Reverse flexing as a physical/mechanical treatment to mitigate fouling of fine bubble diffusers
| Autor: | John T. Novak, Victory Odize, Diego Rosso, Sudhir Murthy, Joshua D. Smeraldi, Haydée De Clippeleir, Ahmed Al-Omari |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Environmental Engineering
Materials science Bubble Polyurethanes 02 engineering and technology Wastewater 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Diffusion Bioreactors Pressure Diffuser (sewage) 0105 earth and related environmental sciences Water Science and Technology Sewage Fouling Environmental engineering Fine bubble diffusers 021001 nanoscience & nanotechnology Oxygen Waste treatment Activated sludge Water treatment Aeration 0210 nano-technology |
| Zdroj: | Water Science and Technology. 76:1595-1602 |
| ISSN: | 1996-9732 0273-1223 |
| DOI: | 10.2166/wst.2017.171 |
| Popis: | Achieving energy neutrality has shifted focus towards aeration system optimization, due to the high energy consumption of aeration processes in modern advanced wastewater treatment plants. A study on fine bubble diffuser fouling and mitigation, quantified by dynamic wet pressure (DWP), oxygen transfer efficiency and alpha was carried out in Blue Plains, Washington, DC. Four polyurethane fine bubble diffusers were installed in a pilot reactor column fed with high rate activated sludge from a full scale system. A mechanical cleaning method, reverse flexing (RF), was used to treat two diffusers (RF1, RF2), while two diffusers were kept as a control (i.e., no reverse flexing). There was a 45% increase in DWP of the control diffuser after 17 months of operation, an indication of fouling. RF treated diffusers (RF1 and RF2) did not show significant increase in DWP, and in comparison to the control diffuser prevented about 35% increase in DWP. Hence, reverse flexing potentially saves blower energy, by reducing the pressure burden on the air blower which increases blower energy requirement. However, no significant impact of the RF treatment in preventing a decrease in alpha-fouling (αF) of the fine pore diffusers, over time in operation was observed. |
| Databáze: | OpenAIRE |
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