Submersible thruster

Submersible jet mixer | High flow rate, low energy consumption, prevents sludge settling

Submersible jet mixers (also known as low-speed jet mixers) are specifically designed for biological treatment tanks, oxidation ditches, and anaerobic/anoxic tanks in wastewater treatment plants. They generate low-speed, large-volume axial water flow to achieve water circulation within the tank, preventing activated sludge sedimentation and promoting full contact between microorganisms and wastewater. The equipment utilizes a high-efficiency hydraulic impeller (fiberglass or stainless steel), a heavy-duty submersible motor, and a simple installation system, offering advantages such as low energy consumption, high thrust, long service life, and maintenance-free operation. It is widely used in municipal wastewater treatment plants, industrial wastewater treatment, oxidation ditches, equalization tanks, and denitrification tanks.

core components

Submersible motor: IP68 protection rating, F/H class insulation, capable of continuous 24-hour operation; built-in overheat and leakage protection sensors.

Impeller: Fiberglass (FRP) or 304/316L stainless steel, hydraulically balanced design, large diameter, low speed, generating efficient axial thrust.

Reduction mechanism: Typically uses helical gear reduction or planetary reduction, ensuring smooth transmission and low noise.

Installation system: Includes guide rod, lifting bracket, lifting rope, and base; allows for lifting and maintenance without draining the pool.

Control cabinet: Optional motor protection controller (overload, phase loss, leakage, over-temperature alarm) and frequency converter soft start.

Working principle

The motor drives the impeller to rotate at a low speed. The curved blades of the impeller push the water backward, forming a continuous, wide axial water flow. This water flow propels the media further away in the pool forward, achieving overall water circulation. The impeller generates low-frequency eddies, rather than high shear forces, thus avoiding the breakup of activated sludge flocs and keeping the sludge suspended to prevent sludge accumulation.

Main advantages

High-efficiency flow propulsion: A large-diameter impeller optimized for hydraulics generates a high-flow, low-shear water flow, achieving a circulation coverage distance of over 30 meters.

Low energy consumption: The low-speed, high-thrust design results in significantly lower energy consumption per unit thrust compared to traditional mixers.

Corrosion-resistant materials: Impellers are available in FRP or stainless steel, while the motor housing is made of cast iron or stainless steel, resistant to wastewater corrosion.

Easy installation and maintenance: The guide rod installation system allows the main unit to be moved to the top of the tank for inspection via a lifting device, eliminating the need for drainage or personnel to enter the tank.

Comprehensive safety protection: The motor is equipped with leakage and over-temperature sensors to prevent burnout.

 Various tank types applicable: Suitable for oxidation ditches, rectangular tanks, circular tanks, irregularly shaped tanks, etc.

Technical parameters

Impeller diameter: 800 – 2500 mm

Speed: 36 – 63 rpm

Motor power: 1.5 – 7.5 kW (customizable)

Material: Impeller FRP or SS304/316L; Motor housing cast iron/SS304

Protection class: IP68

Insulation class: Class F (Class H optional)

Insulation angle: 0° – 90° adjustable

Power supply: Customizable

Application areas

Municipal wastewater treatment plant oxidation ditch plug flow system

Anaerobic and anoxic tanks in A²/O process

Industrial wastewater equalization tanks (to prevent sedimentation)

Denitrification tanks (to maintain suspended sludge layer)

Large-scale aquaculture water circulation system. We can provide selection calculations based on your tank size, media concentration, and thrust requirements. Please provide tank diagrams and process parameters for a solution.