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Characterisation of the behaviour of particles in biofilters for pre-treatment of drinking water

Frank Persson ; J. Långmark ; Gerald Heinicke (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik) ; Torsten Hedberg (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik) ; J. Tobiason ; T. A. Stenström ; Malte Hermansson
Water Research (0043-1354). Vol. 39 (2005), 16, p. 3791-3800.
[Artikel, refereegranskad vetenskaplig]

Biofiltration of surface water was examined using granular activated carbon (GAC) and expanded clay (EC). Particle removal was 60-90%, measured by flow cytometry, which enabled discrimination between total- and autofluorescent particles (microalgae) in size ranges of 0.4-1 and 1-15 mu m, and measured by on-line particle counting. Total particles were removed at a higher degree than autofluorescent particles. The biofilters were also challenged with 1 mu m fluorescent microspheres with hydrophobic and hydrophilic surface characteristics and bacteriophages (Salmonella typhimurium 2813). Added microspheres were removed at 97-99% (hydrophobic) and 85-89% (hydrophilic) after 5 hydraulic residence times (HRT) and microspheres retained in the biofilter media were slowly detaching into the filtrate for a long time after the addition. Removal of bacteriophages (5 HRT) was considerably lower at 40-59%, and no long-lasting detachment was observed. A comparison of experimental data with theoretical predictions for removal of particles in clean granular media filters revealed a similar or higher removal of particles around 1 mu m in size than predicted, while bacteriophages were removed at a similar or lesser extent than predicted. The results highlight the selectivity and dynamic behaviour of the particle removal processes and have implications for operation and microbial risk assessment of a treatment train with biofilters as pre-treatment. (c) 2005 Elsevier Ltd. All rights reserved.

Nyckelord: biofiltration, pre-treatment, drinking water, particles, microspheres, autofluoreseent microalgae, bacteriophages, cryptosporidium oocysts, filtration, removal, bacteria, efficiency, retention, surrogate, adhesion, cysts, media

Denna post skapades 2007-04-20. Senast ändrad 2014-10-27.
CPL Pubid: 40717


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Institutioner (Chalmers)

Institutionen för cell- och molekylärbiologi (1994-2011)
Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik


Cell- och molekylärbiologi

Chalmers infrastruktur