A submersible mixer is a mechanical device that is used to mix sludge tanks and other liquid volumes. Submersible mixers are often used in sewage treatment plants

Sewage treatment

Sewage treatment, or domestic wastewater treatment, is the process of removing contaminants from wastewater and household sewage, both runoff and domestic. It includes physical, chemical, and biological processes to remove physical, chemical and biological contaminants...

 to keep solids in suspension in the various process tanks and/or sludge holding tanks.

Working principle

The submersible mixer is operated by an electric motor, which is coupled to the mixer's propeller, either direct-coupled or via a planetary gear-reducer. The propeller rotates and creates liquid flow in the tank, which in turn keeps the solids in suspension. The submersible mixer is typically installed on a guide rail system, which enables the mixer to be retrieved for periodic inspection and preventive maintenance.

Applications

Examples of applications where submersible mixers are commonly applied:

• Anoxic/anaerobic tanks and oxidation basins at sewage treatment plants
• IFAS, MBBR, and other fixed film biocarrier processes
• Mixing of sewage wet wells
• Reception tanks and post-digestion tanks at biogas
  Biogas
  Biogas typically refers to a gas produced by the biological breakdown of organic matter in the absence of oxygen. Organic waste such as dead plant and animal material, animal dung, and kitchen waste can be converted into a gaseous fuel called biogas...
  
  facilities
• Liquid Manure storage tanks at dairy, hog, and poultry farms
• Waste processing at slaughterhouses, poultry abattoirs, fish processing plants, etc.