Abstract
In Hungary subsurface water courses are used generally (95%), which may contain numerous pollutants (from natural or anthropogenic source). Most of these pollutants can be removed by oxidation followed by phase separation. By applying oxidizers hydrodynamic conditions have a significant role in the process; the chemical added shall be perfectly mixed with the raw water in order to react with the soluble pollutants. For the removal of iron and manganese in subsurface water generally potassium permanganate is applied. In this paper the installation of mixers was optimized and propeller and paddle mixers at various rotational speed. As a result of the research it can be stated that paddle mixer has higher mixing efficiency compared to propeller mixer, since the contact surface area between the mixer and water is also higher.
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