Macroalgae supercritical water gasification combined with nutrient recycling for microalgae cultivation

Ramzi Cherad; J. A. Onwudili; U. Ekpo; P. T. Williams; A. R. Lea-Langton; M. Carmargo-Valero; A. B. Ross

doi:10.1002/ep.11814

Macroalgae supercritical water gasification combined with nutrient recycling for microalgae cultivation

Ramzi Cherad, J. A. Onwudili, U. Ekpo, P. T. Williams, A. R. Lea-Langton, M. Carmargo-Valero, A. B. Ross^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The composition of syngas and process water from the supercritical water gasification of macroalgae has been investigated. The potential for using the process water as a source of nutrients for microalgae cultivation was assessed. Saccharina latissima, harvested across the four seasons was gasified in a batch reactor at 500°C and 36 MPa to assess the influence of biochemical content and ash on syngas composition. In addition, summer harvests of four different macroalga were gasified with ruthenium catalyst (Ru/Al₂O ₃). The molar yields of hydrogen and C₁-C₄ gases from S. latissima increased by 30% in the presence of Ru/Al ₂O₃ with a maximum gasification efficiency of 92% compared with work without these catalysts. Following a series of dilutions, the process water from catalyzed gasification of S. latissima was used in cultivation trials of Chlorella vulgaris and compared to standard growth media. The results indicate the potential to recover process waters from gasification of macroalgae in nutrient management for microalgae. © 2013 American Institute of Chemical Engineers Environ Prog, 32: 902-909, 2013

Original language	English
Pages (from-to)	902-909
Number of pages	8
Journal	Environmental Progress and Sustainable Energy
Volume	32
Issue number	4
Early online date	11 Sept 2013
DOIs	https://doi.org/10.1002/ep.11814
Publication status	Published - Dec 2013

Keywords

algal bio-refinery
hydrothermal gasification
macroalgae
nutrient recycling
seaweeds

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title = "Macroalgae supercritical water gasification combined with nutrient recycling for microalgae cultivation",

abstract = "The composition of syngas and process water from the supercritical water gasification of macroalgae has been investigated. The potential for using the process water as a source of nutrients for microalgae cultivation was assessed. Saccharina latissima, harvested across the four seasons was gasified in a batch reactor at 500°C and 36 MPa to assess the influence of biochemical content and ash on syngas composition. In addition, summer harvests of four different macroalga were gasified with ruthenium catalyst (Ru/Al2O 3). The molar yields of hydrogen and C1-C4 gases from S. latissima increased by 30% in the presence of Ru/Al 2O3 with a maximum gasification efficiency of 92% compared with work without these catalysts. Following a series of dilutions, the process water from catalyzed gasification of S. latissima was used in cultivation trials of Chlorella vulgaris and compared to standard growth media. The results indicate the potential to recover process waters from gasification of macroalgae in nutrient management for microalgae. {\textcopyright} 2013 American Institute of Chemical Engineers Environ Prog, 32: 902-909, 2013",

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AU - Cherad, Ramzi

AU - Onwudili, J. A.

AU - Ekpo, U.

AU - Williams, P. T.

AU - Lea-Langton, A. R.

AU - Carmargo-Valero, M.

AU - Ross, A. B.

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AB - The composition of syngas and process water from the supercritical water gasification of macroalgae has been investigated. The potential for using the process water as a source of nutrients for microalgae cultivation was assessed. Saccharina latissima, harvested across the four seasons was gasified in a batch reactor at 500°C and 36 MPa to assess the influence of biochemical content and ash on syngas composition. In addition, summer harvests of four different macroalga were gasified with ruthenium catalyst (Ru/Al2O 3). The molar yields of hydrogen and C1-C4 gases from S. latissima increased by 30% in the presence of Ru/Al 2O3 with a maximum gasification efficiency of 92% compared with work without these catalysts. Following a series of dilutions, the process water from catalyzed gasification of S. latissima was used in cultivation trials of Chlorella vulgaris and compared to standard growth media. The results indicate the potential to recover process waters from gasification of macroalgae in nutrient management for microalgae. © 2013 American Institute of Chemical Engineers Environ Prog, 32: 902-909, 2013

KW - algal bio-refinery

KW - hydrothermal gasification

KW - macroalgae

KW - nutrient recycling

KW - seaweeds

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Macroalgae supercritical water gasification combined with nutrient recycling for microalgae cultivation

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