Method of designing a double-chamber flotation machine
with an aeration ejection system with dispersant

Summary

A double-chamber flotation machine with an ejection system with a dispersant is considered. It is demonstrated that the use of a dispersant provides for the multimodal distribution of bubble sizes characterized by several groups. The importance of the correct choice of the process time as one of the most important parameters for the flotation unit design is noted. The method of calculating a double-chamber flotation machine with an ejection system with a dispersant with due account for the specific features of the bubble size distribution and hydrodynamic situation in chambers is proposed. The method of calculating the process time is based on the use of multistage flotation model that presents the distribution of bubbles into several groups depending on the size. The hydrodynamic situation in the chambers is taken into account by the use of equations for perfect-mixing and plug-flow reactors. The calculation of a double-chamber flotation machine with an ejection system with a dispersant for the purification of carwash wastewater was carried out. The results of calculating the parameters of the aeration system, process constants, flotation time and specific geometrical parameters of the flotation machine are presented. The presented case study demonstrates the possible use of the given method for designing the proposed flotation unit.

Key words

wastewater , flotation , ejection aeration system , dispersant , flotation model , flotation time