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

Lundh, Måns LU ; Jönsson, Lennart LU and Dahlquist, J (2002) 2nd World Water Congress of the International Water-Association In 2nd World Water Congress: Drinking Water Treatment 2(2). p.69-76
Abstract
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... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
flow structure, dissolved air flotation, acoustic Doppler velocimeter, air content, removal efficiency, moving bio-bed reactor
in
2nd World Water Congress: Drinking Water Treatment
volume
2
issue
2
pages
69 - 76
publisher
IWA Publishing
conference name
2nd World Water Congress of the International Water-Association
external identifiers
  • wos:000176510900009
  • scopus:0036090991
ISSN
1606-9749
ISBN
1-84339-417-0
language
English
LU publication?
yes
id
40426828-fb9d-4004-97f7-b02a734e911b (old id 1407238)
date added to LUP
2009-06-02 16:42:02
date last changed
2017-01-01 07:00:58
@inproceedings{40426828-fb9d-4004-97f7-b02a734e911b,
  abstract     = {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.},
  author       = {Lundh, Måns and Jönsson, Lennart and Dahlquist, J},
  booktitle    = {2nd World Water Congress: Drinking Water Treatment},
  isbn         = {1-84339-417-0},
  issn         = {1606-9749},
  keyword      = {flow structure,dissolved air flotation,acoustic Doppler velocimeter,air content,removal efficiency,moving bio-bed reactor},
  language     = {eng},
  number       = {2},
  pages        = {69--76},
  publisher    = {IWA Publishing},
  title        = {Flow structures in a dissolved air flotation pilot tank and the influence on the separation of MBBR floc},
  volume       = {2},
  year         = {2002},
}