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Title: | Impact of various filling fractions and diffuser densities in the MBBR process on the oxygen transfer rate of finebubble aeration systems − Oxygen Transfer Tests in a glass test tank | Authors: | Vo Truong Thinh | Keywords: | The MBBR process;Oxygen transfer rate;Fine bubble aeration systems | Issue Date: | 2023 | Abstract: | Increasing demands on the treatment performance of municipal wastewater treatment plants have led to a continuous increase in space requirements and annual costs associated with the conventional activated sludge (CAS) process. Biofilm process, particularly Moving Bed Biofilm Reactor Process (MBBR), has emerged as a solution to address such challenges. In the MBBR process, very small, strongly structured plastic media are introduced to provide sites for biofilm growth. However, the main disadvantage of the MBBR process relates to the poor aeration energy efficiency while the oxygen requirement of at least double or even quintuple compared to the CAS process. Subsequently, it is an urgent need for research to optimize the oxygen transfer efficiency (OTE) in the MBBR process. The aim of this study is to investigate the impacts of various filling fractions and diffuser densities on the oxygen transfer rate of fine-bubble aeration systems. To achieve this objective, several experiments using two types of disc diffusers have been conducted in lab- and pilot-scale. The results revealed that the addition of carriers increased gas holdup yet decreased oxygen transfer efficiency in both scales. This could be attributed to two main factors: the vertical rotation of the carriers and the characteristics of the carrier media. The findings highlighted the OTE was affected not only by the filling fraction of the carriers and the diffuser density, but also governed by other aspects such as the properties of the aeration system, the properties of the carrier media, the reactor geometry, and the hydraulic pattern within the reactor |
URI(1): | https://epub.vgu.edu.vn/handle/dlibvgu/1812 | Rights: | Attribution-NonCommercial 4.0 International |
Appears in Collections: | Water Technology, Reuse and Management (WTE) |
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