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Impact of Media Aging on the Removal of Cryptosporidium in Granular Media Filters

par Papineau, I.;Tufendji, N.;Servais, Pierre ;Barbeau, B.
Référence Journal of environmental engineering, 139, 5, page (603-611)
Publication Publié, 2013

Article révisé par les pairs

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Résumé :

A study was conducted to assess the impact of media aging on Cryptosporidium parvum transport and retention in granular filters. Column experiments were conducted with sand, anthracite and granular activated carbon (GAC) filters. All columns possessed an identical filter design and grain size distribution. Oocyst removal was evaluated with both new and aged media. The variation of performance amongst new media was attributed to the shape of the tested granular media and to the concentration of extractable metals on the surface of collector grains. Media aging significantly increased the treatment performance of sand (26%) and of GAC (31%) but had no influence on the performance of anthracite. This enhanced performance of aged media correlated well with the extent of biofilm development. The best removal performance was observed with aged GAC (71 ± 2%) which supported the highest amount of biomass according to polysaccharide and protein measurements. The results of this investigation are of particular interest as they suggest that media aging increases the removal of protozoan parasites in full-scale granular filters.