Desenvolvimento de uma metodologia de determinação da velocidade de raspadores de espuma em células de flotação por ar.

Abstract

Oily water is a generic term used to describe all waters with varying amounts of oils and greases, as well as a variety of other materials in suspension. The process of generating energy in a thermoelectric plant (UTE) produces several sources of contamination, among them is the production of oily water. In this way, collecting, storing and giving an adequate destination is part of the operational activities in a UTE. There are several treatment methods for oily waters, such as gravitational vessels, granular filtration systems, flotation by induced or dissolved air, centrifugation, use of hydrocyclones, among others. Among these methods some treatments have been highlighted as the process of dissolved air flotation (FAD). After careful review of the literature, this work carried out experiments to identify correlations between FAD kinetics and the velocity of foam removal in a flotation chamber, i.e. flotation velocity. For this, statistical methods of non-linear numerical regression were used, comparing mathematical models of FAD. A correlation was then identified for the rate of foam removal from a flotation chamber, the mean value of which was between 13,09 m/h. Thus, it was shown that information on mass transfer mechanisms can contribute to cost reduction in FAD camera projects.