Impact of carrier media on oxygen transfer and wastewater hydrodynamics on a moving attached growth system

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dc.contributor.author Dias, Joana
dc.contributor.author Bellingham, Mell
dc.contributor.author Hassan, Junaid
dc.contributor.author Barrett, Mark
dc.contributor.author Stephenson, Tom
dc.contributor.author Soares, Ana
dc.date.accessioned 2018-06-20T09:41:02Z
dc.date.available 2018-06-20T09:41:02Z
dc.date.issued 2018-06-07
dc.identifier.citation Dias J, Bellingham M, Hassan J, Barrett M, Stephenson T, Soares A, Impact of carrier media on oxygen transfer and wastewater hydrodynamics on a moving attached growth system, Chemical Engineering Journal, Available online 7 June 2018 en_UK
dc.identifier.issn 1385-8947
dc.identifier.uri http://dx.doi.org/10.1016/j.cej.2018.06.028
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/13253
dc.description.abstract This study investigated the impact of five different carrier media on oxygen transfer efficiency and flow mixing in a 2 m3 moving attached growth system pilot-plant. The five media studied varied in shape (cylindrical and spherical), size, voidage and protected surface area (112-610 m2/m3). In clean water tests, the media enhanced the overall oxygen transfer efficiency by 23-45% and hydraulic efficiency (HE) by 41-53%, compared with operation with no media. When using spherical media (Media 1, 2 and 3), the presence of biofilm increased the HE to 89, 93 and 100%, respectively. Conversely, Media 4 and 5 with biofilm contributed to a reduction in HE to 74 and 63%, respectively. The media protected surface area, the parameter traditionally selected to design biofilm processes, did not correlate with HE or with oxygen transfer efficiency in clean water tests. This study provides clear evidence that other media physical properties play a role in the mixing and oxygen transfer in moving attached growth systems. A correlation (R2) of 0.89 and 0.90 was obtained between the media dimensionality times voidage (Di x Voi) and HE, with and without biofilm development, respectively. The combination of parameters (Di x Voi / HE) also correlated well with oxygen transfer efficiency in clean water (R2 of 0.92 without biofilm and R2 of 0.88 with biofilm). Dimensionality and voidage should be utilised to design and optimise media size and shape, to enhance mixing and oxygen transfer, ultimately contributing to energy savings and higher removal efficiencies. en_UK
dc.language.iso en en_UK
dc.publisher Elsevier en_UK
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ *
dc.subject Aeration efficiency en_UK
dc.subject Carrier media en_UK
dc.subject Dimensionality en_UK
dc.subject Hydraulic efficiency en_UK
dc.subject Voidage en_UK
dc.title Impact of carrier media on oxygen transfer and wastewater hydrodynamics on a moving attached growth system en_UK
dc.type Article en_UK


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