Submersible Agitator Mixer

Submersible Agitator Mixer generates a continuous water flow, ensuring sufficient contact between suspended solids, activated sludge, and the substrate in wastewater. This prevents sludge from settling at the bottom of the tank, thus ensuring efficient biochemical reactions.

In aeration tanks, they alter the rising path of air bubbles, increasing the "oxygen transfer depth" and significantly improving oxygen transfer efficiency while reducing energy consumption.

The submersible agitator mixer differs significantly from traditional mixing methods in several ways, primarily in its working environment, structural design, and energy efficiency.

Working Environment and Method:

The submersible agitator mixer is specifically designed for underwater environments and can operate submerged in liquids (such as wastewater and sludge) for extended periods. By rotating its impeller, it directly generates jets that mix materials underwater, achieving propulsion, preventing sedimentation, and promoting mass transfer. Traditional mixing methods typically operate on land or within containers, with the main body of the equipment above the liquid surface. Materials are mixed in open or closed containers using agitators, making them unsuitable for underwater operations.

Structural and Design Features:

Our submersible mixers feature a compact, waterproof, and corrosion-resistant design. Key components (such as motors and cables) have high protection ratings (e.g., IP68) and are equipped with swept-back blades that prevent tangling and provide self-cleaning. Additionally, they include multiple sealing and protection devices (such as leak sensors and overheat protection) to ensure safe and stable operation in harsh underwater environments. Traditional mixing equipment has relatively diverse structures but typically does not need to withstand the harsh conditions of underwater high pressure and corrosion.

Energy Efficiency and Intelligence:

Our energy-saving models offer significant energy savings of 30%–50% and can be equipped with an intelligent control system to automatically adjust power. The energy efficiency of traditional mixing methods varies depending on the type of equipment, and their level of intelligence is relatively low, often relying on manual adjustments.

The core working principle relies on the synergistic effect of the motor and the impeller: the motor drives the impeller to rotate at high speed, generating powerful water flow that causes the water to spiral in the axial direction, forming an axial driving force, while centrifugal force generates a swirling jet.

Highly efficient and energy-saving: Utilizing a direct-drive structure or a low-speed, large-impeller design, it generates a large water flow at low power, achieving efficient mixing and flow propulsion. Our energy-saving mixers are over 30% more energy-efficient than traditional equipment.

Highly adaptable: Suitable for environments with varying water quality, temperature (up to 40°C), depth (generally not exceeding 20 meters), and pH (5–9). It is widely used in aeration and anaerobic tanks for municipal and industrial wastewater treatment.

Compact structure, easy installation and maintenance: The equipment is small and lightweight, featuring a base-mounted or rail-mounted design, which eliminates the need for a dedicated machine room and facilitates rapid installation and maintenance both above and below water.

Anti-clogging and self-cleaning design: The impellers often feature a swept-back hydraulic design or are made of fiberglass, polyurethane, or other materials, with a self-cleaning function that effectively prevents fibers, sludge, and other debris from tangling, reducing downtime for maintenance.

High reliability and safety: The motor insulation class is F, with a protection rating of IP68, and it is equipped with double mechanical seals.

Improved treatment efficiency: When used in conjunction with an aeration system, it enhances oxygen transfer efficiency, increases oxygenation, effectively prevents sludge sedimentation, and strengthens biochemical processes such as nitrification, denitrification, and phosphorus removal.

Municipal Wastewater Treatment: Primarily used in various process units of wastewater treatment plants.

Aeration Tank: High-speed mixing equipment works in conjunction with the aeration system to enhance mixed liquor circulation, prevent localized anoxic conditions, and improve microbial treatment efficiency.

Anaerobic Tank: Low-speed, plug-flow equipment generates low tangential flow, maintaining sludge suspension, ensuring anaerobic bacterial activity, and promoting nitrification, denitrification, and phosphorus removal.

Secondary Settling Tank and Return Flow Zone: Low-speed, plug-flow equipment creates a directional flow field to prevent sludge deposition and reduce energy consumption in the return flow system.

Sludge Thickening Tank: Maintains uniform sludge concentration through a low-speed, large-impeller structure, preventing bottom caking.

Industrial Wastewater Treatment: For complex industrial wastewater, submersible mixers often require customized designs.

Equalization Tank: Used for rapid homogenization of wastewater with varying concentrations, preventing suspended solids and fibers from settling.

Anaerobic Reactor: Maintains sludge suspension to ensure anaerobic treatment efficiency.

Special Media Treatment: For highly corrosive industrial wastewater with high solids content, equipment must be made of corrosion-resistant, high-strength materials.

Water Environment Treatment and Ecological Restoration: In rivers, lakes, and landscape water bodies, submersible mixers are used to improve water flow.

Breaking Water Stratification: Increases dissolved oxygen content in water bodies.

Inhibiting Algae and Sediment Accumulation: Reduces nutrient enrichment through continuous water flow disturbance.

Constructing Overall Circulating Flow: Improves water quality stability and the self-purification capacity of water bodies.

Other Industrial Applications: Submersible mixers are also used in chemical, food processing, and other industries for mixing and agitating reaction vessels, storage tanks, slurries, etc.

Protection Class: IP68

Sealing: Employs a double-end mechanical seal and is equipped with a leakage sensor to ensure long-term, leak-free operation, even at water depths of up to 20 meters.

Material Corrosion Resistance: Key components (such as impellers, housings, and fasteners) are typically made of stainless steel (e.g., 304 or 316L) to withstand corrosive environments like sewage and industrial wastewater, ensuring a long equipment lifespan.

Insulation Rating: The motor winding insulation is typically Class F, ensuring electrical safety in humid environments.

Main Structural Components

Submersible Motor: Waterproof design, squirrel-cage asynchronous motor, resistant to underwater pressure and corrosion.

Impeller: The core component that generates water flow; its design (e.g., swept-back type) and material directly affect mixing efficiency and anti-winding performance. Impeller materials vary.

Sealing System: To prevent water from seeping into the motor, a double mechanical seal is typically used. The sealing surface is made of silicon carbide, offering extremely high wear resistance and sealing performance, with a long design life (over 25,000 hours). It is also equipped with leak detection and motor winding overheat protection.

Installation System: Optional system designed to facilitate equipment installation, maintenance, and repair. Operation can be completed without emptying the wastewater tank.

Other Components: Imported NSK bearings; cables are corrosion-resistant and waterproof.

Installation & Maintenance
Guide Rod Installation: The mixer is guided vertically up and down via guide rods fixed to the tank wall or bottom, facilitating maintenance and eliminating the need for drainage.

Installation System I: Suitable for pool depths (H < 4m). Uses a handheld or vertical guide rod, requiring no pre-drilled holes, and is secured with expansion bolts.

Installation System II: Suitable for pool depths (H > 4m). Uses a guide rope instead of a guide rod to reduce the risk of deformation during transportation. Requires a concrete foundation or steel structure base at the bottom of the pool.

Installation System III: Combines a hand-cranked hoist-type guide rod, supporting horizontal rotation. Suitable for deep pools or complex structures.

Cantilever Installation: Fixes the small mixer to a cantilever beam, which is clamped or bolted to the pool wall. The guide rod length is generally no more than 3m. Suitable for shallow pools with limited space.

Ground Installation (Base/Anchored): The mixer is fixed to a base and submerged at the pool bottom. Commonly used in shallower pools or ponds, requiring no complex support structure.

Before Installation: Check the equipment model, cable sealing, and pool bottom flatness. During installation, ensure the cable is securely fixed to avoid tangling with the impeller.

We provide detailed installation and operation instructions and will send the instruction manual to the customer in a timely manner.

Customized Services

Model and Specification Customization: We select or design suitable models based on parameters such as tank size, water depth, and media characteristics (e.g., viscosity, density, solids content). For example, the impeller diameter (e.g., 260mm, 400mm, 620mm), speed (e.g., 740rpm, 980rpm), and power (from 0.85kW to 100kW) of the QJB series submersible mixers can be adjusted as needed.

Material Customization: Core components (e.g., impeller, casing) can be made of 304 or 316L stainless steel to withstand highly corrosive industrial wastewater environments.

Functional Module Customization: Optional flow guides can be added to optimize water flow direction, or an integrated intelligent control system can be implemented to provide functions such as remote monitoring, overheat protection, and leakage alarms.

Installation Method Customization: We offer different installation systems to accommodate various tank structures (e.g., radial flow sedimentation tanks, equalization tanks).

Engineering Support Services

Selection: We use CFD (Computational Fluid Dynamics) for equipment selection.

On-site Installation Guidance: We provide installation drawings and technical specifications to ensure proper water immersion, secure installation, and electrical connections of the equipment.

After-sales Maintenance: This includes one year of free spare parts supply (such as mechanical seals and bearings) and troubleshooting support.

Standard: GB/T 33566-2017

Factory Testing Process: Professional quality assessment typically includes the following steps to ensure the equipment conforms to the standard:

Document Review: Verify the factory certificate of conformity, instruction manual, and other documents to ensure the parameters are consistent with the requirements.

Appearance and Static Inspection: Inspect the impeller, cables, and casing for defects; use calipers, megohmmeters, and other tools to measure dimensions, insulation resistance, and other relevant metrics.

Dynamic Performance Testing:

No-Load Operation: Check for abnormal noises, ensure the speed and current are normal, and monitor the bearing temperature.

Load Test: Using a testing platform, the equipment will be tested in a wastewater tank before leaving the factory to measure agitation speed, current, voltage, and other data to ensure product quality. A test report can be issued.

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