that could significan...
Globally, an increase in water pollution is pushing scientists and environmental care specialists to seek best ways of preserving and maintaining sources of safe drinking...
The Algae Biomass Organization (ABO) reports the introduction of the Algae Agriculture Act of 2018 (H.R. 5373), a bill that would give algae cultivators and harvesters ma...
French researchers have been exploring the potential of algae for boosting the immune systems of animals and reducing the use of antibiotics in livestock farming. Past st...
At the Technical University of Denmark (DTU), Science Nordic.com reports, researchers are investigating bioluminescent algae, to determine whether bioluminescent organism...
Foodbev.com reports that French marine ingredients company Algaia will install a new specialty seaweed extract unit at its facility in Brittany, France, after securing €4...
Judith Lewis Mernit writes in e360.yale.edu that an experiment being conducted by animal science professor Ermias Kebreab at the University of California, Davis, is testi...
Milenio.com reports that BiomiTech, a Mexican company, won a prestigious innovation award for its air purification system at the Contamination Expo Series 2018 held in Bi...
Cécile Barbière writes for Euractive.fr (translated by Rob Kirby) that, in large greenhouses formerly home to the tomatoes and cucumbers of the market gardening Groupe Ol...
Nature.com reports that swimming algae have been enlisted to carry drugs to individual cells, raising the prospect that such “microswimmers” could deliver targeted therap...
E.A. Crunden writes in thinkprogress.org that Florida’s first gubernatorial debate was dominated by environmental and climate issues, with an emphasis on the state’s alga...
Jason Huffman writes in UndercurrentNews.com that the Kampachi Company, a mariculture business focused on expanding the environmentally sound production of sashimi-grade ...