260026 Comparing Performance and Re-Acclimation of Two Phase Partitioning Bioreactor and Ordinary Bioreactor Under Starvation Period

Wednesday, October 31, 2012
Hall B (Convention Center )
Amin Yoosefi Booshehri, Chemical and biomedical engineering, NTU, Singapore, Singapore

Biological treatment plants operated for the removal of pollutants from waste streams are often exposed to periods of no chemical load (starvation periods). The length of such periods can range from a few hours (due to facility operation for a fraction of the day) to a few weeks or months (shut down for factory retooling, equipment maintenance, holiday breaks, process changes) and can negatively affect the elimination capacity of biological processes In the present study, we compare the performance of a two phase partitioning bioreactor(TPPB) and an ordinary bioreactor (OB) after being exposed to hexane starvation period. In OB, after 3 of days starvation period the removal efficiency was reduced by 99%, and about 6 days were needed to recover the initial removal efficiency when the hexane feeding resumed. In contrast, in the TPPB the hexane removal efficiency was not changed significantly and recovered to its initial removal efficiency within 10 hours. The results of this study show that the TPPB system can effectively sustain the biological treatment of waste gas during starvation periods of hydrophobic pollutants.


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See more of this Session: Poster Session: Sustainability and Sustainable Biorefineries
See more of this Group/Topical: Sustainable Engineering Forum