Tero Luukkonen, Anne Heponiemi; Combination of peracetic acid dosing with diffused aeration in municipal wastewater treatment. Water Sci Technol 15 August 2023; 88 (4): 1087–1096. doi: https://doi.org/10.2166/wst.2023.262
Combination of peracetic acid dosing with diffused aeration in municipal wastewater treatment
|Author:||Luukkonen, Tero1; Heponiemi, Anne2|
1Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 8000, FI-90014, Oulu, Finland
2Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 8000, FI-90014, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 0.6 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe20231009139296
|Publish Date:|| 2023-10-09
Wastewater aeration is an important unit operation that provides dissolved oxygen for microorganisms in wastewater treatment. In this study, the impact of peracetic acid (PAA) dosing on wastewater aeration was assessed in terms of oxygen transfer, visual observation of bubble size changes, and evolution of dissolved oxygen from PAA (and H₂O₂) decomposition. Oxygen transfer coefficients improved with PAA concentrations of up to 7 mg/L, which was probably due to the smaller bubbles being formed from the aeration diffuser and evolution of small bubbles from PAA (and H₂O₂) decomposition. At a PAA concentration higher than 7 mg/L, the accumulation of acetate molecules to the gas–liquid interface of bubbles likely began to counteract the positive impact of bubble size decrease by increasing the mass transfer resistance of oxygen from bubbles to water. Finally, a continuous bench-scale primary effluent aeration experiment demonstrated that at a continuous PAA dosing of 1 mg/L, the air input by a compressor could be decreased by 54%, while keeping the oxygen level constant at approximately 1.5 mg/L. PAA dosing could be combined, for example, with aerated grit removal to enhance the primary effluent aeration together with additional benefits of partial disinfection and odor formation prevention.
Water Science & Technology
|Pages:||1087 - 1096|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
116 Chemical sciences
215 Chemical engineering
218 Environmental engineering
This work was financially supported by the University of Oulu and the Academy of Finland Profi5 (grant ID 326291).
© 2023 The Authors. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0), which permits copying, adaptation and redistribution, provided the original work is properly cited (http://creativecommons.org/licenses/by/4.0/).