Journal article

Inhibition by fatty acids during fermentation of pre-treated waste activated sludge

S Pratt, D Liew, DJ Batstone, AG Werker, F Morgan-Sagastume, PA Lant

Journal of Biotechnology | ELSEVIER SCIENCE BV | Published : 2012


Fermentation of waste activated sludge produces volatile fatty acids (VFAs), which can be used as the carbon sources for numerous biological processes. However, product inhibition can limit extent of fermentation to VFAs. In this study, product inhibition during fermentation of waste activated sludge pre-treated by a thermal hydrolysis process (THP-WAS) was investigated. Product inhibition was confirmed as spiking reactors with high levels of a mix of VFAs prevented fermentation taking place. Various inhibition models were trialled and it was found that a threshold model (based on thermodynamics) provided the best fit between model and data. This is the first time that threshold type inhibit..

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Awarded by EU Commission

Awarded by ARC

Funding Acknowledgements

This work was conducted within the European Union's Sixth Framework Neptune project (FP6-2005-Global-4;), which was financially supported by grants obtained from theAustralian Government's Department of Innovation, Industry, Science and Research (International Science Linkages program) and the EU Commission (Contract no. 036845, SUSTDEV-2005-3.II.3.2). Dr Damien Batstone holds an Australian Research Fellowship (ARC Discovery Project number DP0985000).