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Ammoniacal nitrogen removal in biological aerated filters: The effect of media size

Kent, TD; Williams, SC; Fitzpatrick, CSB; (2000) Ammoniacal nitrogen removal in biological aerated filters: The effect of media size. Journal of the Chartered Institution of Water and Environmental Management , 14 (6) pp. 409-414. 10.1111/j.1747-6593.2000.tb00286.x.

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Abstract

Recent legislation has led to stringent ammoniacal-nitrogen consents and the need for first-time sewage treatment in coastal areas where land is limited. This has led to the need to improve 'small footprint' sewage-treatment processes (such as biological aerated filters) which can be used for carbonaceous treatment, nitrification, or for combined treatment. The removal of ammoniacal nitrogen in filters containing different sizes of Lytag medium and operated for combined carbonaceous treatment and nitrification, was compared at different hydraulic and volumetric loading rates. The results suggest that filters containing the smallest media size (2-4 mm), gave optimum nitrification at ammoniacal-nitrogen loading rates up to 0.6 kg/m3. d. At higher loading rates there was a rapid decrease in nitrification for this size of medium but, with 2.8-5.6 mm medium, nitrification continued at loading rates up to 1 kg amm. N/m3 d. The filters containing larger media sizes (4-8 mm and 5.6-11.2 mm) exhibited low levels of nitrification above a loading rate of 0.2-0.4 kg amm. N/m3. d.

Type: Article
Title: Ammoniacal nitrogen removal in biological aerated filters: The effect of media size
DOI: 10.1111/j.1747-6593.2000.tb00286.x
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: http://discovery.ucl.ac.uk/id/eprint/187037
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