Three decades of oxygen transfer tests in clean water in a pilot scale test tank with fine-bubble diffusers and the resulting conclusions for WWTP operation
| Autor: | Maximilian Schwarz, Martin Wagner, Justus Behnisch |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Oxygen transfer
020401 chemical engineering Pilot scale Clean water Environmental engineering Fine bubble diffusers Environmental science 02 engineering and technology 010501 environmental sciences 0204 chemical engineering 01 natural sciences 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Water Practice and Technology. 15:910-920 |
| ISSN: | 1751-231X |
| DOI: | 10.2166/wpt.2020.072 |
| Popis: | We summarized the experience from three decades of oxygen transfer testing and aeration research at the Technical University of Darmstadt to validate the oxygen transfer efficiency of modern fine-bubble diffusers. A total of 306 oxygen transfer tests in clean water of 65 different fine-bubble diffusers, carried out in the same test tank under identical test conditions, were analysed and compared with previous results. As a result, we could show that the performance of fine-bubble aeration systems has increased by 17% over the last three decades. Therefore, modern well-designed and operated aeration systems can achieve specific standard oxygen transfer efficiency (SSOTE) values between 8.5 and 9.8% · m−1. Additionally, a comparison of various diffuser types and diffuser densities was done. Based on the new results, an exemplary cost/benefit analysis for a 100,000 PE WWTP shows the calculation of an optimized diffuser density with respect to investment and operating costs. |
| Databáze: | OpenAIRE |
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