Evaluation of methodology of filtration to protect fountains in places with risk of microbiologic contamination of water

Abstract

This research was developed during april-2006 to january-2007, in the Universidade Estadual do Centro Oeste, CEDETEG Campus, in Guarapuava City, Parana State, Brazil. The main objective was to evaluate the efficiency of different filter compositions, to retain contaminate agents in water. Three models of filter were tested in order to check their efficiency to remove pathogenic organisms present in water contaminated by E. nana and G. lamblia cysts, A. lumbricoides eggs and A. duodenale larvae. It is possible to say that, among the different filter compositions studied, the one that presented less indication of passage of contaminate agents during the process of filtration was the one that used layers, with the following components a) crushed stone, b) clayey soil, c) sand river d) industrial sand, and e) sand + pure clay in a combination of 50% (in substitution of use of TNT), represents an efficient alternative to retreat parasites of E. nana cysts, cysts of G. lamblia, eggs of A. lumbricoides and A. duodenale when they are present as contaminate agents of water. The contaminate agents E. nana cysts and eggs of A. lumbricoides, were the most difficult agents to filtrate.