Journal
JOURNAL OF BIOTECHNOLOGY
Volume 192, Issue -, Pages 161-169Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jbiotec.2014.10.022
Keywords
Polyhydroxyalkanoates (PHA); Pilot-scale; Industrial wastewater; Bioplastic; Resource recovery
Categories
Funding
- Dutch Foundation for Technical Sciences (STW), Waste to Resource program [11605]
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A PHA producing microbial culture dominated by Plasticicumulans acidivorans was enriched in a pilot plant using fermented wastewater from the Mars candy bar factory. The pilot plant comprised (1) anaerobic fermentation, (2) enrichment of a PHA-producing microbial community and (3) accumulation for maximization of the cellular PHA content. After anaerobic fermentation, the wastewater contained mainly VFAs (0.64 +/- 0.15 gCOD/gCOD) and ethanol (0.22 +/- 0.13 gCOD/gCOD). In the enrichment reactor (cycle 12 h, SRT 24 h) a feast-famine pattern was established with a feast phase of around 35 +/- 5 min. The culture was able to accumulate 0.70 +/- 0.05 gPHA/gVSS. The difference with previous lab-scale results from P. acidivorans, in which a PHA content of 0.90 gPHA/gVSS was achieved, could be attributed to the presence of solids in the influent, the growth of a side population and the accumulation of non-PHA storage compounds that appeared to be related to ethanol consumption. (C) 2014 Elsevier B.V. All rights reserved.
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