Anti-Clog Submersible Sludge Recirculation Pump for Wastewater Treatment

Product Specification

Anti-Clog Submersible Sludge Recirculation Pump for Wastewater Treatment

Brief Description

The QJB-W submersible sludge recirculation pump is specially developed for nitrified liquid recirculation in sewage treatment processes. Adopting a low-head, high-flow design with extra-wide flow passages, it delivers reliable anti-clog performance. Constructed entirely from stainless steel for outstanding corrosion resistance, the pump allows continuous submerged operation. It is extensively used for recirculating sludge and mixed liquor within anoxic and anaerobic tanks at municipal wastewater treatment plants, stabilizing the sludge balance of biochemical treatment systems.

Product Overview

This recirculation pump features a stamped stainless steel submersible pump casing as the core conveying component. With a specific speed up to 1600, it generates massive flow at an ultra-low head (minimum 0.5m), perfectly suited for sewage recirculation processes requiring minimal liquid level difference and large circulating volume. Its hydraulic profile is optimized via CFD fluid simulation. Backward-swept wide blades eliminate narrow clearances, enabling smooth passage of solid particles and fibrous contaminants to prevent winding and clogging. The close-coupled motor-pump structure minimizes mechanical power loss and improves total efficiency. The all-stainless steel integrated design features a streamlined profile, fewer spare parts and high universal standardization. Fitted with an automatic rail coupling installation system, the pump can be hoisted out for inspection and maintenance without emptying the entire tank.

Working Principle

The submersible motor drives the impeller to rotate steadily, axially propelling mixed liquor through the wide flow channels. By virtue of its ultra-large circulating capacity, it transports mixed liquor and activated sludge from the aerobic tank back to the anoxic and anaerobic tanks to fulfill the nitrification and denitrification processes for total nitrogen removal. Its low-head design is perfectly adapted to inter-tank liquid transfer, cutting energy consumption and significantly enhancing total nitrogen removal performance.

Product Parameters

Key Design & Performance Features

1. Low-head and high-flow design: High specific speed delivers large circulation volume, perfectly suited for internal sludge recirculation.

2. Anti-clogging and anti-winding structure: Wide flow channels and backward-swept blades effectively prevent blockage caused by fibrous substances and solid sediments.

3. All-stainless steel construction: Outstanding acid and alkali corrosion resistance, suitable for both municipal and industrial wastewater conditions.

4. CFD-optimized hydraulic model: Ensures low power consumption and high operational efficiency.

5. Automatic rail coupling mounting system: Allows easy hoisting, convenient underwater installation and routine maintenance.

6. IP68 waterproof motor with Class F insulation: Equipped with anti-condensation heaters and dual tungsten carbide mechanical seals to ensure stable, leak-free and long-term submerged operation.

Applications

This pump is widely applied for nitrified liquid recirculation in AO processes and oxidation ditches of municipal wastewater treatment plants. It is also suitable for wastewater circulation in printing and dyeing, food processing and chemical industries, as well as large-flow and low-head water circulation for various water tanks and biochemical pools.

Operating conditions:

1. Maximum altitude: ≤ 2000 m; Maximum ambient temperature: 50 ℃

2. Applicable pH range: 3 ~ 12

3. Maximum liquid density: ≤ 1150 kg/m³

4. Maximum submersion depth: ≤ 20 m

5. Power supply: 380 V / 50 Hz

6. Maximum diameter of passable solid particles: ≤ 50% of pump outlet diameter

Company Profile

WESUS is a leading manufacturer and total solution provider for advanced sewage and sludge treatment systems. Founded in Yixing, China in 2013, we offer reliable, cost-effective equipment and engineering services to global clients. Certified with ISO 9001, ISO 14001 and ISO 45001, we boast strong in-house R&D and manufacturing capabilities supported by a large production base, a professional technical team, patents and university cooperation. Our comprehensive product range includes screening, filtration, sludge dewatering, mixing, aeration and customized solutions. With end-to-end services from design to after-sales support and proven global project experience, we have earned wide recognition including national high-tech enterprise and 5-star after-sales certifications. Adhering to the philosophy of real innovation, excellence and win-win cooperation, WESUS is committed to providing smart, sustainable water treatment solutions for municipal and industrial clients worldwide.

FAQ

Q1: Are you a direct manufacturer? What certifications do you hold?
A: We are a direct manufacturer with our own production facilities and R&D team. We maintain full control over quality, cost, and delivery, and hold certifications including ISO 9001/14001 for our core products.

Q2: What types of collaboration models do you offer?
A: We provide flexible solutions:
- Equipment Supply: Standalone or packaged systems.
- Turnkey Solutions (EPC): Design, procurement, construction, and commissioning.
- Technical Cooperation: Process upgrades, operational maintenance support, and technical consulting.

Q3: How is after-sales service and support ensured?
A: We provide full lifecycle support:
- Warranty: 12–24 months on core equipment.
- Response: 7x24 remote support with fast on-site assistance when needed.
- Spare Parts: Genuine parts are stocked for long-term supply security.
- Maintenance: Annual Maintenance Contracts (AMC) are available to ensure long-term system efficiency.

Q4: What is your typical project execution process?
A: Our standardized workflow ensures efficiency and transparency:
1. Requirement Analysis → 2. Proposal & Quotation → 3. Design Finalization → 4. Production & Factory Testing → 5. Shipping & Installation → 6. Commissioning & Training → 7. After-sales Service.
Customer involvement is encouraged at key milestones.

Q5: Can you provide references or case studies?
A: We have extensive global project experience across municipal and various industrial sectors. We can provide detailed, anonymized case studies and client references upon request.

Q6: What are your payment terms and delivery lead times?
A: - Payment: We accept T/T and L/C, with standard industry progress payment terms.
- Lead Time: Standard equipment: 4–8 weeks. Large custom projects: 12–20 weeks.
A clear production schedule is provided upon contract signing.

Q7: How do you serve international clients?
A: We are experienced in international projects, arranging complete logistics (FOB, CIF, DDP, etc.) and providing full customs documentation. Our designs pre-consider compliance requirements in target markets.

Q8: Can you upgrade or retrofit existing systems?
A: Yes. We specialize in evaluating existing facilities and providing customized retrofit and expansion solutions to enhance performance and capacity with minimal investment and downtime.

Q9: How can we start a consultation?
A: Please contact our Sales Engineering team. To facilitate an efficient discussion, please have your treatment requirements, water quality data, and site information ready. We will provide a preliminary proposal and professional advice.