Development of a continuous flow reactor for aerobic granular sludge
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Date
2019
Authors
Devlin, Tanner
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Abstract
Aerobic granular sludge is an advanced biological process that provides sustainable wastewater treatment. Compared to conventional wastewater treatment processes, aerobic granular sludge exhibits better settling, higher volumetric loading, reduced chemical and electrical requirements, and less biosolids production. Currently, aerobic granular sludge is only available as a sequencing batch reactor process. Sequencing batch reactors, however, would not be suitable for retrofit at most existing wastewater treatment facilities. Therefore, many facilities would not be able to realize the benefits of aerobic granular sludge unless significant changes to existing infrastructure were made. A more compatible technology, being a continuous flow reactor, would facilitate the implementation of aerobic granular sludge into existing facilities that would otherwise struggle with sequencing batch reactors.
Thus, the goal of these studies was to develop a continuous flow reactor for aerobic granular sludge that would be suitable for retrofit into existing wastewater treatment facilities. To attain the goal, several items had to be addressed, including: 1) the suitability of aerobic granular sludge to treat low-strength, municipal wastewater; 2) the importance of hydrodynamic shear force for aerobic granular sludge stability; 3) the role of organic loading rate on aerobic granular sludge stability and performance; 4) the impact of selective wasting on granulation in continuous flow; and 5) the impact of reactor configuration on granulation in continuous flow. For more general items, such as suitability for low-strength wastewater and the role of hydrodynamic shear force, lab-scale sequencing batch reactors were used. The remaining tests were carried out in lab- and pilot-scale continuous flow reactors. Based on the results, design and operational parameters for an aerobic granular sludge-continuous flow reactor were developed and confirmed to be feasible for the treatment of low-strength, municipal wastewater.
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Keywords
Aerobic granular sludge, Continuous flow, Wastewater treatment
Citation
Devlin, T. R., & Oleszkiewicz, J. A. (2018). Cultivation of aerobic granular sludge in continuous flow under various selective pressure. Bioresource Technology, 253, 281–287. https://doi.org/10.1016/j.biortech.2018.01.056
Devlin, T. R., di Biase, A., Kowalski, M., & Oleszkiewicz, J. A. (2017). Granulation of activated sludge under low hydrodynamic shear and different wastewater characteristics. Bioresource Technology, 224, 229–235. https://doi.org/10.1016/j.biortech.2016.11.005
Devlin, T., Kowalski, M., Di Biase, A., & Oleszkiewicz, J. (2018). Kinetics of aerobic granular sludge treating low-strength synthetic wastewater at high dissolved oxygen. Environmental Technology, 1–9. https://doi.org/10.1080/09593330.2018.1538258
Corsino, S., Di Biase, A., Devlin, T., Munz, G., Torregrossa, M., & Oleszkiewicz, J. (2017). Effect of extended famine conditions on aerobic granular sludge stability in the treatment of brewery wastewater. Bioresource Technology, 226, 150–157. https://doi.org/10.1016/j.biortech.2016.12.026
Devlin, T. R., di Biase, A., Kowalski, M., & Oleszkiewicz, J. A. (2017). Granulation of activated sludge under low hydrodynamic shear and different wastewater characteristics. Bioresource Technology, 224, 229–235. https://doi.org/10.1016/j.biortech.2016.11.005
Devlin, T., Kowalski, M., Di Biase, A., & Oleszkiewicz, J. (2018). Kinetics of aerobic granular sludge treating low-strength synthetic wastewater at high dissolved oxygen. Environmental Technology, 1–9. https://doi.org/10.1080/09593330.2018.1538258
Corsino, S., Di Biase, A., Devlin, T., Munz, G., Torregrossa, M., & Oleszkiewicz, J. (2017). Effect of extended famine conditions on aerobic granular sludge stability in the treatment of brewery wastewater. Bioresource Technology, 226, 150–157. https://doi.org/10.1016/j.biortech.2016.12.026