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Energy production from marine biomass (Ulva lactuca)

Abstract

In this project, methods for producing liquid, gaseous and solid biofuel from the marine macroalgae Ulva lactuca has been studied. To get an understanding of the growth conditions of Ulva lactuca, laboratory scale growth experiments describing N, P, and CO{sub 2} uptake and possible N{sub 2}O and CH{sub 4} production are carried out. The macroalgae have been converted to bioethanol and methane (biogas) in laboratory processes. Further the potential of using the algae as a solid combustible biofuel is studied. Harvest and conditioning procedures are described together with the potential of integrating macroalgae production at a power plant. The overall conclusions are: 1. Annual yield of Ulva lactuca is 4-5 times land-based energy crops. 2. Potential for increased growth rate when bubbling with flue gas is up to 20%. 3. Ethanol/butanol can be produced from pretreated Ulva of C6 and - for butanol - also C5 sugars. Fermentation inhibitors can possibly be removed by mechanical pressing. The ethanol production is 0,14 gram pr gram dry Ulva lactuca. The butanol production is lower. 4. Methane yields of Ulva are at a level between cow manure and energy crops. 5. Fast pyrolysis produces algae oil which contains 78 % of the energy  More>>
Authors:
Nikolaisen, L; Daugbjerg Jensen, P; Svane Bech, K [1] 
  1. Danish Technological Institute (DTI), Taastrup (Denmark); and others
Publication Date:
Nov 15, 2011
Product Type:
Technical Report
Report Number:
NEI-DK-5779
Resource Relation:
Other Information: PSO-2008; 89 refs., 37 figs. 20 tabs.
Subject:
09 BIOMASS FUELS; ALGAE; BIOMASS; BIOFUELS; BIOETHANOL; BUTANOLS; METHANE; SOLID FUELS; CARBON DIOXIDE; UPTAKE; PLANT GROWTH
OSTI ID:
22006631
Research Organizations:
Danish Technological Institute, Taastrup (Denmark)
Country of Origin:
Denmark
Language:
English
Contract Number:
Contract FORSKEL 10050
Other Identifying Numbers:
TRN: DK1201287
Availability:
Commercial reproduction prohibited. Available from ETDE as OSTI ID: 22006631; Also available at http://www.risoe.dtu.dk/rispubl/NEI/NEI-DK-5779.pdf
Submitting Site:
DK
Size:
72 page(s)
Announcement Date:
Dec 22, 2012

Citation Formats

Nikolaisen, L, Daugbjerg Jensen, P, and Svane Bech, K. Energy production from marine biomass (Ulva lactuca). Denmark: N. p., 2011. Web.
Nikolaisen, L, Daugbjerg Jensen, P, & Svane Bech, K. Energy production from marine biomass (Ulva lactuca). Denmark.
Nikolaisen, L, Daugbjerg Jensen, P, and Svane Bech, K. 2011. "Energy production from marine biomass (Ulva lactuca)." Denmark.
@misc{etde_22006631,
title = {Energy production from marine biomass (Ulva lactuca)}
author = {Nikolaisen, L, Daugbjerg Jensen, P, and Svane Bech, K}
abstractNote = {In this project, methods for producing liquid, gaseous and solid biofuel from the marine macroalgae Ulva lactuca has been studied. To get an understanding of the growth conditions of Ulva lactuca, laboratory scale growth experiments describing N, P, and CO{sub 2} uptake and possible N{sub 2}O and CH{sub 4} production are carried out. The macroalgae have been converted to bioethanol and methane (biogas) in laboratory processes. Further the potential of using the algae as a solid combustible biofuel is studied. Harvest and conditioning procedures are described together with the potential of integrating macroalgae production at a power plant. The overall conclusions are: 1. Annual yield of Ulva lactuca is 4-5 times land-based energy crops. 2. Potential for increased growth rate when bubbling with flue gas is up to 20%. 3. Ethanol/butanol can be produced from pretreated Ulva of C6 and - for butanol - also C5 sugars. Fermentation inhibitors can possibly be removed by mechanical pressing. The ethanol production is 0,14 gram pr gram dry Ulva lactuca. The butanol production is lower. 4. Methane yields of Ulva are at a level between cow manure and energy crops. 5. Fast pyrolysis produces algae oil which contains 78 % of the energy content of the biomass. 6. Catalytic supercritical water gasification of Ulva lactuca is feasible and a methane rich gas can be obtained. 7. Thermal conversion of Ulva is possible with special equipment as low temperature gasification and grate firing. 8. Co-firing of Ulva with coal in power plants is limited due to high ash content. 9. Production of Ulva only for energy purposes at power plants is too costly. 10. N{sub 2}O emission has been observed in lab scale, but not in pilot scale production. 11. Analyses of ash from Ulva lactuca indicates it as a source for high value fertilizers. 12. Co-digestion of Ulva lactuca together with cattle manure did not alter the overall fertilization value of the digested cattle manure alone. (LN)}
place = {Denmark}
year = {2011}
month = {Nov}
}