Diâmetro efetivo e coeficiente de uniformidade de areia utilizada em filtros empregados no sistema de irrigação

Abstract

The use of water containing suspended sediments and salts are causing serious problems in drip irrigation systems, reducing the life of your components, clogging pipes and emitters. Given this, the use of sand filters in such irrigation systems, gives a better quality of water being used, reducing the risk of clogging of emitters, which promote ahigh efficiency coming from this type of system. The suspended solids in irrigation water may have different origins and of different nature. It is vital to the efficiency of these filters the quality of sand used as filter body, it soon becomes necessary to understand the effective diameter and coefficient of uniformity of it. In this study we investigated four samples of sand, with the aim of determining the effective diameter of the same and the coefficient of uniformity. The effective diameters obtained from the samples: 0.960 mm, 0.970 mm, 0.420 mm and 0.880 mm for samples: 1, 2, 3 and 4 respectively. The highlights are the sand samples 1, 2 and 4 for use in sand filters because they have uniformity coefficients within the established fine. The sample 4 is the most recommended, as well as presenting a uniformity coefficient appropriate, has a smaller value of effective diameter for samples 1 and 2, which allows better water quality.