%0 Journal Article
%T Recircula£¿£¿o de ¨¢gua de lavagem de filtros e perigos associados a protozo¨¢rios
%A Freitas
%A Adi¨¦liton Galv£¿o de
%A Bastos
%A Rafael Kopschitz Xavier
%A Bevilacqua
%A Paula Dias
%A P¨¢dua
%A Valter L¨²cio
%A Pimenta
%A Jo£¿o Francisco de Paula
%A Andrade
%A Rosane Cristina de
%J Engenharia Sanitaria e Ambiental
%D 2010
%I Brazilian Association of Sanitary and Environmental Engineering
%R 10.1590/S1413-41522010000100005
%X this paper presents the results of (i) the characterization of the filter backwash water (fbw) of vi£¿osa university water treatment plant; (ii) trials of fbw clarification in sedimentation columns, with and without polymer application; (iii) trials of fbw recycling in a pilot plant, under variable conditions of recycling flow rates (5 to 20% of the raw water flow - rw) and of the influent water (rw + fbw) turbidity (12.1 to 257.3 ut). around 101 giardia spp. cysts and cryptosporidium spp. oocysts per liter were found in the fbw. the results of sedimentation columns and recycling trials demonstrated that fbw clarification using polymers contributes to minimize hazards related to the introduction of giardia cysts and cryptosporidium oocysts.
%K clarification
%K cryptosporidium spp.
%K filter backwash water
%K giardia spp.
%K recycling
%K turbidity.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1413-41522010000100005&lng=en&nrm=iso&tlng=en