PhD Defence Francisco Javier Rubio Rincon

  • 30 Jan 2017
  • 12:00 - 14:00
  • TU Delft Auditorium, Mekelweg 5, Frans van Hasselt room
Western Europe
Delft, The Netherlands

On 30 January 2017, the Public Defence and Awarding Ceremony of Francisco Javier Rubio Rincon will take place. Professor Damir Brdjanovic and Professor Mark van Loosdrecht are his promotors.

The title of the thesis is: 
Effect of Sulphide on Enhanced Biological Phosphorus Removal

12.00 - 12.15          Presentation on his thesis in the Auditorium of TU Delft

12.30 - 14.00          Public Defence and Ceremony

Summary thesis

The enhanced biological removal of phosphorus (EBPR) is a popular process due to high removal efficiency, low operational costs, and the possibility of phosphorus recovery. Nevertheless, the stability of the EBPR depends on different factors such as: temperature, pH, and the presence of toxic compounds. While extensive studies have researched the effects of temperature and pH on EBPR systems, little is known about the effects of different toxic compounds on EBPR. For example, sulphide has shown to inhibit different microbial activities in the WWTP, but the knowledge about its effects on EBPR is limited. Whereas the sulphide generated in the sewage can cause a shock effect on EBPR, the continuously exposure to sulphide potentially generated in WWTP can cause the acclimatization and adaptation of the biomass.

This research suggests that sulphate reducing bacteria can proliferate in WWTP, as they are reversibly inhibited by the recirculation of sludge through anaerobic-anoxic-oxic conditions. The research enhances the understanding of the effect of sulphide on the anaerobic-oxic metabolism of PAO. It suggests that the filamentous bacteria Thiothrix caldifontis could play an important role in the biological removal of phosphorus. It questions the ability of PAO to generate energy from nitrate respiration and its use for the anoxic phosphorus uptake. Thus, the results obtained in this research can be used to understand the stability of the EBPR process under anaerobic-anoxic-oxic conditions, especially when exposed to the presence of sulphide.