Development of a novel lightweight media for Biological Aerated Filters (BAFS)

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dc.contributor.authorMoore, R.
dc.contributor.authorQuarmby, Joanne
dc.contributor.authorStephenson, Tom
dc.date.accessioned2017-03-03T11:45:47Z
dc.date.available2017-03-03T11:45:47Z
dc.date.issued1999-03-03
dc.description.abstractClay has been foamed and extruded using novel technology, to produce a lightweight media called StarLight C. Altering the production process parameters allows control of the media diameter, density, strength, and surface roughness. In its application as a Biological Aerated Filter (BAF) media, a low density may be advantageous since this will reduce the minimum fluidisation velocity (Vmf) of the media. Consequently a lower liquid velocity will be required during filter backwashing, which could reduce the operating costs and increase the productivity of the reactor. This paper reports the performance of StarLight C and standard expanded clay (media A) as media in pilot scale BAFs treating settled sewage with hydraulic residence times between 58 and 96 minutes. The BAFs were backwashed every 24 hours at a liquid flow rate corresponding to 40% of the Vmf of the media. The BAF using StarLight C required approximately half the volume of backwash water needed by the BAF filled with media A. To optimise the performance of BAFs further the filter run time should be maximised. This requires the media size and voidage to be maximised without compromising filtration efficiency.en_UK
dc.identifier.citationMoore R, Quarmby J, Stephenson T. (1999) Development of a novellightweight media for Biological Aerated Filters (BAFS). 3rd International Meeting On Biological Aerated Filters (BAF3) - 3 March 1999, Cranfield University, UKen_UK
dc.identifier.isbn1861940157
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/11562
dc.language.isoenen_UK
dc.publisherSchool of Water Sciences, Cranfield Universityen_UK
dc.rights© 1999. The contents are world copyrighted by the School of Water Sciences, Cranfield University, in the first instance. Permission must be sought from the School of Water Sciences before the whole or any part of this document is transcribed.
dc.titleDevelopment of a novel lightweight media for Biological Aerated Filters (BAFS)en_UK
dc.typeConference paperen_UK

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3rd Symposium on Biological Aerated Filters (BAF3) - 1999