Sludge Recirculation Pump QJB-W, Sewage Treatment Wall-Mounted Pump, Mixed Liquor Recirculation Denitrification and Nitrogen Removal Equipment

Supply Scope of Jiangsu Du'an Environmental Protection Return Pump:

The Jiangsu Du'an Environmental Protection Internal Return Wall-mounted Pump should be a complete set of equipment, and must be equipped with necessary accessories for safe operation, including a local control box, stainless steel dual guide rods, stainless steel lifting chains, cantilever, lifting hoist, wall-penetrating pipe, flap gate, and cables from the control box to the equipment.

Technical Description of QJB-W Sludge Return Pump:  

The QJB-W Sludge Return Pump is a new product developed based on submerged mixer production technology. This pump is a specialized equipment for mixed liquor return and denitrification in secondary wastewater treatment plants. It can also be used for pumping purified water during surface drainage, irrigation, controlling waterway systems, and in applications requiring low head and high flow rates, such as recirculation in wastewater treatment processes or slurry suction circuits.

The QJB-W Sludge Return Pump is equipped with a technically advanced axial-flow three-blade impeller, which features excellent self-cleaning and anti-vibration functions. The impeller design meets the requirements for both high flow and low head, generating high flow axially. It adopts the sealing technology of Swedish Flygt submersible motors to ensure safe and reliable sealing. When water enters the oil chamber, the humidity sensor in the probe leakage detection system will automatically send an alarm signal for timely detection and prevention of secondary failures. The motor windings of the QJB-W Submersible Return Pump use the internationally advanced safest overheating protection process. In case of overheating due to motor overload, high medium temperature, or other reasons, the temperature sensor will send an alarm signal or automatically shut down the pump before the temperature exceeds the allowable limit.

The QJB-W Sludge Return Pump is equipped with a single-guide rail automatic coupling system, ensuring quick installation, lifting, and maintenance. Developed based on the digestion and absorption of foreign similar product technologies, it features high efficiency, anti-clogging, anti-wrapping, automatic coupling, high reliability, and automatic control. It has unique functions in discharging solid particles and long-fiber debris. The QJB-W Submersible Return Pump is a self-developed product based on the introduction of German submersible motor production technology. It is a specialized equipment for mixed liquor return and denitrification in secondary wastewater treatment plants and can also be used in applications requiring low head and high flow rates, such as surface drainage, irrigation, and recirculation in wastewater treatment processes.

The QJB-W Sludge Return Pump offers low head, high flow, and high efficiency. The impeller features a high-performance hydraulic design structure, with swept-back blades that have self-cleaning functions, resisting clogging and wrapping. It uses new sealing materials, two mechanical seals made of tungsten carbide–tungsten carbide, imported bearings, and all fasteners are stainless steel, enabling the pump to operate safely and continuously for over 10,000 hours. The QJB-W Submersible Return Pump has a compact structure, simple operation and maintenance, easy installation and repair, and a long service life. The main unit adopts a cast or stainless steel pressure-filled molding structure, with small size, high density, corrosion resistance, and no noise. It is equipped with protection and alarm devices for leakage, water ingress, and motor overload, ensuring the safety and reliability of the product.

Supply Scope of Jiangsu Du'an Environmental Protection Sludge Return Pump:

The Jiangsu Du'an Environmental Protection Internal Return Wall-mounted Pump should be a complete set of equipment and must be equipped with necessary accessories for safe operation, including a local control box, stainless steel dual guide rods, stainless steel lifting chains, cantilever, lifting hoist, wall-penetrating pipe, flap gate, and cables from the control box to the equipment.

Supply Scope (including but not limited to the following):

(1)  Fully assembled internal return pump

(2)  Monitoring unit

(3)  Complete lifting device

(4)  At least 10m of underwater cable provided for each pump

(5)  All connecting accessories, embedded parts, anchor bolts, etc.

After-Sales Service of Du'an Environmental Protection Equipment (Jiangsu) Co., Ltd.:

After-sales service is crucial for the company's business development and establishing its reputation, and it is also an important step for the company's progress.

For users, it is a guarantee of product quality and peace of mind.

1. Adhere to the principle of customer first. All products produced by our company meet strict enterprise standards and national mechanical department standards.

2. Provide spare parts, installation, debugging, maintenance services, and technical training for relevant personnel of customers in a timely manner according to customer needs or agreements.

3. For large-scale engineering projects, organize production, testing, and inspection according to the requirements of the bidding documents, and cooperate with on-site acceptance by customers.

4. Strictly follow the ISO9001 standard for the procurement of raw materials and components, as well as the production and inspection of products.

5. Under normal storage, transportation, maintenance, and usage conditions by the customer, if the product cannot be used normally due to manufacturing quality issues, provide a three-guarantee service (warranty, return, exchange).

6. Provide necessary technical documents and product qualification certificates for products leaving the factory.

7. During the warranty period, if the equipment fails to meet the specified technical parameters due to errors in the equipment or technical documents provided by us when the user operates reasonably according to the relevant technical data, the user shall immediately notify us. We will replace/repair the defective equipment or technical documents within 24 hours after receiving written or telephone notice.

8. If damage or malfunction occurs due to improper use by the user or outside the warranty period, our company provides lifelong maintenance services for the product.

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