Biorecovery of nutrient waste as protein in freshwater macroalgae

Cole, Andrew J., De Nys, Rocky, and Paul, Nicholas A. (2015) Biorecovery of nutrient waste as protein in freshwater macroalgae. Algal Research, 7 (2015). pp. 58-65.

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Abstract

Over 150 million tonnes of protein are consumed annually by domesticated animals and this demand is expected to double by 2050. Freshwater macroalgae are a group of organisms that could contribute significantly to these future protein requirements as they can be cultured on-site, utilising the nutrient waste water from animal production. The aims of this study were to investigate the relationship between nitrogen supply, biomass productivity and the quantity and quality of protein in the freshwater macroalga, Oedogonium, cultured in situ in the waste water from an intensive freshwater fish farm. The dry weight (DW) productivity of Oedogonium ranged between 23.9 and 35.7 g·m^−2·day^−1, whilst on an ash free basis the rate of productivity ranged between 17.1 and 23.6 g·m^−2·day. These productivities are the highest documented for freshwater macroalgae. The protein content (sum of amino acids) of this biomass increased linearly with increasing nitrogen content of the biomass from a minimum of 3.96 g·100 g^−1 DW when the internal nitrogen content was 0.86%, to a maximum of 18.07 g·100 g^−1 DW when the nitrogen content was 4.16%. The quality of the protein in Oedogonium was high, with the essential amino acids accounting for 43.1–43.8% of the total amino acids. Methionine accounted for between 1.6 and 1.9%, and lysine 6.8 and 7.3% of this protein, with the proportion of each slightly increasing as the internal nitrogen content of the biomass decreased. The quantity and quality of protein in the Oedogonium biomass in this study are equivalent to, or higher than, many terrestrial crops that are currently used as a protein source in animal feeds. As such, integrating the production of Oedogonium into the waste management of intensive animal production will provide a mechanism to recover nutrients which, firstly, delivers a novel source of protein for the agricultural sector and, secondly, contributes to the environmental sustainability of intensive animal production through bioremediation.

Item ID: 37194
Item Type: Article (Research - C1)
ISSN: 2211-9264
Keywords: Oedogonium,bioremediation, amino acids, methionine, lysine, nitrogen
Funders: Australian Government through the Australian Renewable Energy Agency, ustralian Government's Cooperative Research Centre Scheme (CRCS)
Projects and Grants: ARENA 002369, CRCS DP109602
Date Deposited: 26 Jun 2015 02:06
FoR Codes: 10 TECHNOLOGY > 1002 Environmental Biotechnology > 100203 Bioremediation @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 25%
10 TECHNOLOGY > 1003 Industrial Biotechnology > 100302 Bioprocessing, Bioproduction and Bioproducts @ 25%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960912 Urban and Industrial Water Management @ 50%
82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8203 Industrial Crops > 820399 Industrial Crops not elsewhere classified @ 50%
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