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Algal bioproducts derived from suspended solids in intensive land-based aquaculture

Castine, Sarah A., Paul, Nicholas A., Magnusson, Marie, Bird, Michael I., de Nys, Rocky
Bioresource technology 2013 v.131 pp. 113-120
biobased products, biochar, biomass, carbon, cation exchange capacity, fatty acid composition, nitrogen, pond culture, ponds
Land-based aquaculture produces suspended solids in culture pond and settlement pond waters that could be harvested as a bioresource. Suspended solids were quantified, characterised and harvested from these two sources to assess their suitability for conversion to bioproducts. The suspended solids of settlement ponds were less concentrated (87.6±24.7mgL−1) than those of culture ponds (131.8±8.8mgL−1), but had a higher concentration of microalgae (27.5±4.0%) and consequently higher particulate organic carbon (24.8±4.7%) and particulate nitrogen (4.0±0.8%). The microalgal community also differed between sources with a higher concentration of fatty acids in the biomass from settlement ponds. Consequently, biochar produced from biomass harvested from settlement ponds was higher in organic carbon and nitrogen, with a lower cation exchange capacity. In conclusion, we characterised a renewable and potentially valuable bioresource for algal bioproducts derived from suspended solids in intensive land-based aquaculture.