Biological Excess-Sludge Reduction and Sludge Settleability Improvement Using a New Modified IFAS-OSA Process by Adding an Anoxic Sludge-Holding Tank to the Return Activated Sludge Line of the System
Publication: Journal of Environmental Engineering
Volume 147, Issue 2
Abstract
Integrated fixed film activated sludge-oxic settling anoxic system (IFAS-OSA) is a new, modified system for excess-sludge reduction. In this research, the efficiency of the IFAS-OSA system in biological excess-sludge reduction with the addition of an anoxic sludge-holding tank to the return line of the system was studied. The results showed that the average oxidation reduction potentials (ORPs) in the , , , and processes were , , and , respectively. The average values of in the IFAS, , and processes were , , and g MLSS/g COD, respectively. Accordingly, in the and processes, the sludge production was reduced by 27.9% and 46.5%, and the excess sludge was reduced by 13.65% and 22%, respectively, compared with the control system. Furthermore, as the average reached , and , the TSS values in the effluents of the IFAS, , and processes reached , , and , respectively. The average percentages of total nitrogen (TN) removal efficiency in the IFAS, , and processes were , , and , respectively, whereas the percentages of phosphorus removal efficiency in these processes were , , and , respectively. This study revealed that the modified IFAS-OSA system had a more efficient performance than the IFAS system.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors are thankful to the Environmental Engineering Department of the Islamic Azad University of Tehran (Science and Research Branch) for their support.
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Received: Jun 13, 2020
Accepted: Sep 16, 2020
Published online: Dec 4, 2020
Published in print: Feb 1, 2021
Discussion open until: May 4, 2021
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