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Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process

P. Biller, A.B. Ross, S.C. Skill, A. Lea-Langton, B. Balasundaram, C. Hall, R. Riley, C.A. Llewellyn, Steve Skill Orcid Logo

Algal Research, Volume: 1, Issue: 1, Pages: 70 - 76

Swansea University Author: Steve Skill Orcid Logo

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DOI (Published version): 10.1016/j.algal.2012.02.002

Abstract

Two major considerations of the emerging algae biofuel industry are the energy intensive dewatering of the algae slurry and nutrient management. The proposed closed loop process which involves nutrient recycling of the aqueous phase from the hydrothermal liquefaction of microalgae offers a solution...

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Published in: Algal Research
Published: 2012
URI: https://cronfa.swan.ac.uk/Record/cronfa28853
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spelling 2016-07-25T16:26:40.0374490 v2 28853 2016-06-13 Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process f7851c38f3019243981f40a4b271e7bb 0000-0001-6777-7488 Steve Skill Steve Skill true false 2016-06-13 SBI Two major considerations of the emerging algae biofuel industry are the energy intensive dewatering of the algae slurry and nutrient management. The proposed closed loop process which involves nutrient recycling of the aqueous phase from the hydrothermal liquefaction of microalgae offers a solution to both aspects. Hydrothermal liquefaction has been shown to be a low energy process for bio-crude production from microalgae. For the purpose of this research, microalgae strains of Chlorella vulgaris, Scenedesmus dimorphus and the cyanobacteria Spirulina platensis and Chlorogloeopsis fritschii were processed in batch reactors at 300°C and 350°C. Following liquefaction the product phases were separated and the water phase recovered. The bio-crude yields ranged from 27 to 47wt.%. The bio-crudes were of low O and N content and high heating value making them suitable for further processing. The water phase was analysed for all major nutrients, TOC and TN to determine the suitability of the recycled aqueous phase for algae cultivation. Growth trials were performed for each algae strain in a standard growth medium and compared to the growth rates in a series of dilutions of the recycled process water phase. Growth was determined by cell count and chlorophyll a absorbance. Growth occurred in heavy dilutions where the amount of growth inhibitors was not too high. The results show that the closed loop system using the recovered aqueous phase offers a promising route for sustainable oil production and nutrient management for microalgae. Journal Article Algal Research 1 1 70 76 31 12 2012 2012-12-31 10.1016/j.algal.2012.02.002 COLLEGE NANME Biosciences COLLEGE CODE SBI Swansea University 2016-07-25T16:26:40.0374490 2016-06-13T16:33:36.3283667 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Biosciences P. Biller 1 A.B. Ross 2 S.C. Skill 3 A. Lea-Langton 4 B. Balasundaram 5 C. Hall 6 R. Riley 7 C.A. Llewellyn 8 Steve Skill 0000-0001-6777-7488 9
title Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process
spellingShingle Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process
Steve Skill
title_short Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process
title_full Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process
title_fullStr Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process
title_full_unstemmed Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process
title_sort Nutrient recycling of aqueous phase for microalgae cultivation from the hydrothermal liquefaction process
author_id_str_mv f7851c38f3019243981f40a4b271e7bb
author_id_fullname_str_mv f7851c38f3019243981f40a4b271e7bb_***_Steve Skill
author Steve Skill
author2 P. Biller
A.B. Ross
S.C. Skill
A. Lea-Langton
B. Balasundaram
C. Hall
R. Riley
C.A. Llewellyn
Steve Skill
format Journal article
container_title Algal Research
container_volume 1
container_issue 1
container_start_page 70
publishDate 2012
institution Swansea University
doi_str_mv 10.1016/j.algal.2012.02.002
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Biosciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Biosciences
document_store_str 0
active_str 0
description Two major considerations of the emerging algae biofuel industry are the energy intensive dewatering of the algae slurry and nutrient management. The proposed closed loop process which involves nutrient recycling of the aqueous phase from the hydrothermal liquefaction of microalgae offers a solution to both aspects. Hydrothermal liquefaction has been shown to be a low energy process for bio-crude production from microalgae. For the purpose of this research, microalgae strains of Chlorella vulgaris, Scenedesmus dimorphus and the cyanobacteria Spirulina platensis and Chlorogloeopsis fritschii were processed in batch reactors at 300°C and 350°C. Following liquefaction the product phases were separated and the water phase recovered. The bio-crude yields ranged from 27 to 47wt.%. The bio-crudes were of low O and N content and high heating value making them suitable for further processing. The water phase was analysed for all major nutrients, TOC and TN to determine the suitability of the recycled aqueous phase for algae cultivation. Growth trials were performed for each algae strain in a standard growth medium and compared to the growth rates in a series of dilutions of the recycled process water phase. Growth was determined by cell count and chlorophyll a absorbance. Growth occurred in heavy dilutions where the amount of growth inhibitors was not too high. The results show that the closed loop system using the recovered aqueous phase offers a promising route for sustainable oil production and nutrient management for microalgae.
published_date 2012-12-31T03:35:13Z
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score 11.036116

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