Biofilms as an aid to nitrogen removal in sewage treatment lagoons

Baskaran, Kanagaratnam, Scott, PH and Connor, MA 1992, Biofilms as an aid to nitrogen removal in sewage treatment lagoons, Water Science and Technology, vol. 26, no. 7-8, pp. 1707-1716, doi: 10.2166/wst.1992.0614.

Title Biofilms as an aid to nitrogen removal in sewage treatment lagoons
Author(s) Baskaran, KanagaratnamORCID iD for Baskaran, Kanagaratnam
Scott, PH
Connor, MA
Journal name Water Science and Technology
Volume number 26
Issue number 7-8
Start page 1707
End page 1716
Total pages 10
Publisher IWA Publishing
Publication date 1992-01-01
ISSN 0273-1223
Summary A pilot study of sewage treatment lagoons near Melbourne indicated that the best way to enhance nitrogen removal in such lagoons was to promote nitrification. Combined algal/bacterial biofilms grown on surfaces immersed in the lagoons showed potential for greatly increasing the extent of nitrification. A laboratory study was undertaken to determine the effect of pH, dissolved oxygen concentration, temperature and other factors on the nitrifying capabilities of such biofilms; effective nitrification was observed at temperatures down to 10°C, at pH's down to 5.5 and at dissolved oxygen levels down to 2.5 mg/L. Tanks containing biofilm-coated plates nitrified much more effectively than tanks containing only suspended microbial growths. At dissolved oxygen levels of 2-3 mg/L, up to 30% of the ammonia-nitrogen fed to tanks containing biofilm-coated plates was removed by denitrification. Photosynthetic activity in the biofilm greatly enhanced nitrification efficiencies at low dissolved oxygen levels.
Language eng
DOI 10.2166/wst.1992.0614
Indigenous content off
HERDC Research category C1.1 Refereed article in a scholarly journal
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