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Stabilization of Stored Microalgae and Co-product Formation

Idaho National Laboratory

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Technology Marketing Summary

Many valuable products, such as energy-dense fuels, can be synthesized from microalgae-derived biomass. However, microalgae are extremely sensitive and susceptible to degradation after harvesting. This generally creates a narrow window of opportunity to process the harvested microalgae into marketable products. This challenge is further complicated by seasonal variability in microalgae production rates due to changes in temperature, sunlight, etc.  Peak microalgae production commonly occurs during summer months.  Microalgae produced in the summer that is in excess of processing capacity must be stored for later use.

A number of microalgae storage options have been explored, but each presents serious problems. Drying preserves most of the biomass, but is an energy intensive option that significantly increases the cost of biofuel production. Ensilage of microalgae avoids the high energy cost of drying, but the biomass degrades under storage conditions, resulting in significantly reduced biofuel yields.

 

 

Description

Researchers at INL have developed methods for storing concentrations of microalgae-derived biomass with much lower dry matter loss than under previously explored ensilage techniques. This method has also demonstrated production of significant volumes of bio-succinic acid and hydrogen, which would enhance the value of the stored algae and can result in secondary revenue streams for producers. This minimal dry matter loss, combined with the co-product formation, helps offset storage costs and enables economically viable, short- or long-term storage (1-6 months) of microalgae for later conversion.

 

Benefits
  • Significantly less expensive than storage through drying (65% drying cost on a $/liter diesel produced basis) [2]
  • Decreased microalgae loss (demonstrated 5-15% after 30 days of storage compared to typical wet storage losses of 8-37%) [1]
  • Organic acid production, particularly succinic acid, a valuable bio product and intermediate. Highest demonstrated yield was 0.34 g/g sugar in the algae [internal report]
  • Useful gas production, including hydrogen
  • 4.8 to 11% increased diesel production (based on theoretical cost analyses) [2]

 

Applications and Industries
  • Microalgae biomass production and storage
  • Bio-Succinic acid production

 

More Information

This technology has been tested and validated at the bench scale. Additional development will be required to demonstrate a pilot scale process.
 

Publications:

  1. Report: “Evaluation of a high-moisture stabilization strategy for harvested microalgae blended with herbaceous biomass: Part I—Storage performance,” INL quarterly report, 2014
  2. Paper: “Evaluation of a high-moisture stabilization strategy for harvested microalgae blended with herbaceous biomass: Part II — Techno-economic assessment,” Algal Research, 2017
  3. Paper: “Managing variability in algal biomass production through drying and stabilization of feedstock blends,” Algal Research, Vol 24, Part A, June 2017, pp 9-18

 

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Application 20180305656
Application
20180305656
METHODS OF PRESERVING A MICROALGAE BIOMASS AND A PRESERVED MICROALGAE BIOMASS
A method of preserving a biomass. The method comprises adding an acid solution to a biomass comprising microalgae to form an acidified microalgae biomass composition. The acidified microalgae biomass composition is stored under anaerobic conditions without inoculating the acidified microalgae biomass composition with bacteria. An additional method of preserving a biomass comprises storing the acidified microalgae biomass composition under anaerobic conditions and exposing the acidified microalgae biomass composition to carbon dioxide, nitrogen, or a combination thereof to produce a coproduct comprising succinic acid. Yet another method of preserving a biomass comprises storing the acidified microalgae biomass composition under anaerobic conditions and in the presence of carbon dioxide. A preserved biomass is also disclosed.
Idaho National Laboratory 04/24/2017
Filed
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
BA-914DevelopmentAvailable06/28/201806/28/2018

Contact INL About This Technology

To: Ryan Bills<Ryan.Bills@inl.gov>