Filtration of Nordic recirculating aquaculture system wastewater: Effects on microalgal growth, nutrient removal, and nutritional value

Microalgal bioremediation of recirculating aquaculture system (RAS) wastewater represents an alternative for treatment with the potential to generate valuable biomass. This study evaluated effects removing biological contamination and suspended solids from Nordic area RAS through filtration 0.45 μm filters on performance nutritional value microalgae. All three tested green microalgae (Haematococcus pluvialis, Monoraphidium griffithii, Selenastrum sp.) were able grow in raw (unfiltered) filtered wastewater. Cultivation decreased ω-3 ω-6 fatty acid content H. pluvialis as compared wastewater, while no differences cell density, nutrient removal, or amino contribution seen any between treatments. Filtration significantly reduced actinobacterial biomarkers microalgal cultures The difference was species-specific. Our results suggest that careful selection species, can be used production high-quality biomass further applications, such feeds, need remove indigenous contaminants solids.