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Processes 2017, 5(3), 41; doi:10.3390/pr5030041

Effects of Inoculum Type and Aeration Flowrate on the Performance of Aerobic Granular SBRs

1
Department of Sanitary and Environmental Engineering, Federal University of SantaCatarina-UFSC/CTC/ENS, CEP 88010 970 Florianópolis, SC, Brazil
2
Department of Chemical Engineering, School of Engineering, University of Santiago de Compostela, Lope Gómez de Marzoa s/n, E-15782 Santiago de Compostela, Spain
3
Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Avda Padre Hurtado 750, Viña del Mar 2520000, Chile
*
Author to whom correspondence should be addressed.
Received: 8 June 2017 / Revised: 13 July 2017 / Accepted: 14 July 2017 / Published: 19 July 2017
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Abstract

Aerobic granular sequencing batch reactors (SBRs) are usually inoculated with activated sludge which implies sometimes long start-up periods and high solids concentrations in the effluent due to the initial wash-out of the inoculum. In this work, the use of aerobic mature granules as inoculum in order to improve the start-up period was tested, but no clear differences were observed compared to a reactor inoculated with activated sludge. The effect of the aeration rate on both physical properties of granules and reactor performance was also studied in a stable aerobic granular SBR. The increase of the aeration flow rate caused the decrease of the average diameter of the granules. This fact enhanced the COD and ammonia consumption rates due to the increase of the DO level and the aerobic fraction of the biomass. However, it provoked a loss of the nitrogen removal efficiency due to the worsening of the denitrification capacity as a consequence of a higher aerobic fraction. View Full-Text
Keywords: aeration flowrate; aerobic granules; inoculum; sequencing batch reactor; wastewater aeration flowrate; aerobic granules; inoculum; sequencing batch reactor; wastewater
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Jungles, M.K.; Val del Río, Á.; Mosquera-Corral, A.; Campos, J.L.; Méndez, R.; Costa, R.H.R. Effects of Inoculum Type and Aeration Flowrate on the Performance of Aerobic Granular SBRs. Processes 2017, 5, 41.

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