Influence of operating conditions for volatile fatty acids enrichment as a first step for polyhydroxyalkanoate production on a municipal waste water treatment plant.

Abstract

This work describes the generation of volatile fatty acids (VFAs) as the first step of the polyhydroxyalkanoate (PHA) production cycle. Therefore four different substrates from a municipal waste water treatment plant (WWTP) were investigated regarding high VFA production and stable VFA composition. Due to its highest VFA yield primary sludge was used as substrate to test a series of operating conditions (temperature, pH, retention time (RT) and withdrawal (WD)) in order to find suitable conditions for a stable VFA production. The results demonstrated that although the substrate primary sludge differs in its consistence a stable composition of VFA could be achieved. Experiments with a semi-continuous reactor operation showed that a short RT of 4d and a small WD of 25% at pH=6 and around 30°C is preferable for high VFA mass flow (MF=1913 mg VFA/(Ld)) and a stable VFA composition.

DOI: 10.1016/j.biortech.2013.08.148

Cite this paper

@article{Pittmann2013InfluenceOO, title={Influence of operating conditions for volatile fatty acids enrichment as a first step for polyhydroxyalkanoate production on a municipal waste water treatment plant.}, author={Timo Pittmann and Heidrun Steinmetz}, journal={Bioresource technology}, year={2013}, volume={148}, pages={270-6} }