Microbial Poly-β-hydroxyalkanoate Accumulation from Wastewater Sludge for Plastic Production

Tutkimustuotos: KonferenssimateriaalitPosterivertaisarvioitu

Abstrakti

Treated wastewater sludge may contain harmful compounds that prevent its use as fertilizer. However, wastewater sludge carbon could be used to produce biodegradable plastic material called polydroxyalkanoates (PHAs), which could replace the traditional plastics made from fossil raw materials to reduce carbon dioxide emissions. This takes place in a two-step process. First, the sludge is hydrolysed into volatile fatty acids (VFAs), and then in the second step, bacteria enriched from the activated sludge convert the VFAs into PHAs in an aerated bioreactor. For the hydrolysis, pH values of 9, 7, 5, and no pH adjustment were tested in high volatile solid (VS) and high fixed solid (FS) bioreactors. Based on the VFAs yield, pH 7 was chosen for the sludge hydrolysis experiments. Three types of sludge (sludge after nitrogen removal, sludge for biogas production, and dewatered sludge) were hydrolysed at pH 7. The sludge intended for biogas production produced the maximum amount of VFAs (8861 ± 323 mg/L). In PHA accumulation, the feast-and-famine process was not suitable for converting VFAs to PHAs in the sludge with chemical phosphorus precipitation, but fermenter aeration had to be continued to cultivate PHA-accumulating microorganisms. The final PHA concentration was 80% of volatile solids.
Alkuperäiskielienglanti
Sivut1
Sivumäärä1
TilaJulkaistu - 5 lokak. 2022
OKM-julkaisutyyppiEi sovellu
TapahtumaEuropean Biotechnology Congress 2022 - Prague, Tšekki
Kesto: 5 lokak. 20227 lokak. 2022

Konferenssi

KonferenssiEuropean Biotechnology Congress 2022
Maa/AlueTšekki
KaupunkiPrague
Ajanjakso05/10/202207/10/2022

Tieteenalat

  • 11832 Mikrobiologia ja virologia

Siteeraa tätä