A fermentation process was established to produce VFAs from the OFMSW and the PS combined with OFMSW.
The OFMSW FL was produced in a 3 L fermenter at a controlled temperature of 37 C and pH of 5.0. The OFMSW was previously grinded and diluted with SBR effluent up to 6% TS (total solids). The fermenter organic loading rate (OLR) was 20 kgTVS m3 d1 (total volatile solids) and the hydraulic retention time (HRT) was 3 days.
For the production of PS & OFMSW FL the following procedure was applied: PS was mixed with OFMSW in a fermenter of 10 L at room temperature (25 C) with a ratio of 0.8 g OFMSW L1 PS and at HRT of 8.7 days.
The separation of the liquid and solid stream was performed by centrifugation. The supernatant was then fed to SBR and to the PHA accumulation reactor.