Percorrer por autor "Corrêa, Diego de Oliveira"
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- Innovative approach in sustainable agriculture: harnessing microalgae potential via subcritical water extractionPublication . Ferreira, Alice; Vladić, Jelena; Corrêa, Diego de Oliveira; Butzke, Valéria Louzada Leal; Martins, Pedro L.; Ribeiro, Belina; Marques-dos-Santos, Cláudia; Acién, F. Gabriel; Gouveia, LuisaMicroalgae can contribute to sustainable agriculture and wastewater treatment. This study investigated Tetradesmus obliquus, , grown in piggery wastewater (To-PWW), as a biostimulant/ biofertilizer compared to biomass grown in synthetic medium (To-B). Subcritical water extraction was tested for disruption/hydrolysis of wet biomass, at three temperatures (120, 170, and 220 degrees C) and two biomass loads (1:10 and 1:80 (g dry biomass/mL water)). Extracts were evaluated for germination, and root formation/expansion. Residues were quantified for nutrient composition to assess their biofertilizer potential and tested for their affinity to oil compounds for bioremediation. The best germination was achieved by To-B extracts at 170 degrees C (1:10: 148% at 0.2 g/L, 1:80: 145% at 0.5 g/L). Only To-PWW extracts at 0.2 g/L had a significant germination effect (120 degrees C: 120-123 % for both loads; 170 degrees C: 115% for 1:80). To-PWW extract at 120 degrees C and 1:10 significantly affected cucumber and mung bean root formation (224 and 268%, respectively). Most extracts significantly enhanced root expansion, with all To-B extracts at 1:10 showing the best results (139-181 %). The residues contained essential nutrients (NPK), indicating their biofertilizer potential, helping decrease synthetic fertilizers demands. To-B residues had high affinity to toluene and diesel but lower to used cooking and car oils. To-PWW showed very low affinity to all oil compounds. Finally, all residues were only able to form stable emulsions with the used car oil. This study fully exploits the use of microalgal biomass in sustainable agriculture, producing biostimulant extracts, and residues for biofertilizer and bioremediation, from a low-cost wastewater source.
- Innovative approach in sustainable agriculture: harnessing microalgae potential via subcritical water extractionPublication . Ferreira, Alice; Vladić, Jelena; Corrêa, Diego de Oliveira; Butzke, Valéria Louzada Leal; Martins, Pedro L.; Ribeiro, Belina; Marques-dos-Santos, Cláudia; Acién, F. Gabriel; Gouveia, LuisaMicroalgae can contribute to sustainable agriculture and wastewater treatment. This study investigated Tetradesmus obliquus, grown in piggery wastewater (To-PWW), as a biostimulant/ biofertilizer compared to biomass grown in synthetic medium (To-B). Subcritical water extraction was tested for disruption/hydrolysis of wet biomass, at three temperatures (120, 170, and 220 ◦C) and two biomass loads (1:10 and 1:80 (g dry biomass/mL water)). Extracts were evaluated for germination, and root formation/expansion. Residues were quantified for nutrient composition to assess their biofertilizer potential and tested for their affinity to oil compounds for bioremediation. The best germination was achieved by To-B extracts at 170 ◦C (1:10: 148 % at 0.2 g/L, 1:80: 145 % at 0.5 g/L). Only To-PWW extracts at 0.2 g/L had a significant germination effect (120 ◦C: 120–123 % for both loads; 170 ◦C: 115 % for 1:80). To-PWW extract at 120 ◦C and 1:10 significantly affected cucumber and mung bean root formation (224 and 268 %, respectively). Most extracts significantly enhanced root expansion, with all To-B extracts at 1:10 showing the best results (139–181 %). The residues contained essential nutrients (NPK), indicating their biofertilizer potential, helping decrease synthetic fertilizers demands. To-B residues had high affinity to toluene and diesel but lower to used cooking and car oils. To-PWW showed very low affinity to all oil compounds. Finally, all residues were only able to form stable emulsions with the used car oil. This study fully exploits the use of microalgal biomass in sustainable agriculture, producing biostimulant extracts, and residues for biofertilizer and bioremediation, from a low-cost wastewater source.
- Integrating constructed wetlands, microbial fuel cells, and microalgal photobioreactors for sustainable piggery wastewater treatmentPublication . Corrêa, Diego de Oliveira; Ferreira, Alice; Ribeiro, Belina; Murthy, Karan; Ganguly, Anasuya; Mutnuri, Srikanth; Gouveia, LuisaPig farming generates high-strength piggery wastewater (PWW) with extreme organic and nutrient concentrations. This research evaluated an integrated treatment system combining Vertical Flow Constructed Wetlands (VFCW), Microbial Fuel Cells (MFC), and Microalgae Photobioreactors (PBR) to enhance resource recovery, evaluate bio-electrochemical activity, and produce microalgal biomass. Findings showed that hydraulic saturation in the VFCW–MFC stage enhanced the open-circuit voltage response, reaching a maximum of 539 mV, indicative of bio-electrochemical activity. The optimized VFCW–MFC configuration, featuring pulsed feeding, achieved removals of total suspended solids (TSS, 83%) and chemical oxygen demand (COD, 69%). This integrated pretreatment mitigated ammonia toxicity and turbidity, enabling the subsequent cultivation of Tetradesmus obliquus microalga, reaching biomass yields of 1.1–1.3 g L−1 while providing crucial tertiary polishing. Overall, the combined VFCW–MFC–PBR system achieved removal efficiencies exceeding 90% for total Kjeldahl nitrogen (TKN) and approximately 80% for COD. This synergistic approach successfully transforms PWW liabilities into valuable assets, including nutrient-rich biomass and bio-electrochemical activity, underscoring the potential of VFCW–MFC–PBR for sustainable wastewater management.