Experimental Oxygen Mass Transfer Study of Micro-Perforated Diffusers

We studied new micro-perforated diffuser concepts for the aeration process in wastewater treatment plants and evaluated their aeration efficiency. These are micro-perforated plate diffusers with orifice diameters of 30 µm, 50 µm and 70 µm and a micro-perforated tube diffuser with an orifice diameter...

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Autores principales:	Robert Herrmann-Heber, Florian Ristau, Ehsan Mohseni, Sebastian Felix Reinecke, Uwe Hampel
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	micro-perforated diffuser oxygen transfer efficiency oxygen mass transfer aeration efficiency Technology T
Acceso en línea:	https://doaj.org/article/242cb9b517a14708b90c56dcee99728c
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spelling	oai:doaj.org-article:242cb9b517a14708b90c56dcee99728c2021-11-11T16:01:15ZExperimental Oxygen Mass Transfer Study of Micro-Perforated Diffusers10.3390/en142172681996-1073https://doaj.org/article/242cb9b517a14708b90c56dcee99728c2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/21/7268https://doaj.org/toc/1996-1073We studied new micro-perforated diffuser concepts for the aeration process in wastewater treatment plants and evaluated their aeration efficiency. These are micro-perforated plate diffusers with orifice diameters of 30 µm, 50 µm and 70 µm and a micro-perforated tube diffuser with an orifice diameter of 50 µm. The oxygen transfer of the diffuser concepts is tested in clean water, and it is compared with commercial aerators from the literature. The micro-perforated tube diffuser and micro-perforated plate diffusers outperform the commercial membrane diffusers by up to 44% and 20%, respectively, with regard to the oxygen transfer efficiency. The most relevant reason for the improved oxygen transfer is the fine bubble aeration with bubble sizes as small as 1.8 mm. Furthermore, the more homogenous cross-sectional bubble distribution of the micro-perforated tube diffuser has a beneficial effect on the gas mass transfer due to less bubble coalescence. However, the pressure drop of micro-perforated diffusers seems to be the limiting factor for their standard aeration efficiencies due to the size and the number of orifices. Nevertheless, this study shows the potential for better aeration efficiency through the studied conceptual micro-perforated diffusers.Robert Herrmann-HeberFlorian RistauEhsan MohseniSebastian Felix ReineckeUwe HampelMDPI AGarticlemicro-perforated diffuseroxygen transfer efficiencyoxygen mass transferaeration efficiencyTechnologyTENEnergies, Vol 14, Iss 7268, p 7268 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	micro-perforated diffuser oxygen transfer efficiency oxygen mass transfer aeration efficiency Technology T
spellingShingle	micro-perforated diffuser oxygen transfer efficiency oxygen mass transfer aeration efficiency Technology T Robert Herrmann-Heber Florian Ristau Ehsan Mohseni Sebastian Felix Reinecke Uwe Hampel Experimental Oxygen Mass Transfer Study of Micro-Perforated Diffusers
description	We studied new micro-perforated diffuser concepts for the aeration process in wastewater treatment plants and evaluated their aeration efficiency. These are micro-perforated plate diffusers with orifice diameters of 30 µm, 50 µm and 70 µm and a micro-perforated tube diffuser with an orifice diameter of 50 µm. The oxygen transfer of the diffuser concepts is tested in clean water, and it is compared with commercial aerators from the literature. The micro-perforated tube diffuser and micro-perforated plate diffusers outperform the commercial membrane diffusers by up to 44% and 20%, respectively, with regard to the oxygen transfer efficiency. The most relevant reason for the improved oxygen transfer is the fine bubble aeration with bubble sizes as small as 1.8 mm. Furthermore, the more homogenous cross-sectional bubble distribution of the micro-perforated tube diffuser has a beneficial effect on the gas mass transfer due to less bubble coalescence. However, the pressure drop of micro-perforated diffusers seems to be the limiting factor for their standard aeration efficiencies due to the size and the number of orifices. Nevertheless, this study shows the potential for better aeration efficiency through the studied conceptual micro-perforated diffusers.
format	article
author	Robert Herrmann-Heber Florian Ristau Ehsan Mohseni Sebastian Felix Reinecke Uwe Hampel
author_facet	Robert Herrmann-Heber Florian Ristau Ehsan Mohseni Sebastian Felix Reinecke Uwe Hampel
author_sort	Robert Herrmann-Heber
title	Experimental Oxygen Mass Transfer Study of Micro-Perforated Diffusers
title_short	Experimental Oxygen Mass Transfer Study of Micro-Perforated Diffusers
title_full	Experimental Oxygen Mass Transfer Study of Micro-Perforated Diffusers
title_fullStr	Experimental Oxygen Mass Transfer Study of Micro-Perforated Diffusers
title_full_unstemmed	Experimental Oxygen Mass Transfer Study of Micro-Perforated Diffusers
title_sort	experimental oxygen mass transfer study of micro-perforated diffusers
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/242cb9b517a14708b90c56dcee99728c
work_keys_str_mv	AT robertherrmannheber experimentaloxygenmasstransferstudyofmicroperforateddiffusers AT florianristau experimentaloxygenmasstransferstudyofmicroperforateddiffusers AT ehsanmohseni experimentaloxygenmasstransferstudyofmicroperforateddiffusers AT sebastianfelixreinecke experimentaloxygenmasstransferstudyofmicroperforateddiffusers AT uwehampel experimentaloxygenmasstransferstudyofmicroperforateddiffusers
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Experimental Oxygen Mass Transfer Study of Micro-Perforated Diffusers

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