期刊
ENERGIES
卷 14, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/en14010038
关键词
polyhydroxyalkanoates; feed; aquaculture; anaerobic digestion; single cell protein
资金
- Join Project 2018 Study of a biorefinery for the production of VFA, biogas, and PHA from agro-residues - University of Verona
This study investigated the production of PHA-rich microbial biomass as a novel feed additive in aquaculture using bio-based VFAs obtained from acidogenic fermentation of agricultural residues. The economic analysis showed potential for higher benefits compared to biogas production through anaerobic digestion.
In this study, the production of polyhydroxyalkanoated PHA-rich microbial biomass as a novel feed additive in aquaculture was investigated at a lab-scale. Bio-based volatile fatty acids (VFAs), obtained from the acidogenic fermentation of agricultural residues in existing anaerobic digestion plants, were used as carbon and energy to cultivate the PHA-rich microbial biomass. The experimental activities were carried out using Thauera sp. Sel9 as pure strain, which was grown in a continuous stirred-tank reactor (CSTR) operated at three different hydraulic retention times (HRT). The highest productivity obtained of biomass cells was 0.69 g/L day, operating at one day HRT while the observed PHAs production yield was 0.14 gPHA/g soluble COD removed. At these conditions, the PHA concentration in the microbial cells was 41%. Although the sulfur amino acids were available at high concentrations and above the typical concentration found in fishmeal, the amino acids profile of the obtained biomass revealed a lack of histidine and threonine. A preliminary economic analysis showed that the production of a novel source of feed additive from the conversion of agro-residues could give higher benefits in terms of revenues compared to the production of biogas production through anaerobic digestion.
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