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Flow structures in a dissolved air flotation pilot tank and the influence on the separation of MBBR floc

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Author

Summary, in English

The objective of the study was to find ways of improvement of the dissolved air flotation process by studying the flow structure. The paper presents experimental data on flow structures and the relation between the flow structure and the removal efficiency. Measurements have been performed in a pilot plant with an Acoustical Doppler Velocimeter. The water velocity was measured in a grid net, giving insight into the flow structure. The removal efficiency was analysed at Malmo wastewater treatment plant in Sweden. The pilot plant separated biological floc from a Kaldnes Moving Bio-Bed Reactor (MBBR). The efficiency of the separation was analysed by measurements of suspended solids in the influent and the effluent. Air content was measured inside the tank and in the re-cycle. The result showed that basically two flow structures existed; the stratified and the short-circuit flow structure. The stratified flow structure seemed correlated to efficient separation of particles while the short-circuit flow structure seemed to have a negative effect, especially when the flow structure was affected by varying the re-cycle rate, i.e. the air content. Conclusively, the flow structure seemed to be correlated to type of flow structure. However, studies with higher concentration of suspended solids for verification were suggested.

Publishing year

2002

Language

English

Pages

69-76

Publication/Series

2nd World Water Congress: Drinking Water Treatment

Volume

2

Issue

2

Document type

Conference paper

Publisher

IWA Publishing

Topic

  • Water Engineering

Keywords

  • flow structure
  • dissolved air flotation
  • acoustic Doppler velocimeter
  • air content
  • removal efficiency
  • moving bio-bed reactor

Conference name

2nd World Water Congress of the International Water-Association

Conference date

2001-10-15 - 2001-10-19

Conference place

Berlin, Germany

Status

Published

ISBN/ISSN/Other

  • ISSN: 1606-9749
  • ISBN: 1-84339-417-0