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Up-scaling aquaculture wastewater treatment by microalgal bacterial flocs: from lab reactors to an outdoor raceway pond.
- Source :
-
Bioresource technology [Bioresour Technol] 2014 May; Vol. 159, pp. 342-54. Date of Electronic Publication: 2014 Mar 06. - Publication Year :
- 2014
-
Abstract
- 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 μm. Optimisation of nitrogen removal and biomass valorisation are future challenges towards industrial implementation of MaB-floc SBRs for aquaculture wastewater treatment.<br /> (Copyright © 2014 Elsevier Ltd. All rights reserved.)
- Subjects :
- Batch Cell Culture Techniques instrumentation
Biodegradation, Environmental
Biological Oxygen Demand Analysis
Biomass
Electric Conductivity
Flocculation
Hydrogen-Ion Concentration
Nitrogen analysis
Oxygen analysis
Phosphorus analysis
Photons
Photosynthesis
Waste Disposal, Fluid
Wastewater microbiology
Aquaculture
Bacteria metabolism
Bioreactors microbiology
Microalgae metabolism
Ponds microbiology
Wastewater chemistry
Water Purification methods
Subjects
Details
- Language :
- English
- ISSN :
- 1873-2976
- Volume :
- 159
- Database :
- MEDLINE
- Journal :
- Bioresource technology
- Publication Type :
- Academic Journal
- Accession number :
- 24662311
- Full Text :
- https://doi.org/10.1016/j.biortech.2014.02.113