Product Description

QJB-W SUBMERSIBLE SLUDGE RETURN PUMP

High Flow · Low Head · Reliable Sludge Recirculation

The QJB-W Series is specially designed for wastewater-treatment processes that require a large recirculation flow at a relatively low head.

It transports mixed liquor or sludge between treatment stages and helps support stable biological treatment, denitrification and nitrogen removal.

Product Applications

The QJB-W Series is suitable for:

Return activated sludge systems

Mixed-liquor internal recirculation

Denitrification and nitrogen-removal processes

Secondary wastewater treatment plants

Sludge suction and circulation pipelines

Biological treatment tanks

Purified-water transfer

Ground drainage

Agricultural irrigation

Waterway-control systems

Other high-flow, low-head pumping duties

Main Advantages

High-Flow, Low-Head Hydraulic Design

The pump is specially designed for applications requiring a large transfer capacity at a small lifting head, making it suitable for sludge-return and internal-recirculation systems.

Anti-Clogging and Anti-Entanglement

The wide, thin and swept-back three-blade impeller provides an unobstructed flow passage and helps reduce clogging and fiber entanglement.

Self-Cleaning Impeller

The smooth blade surface and swept-back hydraulic profile allow the impeller to clean itself during operation.

Reliable Submersible Motor

The pump uses a 50 Hz, three-phase squirrel-cage submersible asynchronous motor with:

IP68 protection

Class F insulation

Cooling by the surrounding medium

Built-in leakage protection

Motor-overload protection

Durable Sealing System

The static sealing system uses O-rings, while the shaft is protected by a mechanical seal that separates the oil chamber from the surrounding liquid.

The catalog states that the selected sealing materials support more than 10,000 hours of safe continuous operation under suitable conditions.

Long-Life Bearings

Imported bearings are used, with a stated design service life of more than 100,000 hours under suitable operating conditions.

Stainless-Steel Motor Shaft

The motor shaft is made of stainless steel, and the rotor is dynamically balanced to improve operational stability.

Compact Stamped Structure

The main unit adopts a compact stamped construction that provides:

Small overall dimensions

High manufacturing precision

Corrosion resistance

Low operating noise

Convenient installation and maintenance

Working Principle

The submersible motor directly drives the three-blade impeller.

As the impeller rotates, the specially shaped inlet cone guides the incoming medium into an optimized hydraulic flow pattern. The impeller then generates a large-volume axial flow and transfers the mixed liquor or sludge through the outlet connection.

The large flow passage, swept-back blades and smooth impeller surface help maintain continuous operation while reducing clogging and entanglement.

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