Journal
BIORESOURCE TECHNOLOGY
Volume 334, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.124964
Keywords
Bioplastics; High salinity wastewater; Industrial wastewater; Mixed microbial cultures; Protein-rich waste streams
Funding
- Spanish Government (AEI) through TREASURE [CTQ2017-83225-C2-1-R]
- FEDER (EU)
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By adding Na(HCO3) and adjusting the order of the settling stage, the accumulation of PHA was successfully increased, ultimately producing more PHA from wastewater.
Saline Mussels Cooking Wastewater was valorised to produce PHA with Mixed Microbial Cultures (MMC). Due to the high protein content (1.8-5.7 g CODPROT/L), PHA accumulating capacity was below 10%, so several strategies were tested. In the acidification unit, Na(HCO3) was added, increasing protein conversion into Volatile Fatty Acids (VFA) from 10.3% to 69.2% and subsequent PHA accumulation from 6.9 to 14.7%. In the enrichment unit, the incorporation of a settling stage after the feast phase provoked a shift in the proteins' oxidation from the feast to the famine phase, where the nitrogen released in the famine is used by the MMC for growth. This increased the biomass concentration and the tolerated COD (from 1.6 to 4.2 g VSS/L and from 2.2 to 4.38 g COD/L). Finally, varying the proteins/VFA ratio for MMC acclimation to proteins allowed increasing PHA accumulation from 8.8 to 41.5%.
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