TY - JOUR
T1 - Bio-electrochemically extracted nitrogen from residual resources for microbial protein production
AU - Yanga, Ziyi
AU - Tsapekos, Panagiotis
AU - Zhang, Yifeng
AU - Zhang, Yi
AU - Angelidaki, Irini
AU - Wang, Wen
PY - 2021
Y1 - 2021
N2 - 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 to recover ammonia-N, for further production of MP. Reject water and digestate were used for ammonia-N recovery in microbial fuel cell (MFC) system. In one-stage process, ammonia-N recovery was 32 – 42% with 57 – 154 kJ/m3 waste stream of electricity generation. For further enhancing recovery efficiency, a two-stage process was developed, achieving efficiency of 53 – 61%. Subsequently, MP was grown with the extracted ammonia-N, and amino acid concentration was 421 and 272 mg/L under 25 °C and 35 °C, respectively. Similar essential amino acid content of MP (especially under 25 °C) with the one from fish demonstrated the attractiveness of upcycling residues to proteins. Based on simplified economic evaluation, the produced energy performed the potential to catch 1.63 – 6.54 €/m3 waste stream
AB - 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 to recover ammonia-N, for further production of MP. Reject water and digestate were used for ammonia-N recovery in microbial fuel cell (MFC) system. In one-stage process, ammonia-N recovery was 32 – 42% with 57 – 154 kJ/m3 waste stream of electricity generation. For further enhancing recovery efficiency, a two-stage process was developed, achieving efficiency of 53 – 61%. Subsequently, MP was grown with the extracted ammonia-N, and amino acid concentration was 421 and 272 mg/L under 25 °C and 35 °C, respectively. Similar essential amino acid content of MP (especially under 25 °C) with the one from fish demonstrated the attractiveness of upcycling residues to proteins. Based on simplified economic evaluation, the produced energy performed the potential to catch 1.63 – 6.54 €/m3 waste stream
KW - ammonia-N recovery
KW - Microbial fuel cell
KW - Microbial protein
KW - Methane oxidizing bacteria
KW - Temperature
U2 - 10.1016/j.biortech.2021.125353
DO - 10.1016/j.biortech.2021.125353
M3 - Journal article
C2 - 34116279
SN - 0960-8524
VL - 337
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 125353
ER -