Journal
BIORESOURCE TECHNOLOGY
Volume 159, Issue -, Pages 342-354Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.02.113
Keywords
Algae; Bioflocculation; Raceway pond; Aquaculture wastewater; Biomass
Funding
- INTERREG IVB NWE Programme
- Flemish Government
- Province West-Flanders
- Howest and Ghent University LIWET within the EnAlgae project
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Sequencing batch reactors with microalgal bacterial flocs (MaB-floc SBRs) are a novel approach for photosynthetic aerated wastewater treatment based on bioflocculation. To assess their technical potential for aquaculture wastewater treatment in Northwest Europe, MaB-floc SBRs were up-scaled from indoor photobioreactors of 4 L over 40 and 400 L to a 12 m(3) outdoor raceway pond. Scale-up decreased the nutrient removal efficiencies with a factor 1-3 and the volumetric biomass productivities with a factor 10-13. Effluents met current discharge norms, except for nitrite and nitrate. Flue gas sparging was needed to decrease the effluent pH. Outdoor MaB-flocs showed enhanced settling properties and an increased ash and chlorophyll a content. Bioflocculation enabled successful harvesting by gravity settling and dewatering by filtering at 150-250 lm. Optimisation of nitrogen removal and biomass valorisation are future challenges towards industrial implementation of MaB-floc SBRs for aquaculture wastewater treatment. (C) 2014 Elsevier Ltd. All rights reserved.
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