Bio-electrochemically extracted nitrogen from residual resources for microbial protein production

Upcycling of nutrients from residual resources for producing microbial protein (MP) is an attractive method to valorize residues. In this study, we investigated bio-electrochemical methods recover ammonia-N, further production MP. Reject water and digestate were used ammonia-N recovery in fuel cell (MFC) system. one-stage process, was 32 – 42% with 57 154 kJ/m3 waste stream electricity generation. For enhancing efficiency, a two-stage process developed, achieving efficiency 53 61%. Subsequently, MP grown the extracted amino acid concentration 421 272 mg/L under 25 °C 35 °C, respectively. Similar essential content (especially °C) one fish demonstrated attractiveness upcycling residues proteins. Based on simplified economic evaluation, produced energy performed potential catch 1.63 6.54 €/m3 stream.