Respirometry for the Characterization of Heterotrophic Biomass Activity: Application to a MBR Pilot Plant Operated with Two Different Start-Up Strategies
Publication: Journal of Environmental Engineering
Volume 142, Issue 2
Abstract
A membrane bioreactor (MBR) pilot plant was operated in two subsequent experimental periods (namely, Periods I and II) with different start-up and sludge withdrawal strategies to study its peculiar biokinetic behavior by using respirometric techniques. Two extreme operational conditions were chosen to investigate the different biomass activity under dynamic or pseudostationary conditions during and after the start-up phases. Particularly, the MBR pilot plant was operated with the same volumetric loading rate (VLR) and permeate flux but differently managed during the start-up phase. In Period I, the MBR pilot plant was started up without sludge inoculum and operated without sludge withdrawals; on the contrary, in Period II the MBR pilot plant was started up with sludge inoculum and operated with regular sludge withdrawals. The obtained results highlighted that the different start-up strategies significantly affected the value of the yield coefficient, the storage phenomena, the decay coefficient, and the maximum respiration rates of heterotrophic species. More specifically, both experimental periods underlined interesting aspects related to the bacterial behavior under significant stress conditions occurring during a non-steady-state (start-up) phase.
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 2 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jul 11, 2014
Accepted: Aug 11, 2015
Published online: Oct 27, 2015
Published in print: Feb 1, 2016
Discussion open until: Mar 27, 2016
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