An ejector for mixing a reagent with discharge water

The paper presents a research on ejectors used to mix discharge waters with flocculant or coagulant solutions intensifying the flotational discharge water treatment. Results of modelling using ANSYS environment are provided, visualizing the processes going on in the mixing chamber of the ejector as well as estimating parameters of those processes. The velocity gradient values were estimated, which is the main parameter with regard to the mixing process, and therefore characterizing the intensity of discharge water treatment. The dependency between the value of the velocity gradient and the velocity of the water entering the ejector was analyzed. It was shown that the gradient value changes nearly proportionally to the input velocity, and this dependency holds in all directions. The ration between the X component of the gradient and its Y and Z components amounts to approximately 2:1. That means, turbulation does not significantly differ direction-wise, and the mixing conditions are favorable.