Description
DAGYEE Low-Speed Submersible Flow Generator – High-Thrust Circulation for Oxidation Ditches & Large Basins
A low-speed submersible flow generator is a specialized version of a submersible mixer designed for high-thrust, low-speed circulation in large tanks and oxidation ditches. Unlike high-speed mixers that focus on local agitation, these units generate a directed jet of high-velocity water that entrains surrounding fluid, creating a circulating current that sweeps the entire basin floor. This flow keeps solids suspended, maintains uniform mixing, and supports biological processes such as denitrification and phosphorus removal.
The mixer works by rotating a large-diameter propeller at low speed (typically 36-150 RPM), which creates axial thrust and broad, gentle flow. The flow pattern covers the full tank volume without breaking the surface or creating excessive shear that could damage biological floc. These units are essential for oxidation ditches, anoxic zones, and large equalization basins where maintaining continuous circulation is critical.
DAGYEE low-speed submersible flow generators are robust, energy-efficient, and designed for the demanding conditions of wastewater treatment.
Submersible Mixers principle
The Process Flow:
Step 1: Submersion
The unit is fully submerged in the tank and typically suspended from a guide rail system for easy installation and retrieval. The IP68-rated motor housing ensures watertight operation at depths up to 20 meters.
Step 2: Flow Creation
The large-diameter propeller rotates at low speed, drawing liquid in from the front and pushing it outward in a directed stream. The propeller is designed with a backward-swept, self-cleaning geometry that prevents debris entanglement.
Step 3: Circulation
The jet entrains surrounding fluid, multiplying the primary flow and creating a circulating current that sweeps the tank floor. This flow pattern lifts settled solids back into suspension and maintains a homogeneous mixture throughout the entire basin.
Step 4: Biological Support
The gentle circulation preserves biological floc structure and maintains the required flow velocity for activated sludge processes. Mixed use with aeration systems can significantly reduce energy consumption and prevent precipitation.
Submersible Mixers Parameter
| Model | Power (kW) | Current (A) | Rotary speed (rpm) | Impeller diameter (mm) | Force (N) | Weight (kg) |
|---|---|---|---|---|---|---|
| SMB0.85/8-260/3-740/C/S | 0.85 | 3.4 | 740 | 260 | 163 | 55/58 |
| SMB1.5/6-260/3-980/C/S | 1.5 | 4.4 | 980 | 260 | 290 | 55/58 |
| SMB2.2/8-320/3-740/C/S | 2.2 | 5.9 | 740 | 320 | 582 | 74/77 |
| SMB4/6-320/3-980/C/S | 4 | 10.8 | 980 | 320 | 609 | 74/77 |
| SMB1.5/8-400/3-740/S | 1.5 | 5.6 | 740 | 400 | 382 | 76/80 |
| SMB2.5/8-400/3-740/S | 2.5 | 7.3 | 740 | 400 | 575 | 76/80 |
| SMB3/8-400/3-740/S | 3 | 8.6 | 740 | 400 | 642 | 78/82 |
| SMB4/6-400/3-980/S | 4 | 10.3 | 980 | 400 | 1010 | 80/84 |
| SMB4/12-620/3-480/S | 4 | 14 | 480 | 620 | 1230 | 240/245 |
| SMB5/12-620/3-480/S | 5 | 18.2 | 480 | 620 | 1420 | 240/245 |
| SMB7.5/12-620/3-480/S | 7.5 | 28 | 480 | 620 | 1963 | 255/270 |
| SMB10/12-620/3-480/S | 10 | 32 | 480 | 620 | 2361 | 255/270 |
Energy-saving Submersible Mixers Selection
This explosion-proof submersible mixer is exclusively suitable for high-risk industrial scenarios such as petrochemical plants, oil refineries, natural gas enterprises and coal chemical factories, targeting flammable, volatile and oil-containing wastewater treatment. It solves the defect of high energy consumption of traditional explosion-proof mixing equipment, equipped with high-efficiency energy-saving explosion-proof motor, which reduces invalid power consumption on the premise of meeting industrial explosion-proof safety standards. It is the only safe and energy-saving preferred stirring equipment for special dangerous sewage treatment projects, perfectly balancing safety performance and operating cost control.
Submersible Mixers Installation Method
Dagyee explosion-proof submersible mixer adopts heavy-duty full explosion-proof guide rail lifting installation system as standard. All installation accessories including guide rails, brackets, fasteners and bottom bases are made of anti-static and anti-spark special metal materials, which will not generate impact sparks during water flow impact and equipment operation. The modular lifting structure supports free underwater lifting, inspection and maintenance without draining tank water or shutting down the dangerous treatment system, ensuring continuous safe operation of the project. For special limited-space explosion-proof tanks, customized fixed anti-explosion suspension installation schemes can be provided to adapt to special tank structure requirements.
Submersible Mixers Factor
- Selection Factor: Strictly select matching explosion-proof grade and power model according to project hazard level, sewage flammability and tank volume parameters.
- Operation Factor: Prohibit frequent start-stop and overload operation, keep standard diving depth to avoid idle running and spark hidden dangers.
- Safety Factor: Regularly detect explosion-proof sealing performance and electrical isolation structure to eliminate potential safety hazards in dangerous working conditions.
- Maintenance Factor: Professional staff must conduct regular inspection, replace aging explosion-proof accessories regularly to maintain long-term safety performance.
Submersible Mixers Features
Low-Speed, High-Thrust Design
The large-diameter propeller generates high thrust at low rotational speed, creating gentle but effective circulation. This design reduces energy consumption and prevents shear damage to biological floc.
Self-Cleaning Propeller
The backward-swept propeller geometry sheds debris during operation, preventing entanglement and clogging. The propeller is made from stainless steel or composite materials for corrosion resistance.
Double Mechanical Seals
Two mechanical seals provide backup protection against water ingress. The seals are made from wear-resistant materials such as silicon carbide and carbon. A 3-chamber sealing system provides additional reliability.
IP68 Protection
The motor is rated IP68 for continuous operation under water at depths up to 20 meters.
Guide Rail System
The unit slides on guide rails and can be lifted out for maintenance without draining the tank. This reduces downtime and eliminates confined-space entry risks.
Temperature Monitoring
The motor winding is equipped with temperature monitoring to prevent overheating.
Submersible Mixers Application
Oxidation Ditches
Creates the necessary flow velocity (typically 0.15-0.3 m/s) to maintain solids suspension throughout the channel. The low-speed, high-thrust design ensures complete circulation without surface disturbance.
Anoxic and Anaerobic Zones
Provides gentle mixing without introducing oxygen, maintaining the proper environment for denitrification and phosphorus removal. The axial flow pattern keeps solids in suspension while avoiding surface aeration.
Equalization Basins
Prevents solids deposition and maintains a homogeneous mixture through continuous circulation.
Activated Sludge Tanks
Maintains mixed liquor suspended solids (MLSS) in suspension and promotes contact between microorganisms and substrate.
Sludge Storage Tanks
Maintains sludge in suspension before dewatering or further processing.
Large-Volume Mixing
Suitable for tank volumes from 50 to 5000+ m³. Multiple units can be arranged for optimal coverage in very large basins.
Why Choose DAGYEE Low-Speed Flow Generator?
| Feature | Customer Value |
|---|---|
| Energy Efficiency | Low-speed, high-thrust design reduces energy consumption by up to 50% compared to conventional mixers |
| Self-Cleaning Propeller | Backward-swept design prevents debris entanglement and clogging |
| Reliable Sealing | Double mechanical seals and 3-chamber system ensure long-term reliability |
| IP68 Submersible | Fully submersible, suitable for depths up to 20 m |
| Gentle Circulation | Low-speed operation preserves biological floc structure |
| Guide Rail System | Easy installation and retrieval without draining the tank |
| Corrosion Resistant | Stainless steel or composite materials for long service life |
| Temperature Monitoring | Motor protection for reliable continuous operation |
Supplier Information
DAGYEE low-speed submersible flow generators provide efficient, high-thrust circulation for oxidation ditches, anoxic tanks, and large basins. Designed for continuous operation and easy maintenance, they are the ideal choice for activated sludge treatment, denitrification, and sludge holding applications.
Contact our team for a free consultation and flow generator selection for your application.
