The rapidly growing aquaculture industry faces significant environmental challenges regarding wastewater discharge and eutrophication. Microalgal bioremediation offers a cost-effective alternative by recycling inorganic nitrogen and phosphorus into valuable biomass. This thesis evaluated the suitability of immobilized Nannochloropsis oceanica(CCMP1779) and Tetraselmis convolutae (BS14) for concurrent nutrient removal and biomass production under two photoperiods (12:12 and 24:0 Light:Dark). Tested in both batch and continuous flow configurations, both strains exhibited robust growth and rapid nutrient clearance. Continuous illumination significantly accelerated nitrogen removal and drastically enhanced phosphate clearance compared to the diurnal cycle. In continuous operation and light, the system achieved sustained long-term nutrient removal, though extended light exposure eventually induced cell photooxidation. Downstream lipid analysis revealed a high proportion of unsaturated fatty acids, indicating biomass-limited suitability for biodiesel production; however, culture conditions require further optimization to improve the fuel profile. In conclusion, this study proves that continuous illumination optimizes microalgal nutrient uptake from aquaculture wastewater. Ultimately, the positive profile of T. convolutae (BS14) offers a sustainable, circular, and localized bioremediation alternative for managing aquaculture wastewater in Naples.
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