Mixing Devices

Mixing is an important production process in many phases of water treatment.

Scope of application of mixers

The main applications of mechanical mixing devices (mixers) in the processes of treatment of natural and waste water:

• mixing of chemicals with wastewater;
• homogenization of soluble liquids;
• addition of chemicals to sludge and sediments to improve their dehydrating performance;
• introduction of disinfectants (chlorine, hypochlorite and ozone);
• mixing of liquid suspensions.

Depending on the purpose and the required mixing time, various mixing devices can be used.

Types of mixers

<align="justify">For various types of water treatment, the following main types of mixing devices are used:

• Dynamic impeller mixers. Used for flocculation or coagulation of colloidal particles, for mixing chemicals and maintaining suspension in a suspended state. Horizontal submersible mixers with an impeller stirrer are also often used to maintain flow rates in the circulation oxidation channels, or to mix the content of anoxic reactors;
• Dynamic frame mixers are designed for slow mixing. Used in flocculants in order to maintain the system in a suspended state and, at the same time, not to destroy the generated flakes;
• Static mixers. Used for chemicals requiring instant mixing, such as aluminum sulfate, ferric chloride, cationic polymers. Also used for rapid mixing of disinfectants, such as chlorine or ozone. Static mixers contain internal blades or partitions that cause sudden changes in velocity structures, as well as reversal of the pulse. Static mixers are characterized by the absence of moving parts.

With the increase in the size of the impeller, more power is consumed to move the flow and less for turbulence or shear. Mixers with small impellers operating at high speeds are better for dissipating gases or a small amount of chemical products in wastewater. Mixers with large and slow impellers are better for mixing two fluid streams, or for flocculation.

Mixers are selected based on the data provided by the manufacturers. There is no satisfactory method for scaling from one mixer to another. Therefore, it is extremely important to have appropriate work experience and engineering knowledge in the design and commissioning of the apparatuses with mixing devices.

Certified experts of MY PROJECT have plenty of experience in design, installation, commissioning and maintenance of mixing equipment, including mixers for treatment plants, produced by leading domestic and world manufacturers. This ensures the right choice and optimal operation of any type of equipment.