一、 Overview
The submersible mixer is a core underwater mechatronic equipment in wastewater treatment projects. The whole unit operates fully submerged in water. Driven by a submersible motor, the impeller rotates to generate directional water flow for water mixing, sludge suspension and pool water circulation, ensuring stable biochemical treatment processes. It is widely used in various biochemical tanks for municipal sewage and industrial wastewater treatment.
二、 Working Principle
When powered on, the submersible motor drives the impeller to rotate at high speed and produces axial thrust and water turbulence to promote continuous water circulation in the tank. The flow keeps activated sludge and suspended solids in suspension, preventing sedimentation at the tank bottom and water stratification. It enables sufficient contact and mixing of sewage, sludge and microorganisms, creating stable hydraulic conditions for biochemical reactions such as nitrification, denitrification, nitrogen and phosphorus removal. Note: The submersible mixer mainly provides mechanical flow pushing without oxygen aeration function. It is commonly used in anaerobic and anoxic tanks. Combined operation with aeration equipment can improve aeration efficiency and reduce energy consumption.
三、 Equipment Structure
The submersible mixer mainly consists of submersible motor, mechanical seal assembly, impeller, bearing unit, power cable and guide rail lifting installation system:
1. Submersible Motor： Class F insulation, IP68 protection rating, capable of long-term continuous underwater operation, equipped with leakage and overheating protection. YE4 high-efficiency energy-saving motor is optional to cut long-term power cost.
2. Sealing System： Adopts double independent mechanical seals as two sealing barriers to prevent wastewater from entering the motor chamber and improve underwater operation reliability.
3. Impeller： Swept-back three-blade impeller optimized by fluid simulation with self-cleaning and anti-tangling performance to reduce winding by fibers and debris. Materials including polyurethane, 304 / 316 stainless steel are available for different corrosive water conditions.
4. Installation System：Guide rail plus hoisting device. The equipment can be lowered and lifted along the guide rail. No tank draining is required for maintenance, facilitating on-site service.
Two main series by function:
· Mixing Type： High rotating speed and strong shearing force, suitable for homogenization mixing of high-concentration solid-liquid medium in regulating tanks and sludge tanks.
· Low-speed Flow Propulsion Type： Large-diameter impeller, low rotating speed and high thrust with wide coverage, mostly used for water circulation in oxidation ditches and A²/O biochemical tanks.
四、 Main Advantages
1. Compact structure, less civil construction space： Underwater installation without motor room, greatly reducing civil engineering cost; low operating noise to improve working environment of the plant.
2. Anti-tangling & high reliability：。 Swept-back hydraulic impeller reduces risk of tangling and clogging, suitable for sewage containing fibers and hair.
3. Easy installation and maintenance：Guide rail lifting structure allows direct hoisting out of equipment for inspection without draining the tank, shortening downtime.
4. Corrosion resistance & long service life： Stainless steel or polyurethane materials optional, adaptable to corrosive media such as municipal sewage and chemical wastewater.
5. 24-hour continuous operation available, equipped with temperature control and leakage monitoring protection for fault early warning.
五、 Application Scenarios
· Municipal wastewater treatment: A²/O tanks, anaerobic tanks, anoxic tanks, SBR tanks, oxidation ditches, regulating tanks, sludge storage tanks.
· Industrial wastewater: mixing and homogenization for chemical, food, printing & dyeing and slaughter wastewater treatment.
· Others: biogas tank mixing, river water circulation, livestock manure tank mixing.
六、 Selection & Operation Tips
1. Calculate required thrust and circulation flow according to tank dimension, water depth and medium concentration to match proper power and impeller specifications.
2. The installation position shall avoid dead corners on tank walls with properly arranged angles to eliminate sediment dead zones.
3. Inspect cables, mechanical seals and bearings regularly. Self-cleaning impeller is preferred for sewage with abundant long fibers.
4. Long-time no-load test without water is forbidden to prevent motor damage caused by overheating.
七、 Conclusion
In wastewater biochemical treatment systems, submersible mixers are key equipment to maintain sludge suspension and guarantee biochemical reaction efficiency. With energy-saving development of environmental protection industry, high-efficiency submersible mixers, featuring low energy consumption, flexible installation and convenient operation & maintenance, have become standard equipment for new sewage projects and reconstruction of old wastewater plants, helping wastewater treatment systems operate stably and meet discharge standards.
We are a technology-based environmental protection equipment manufacturer integrating R&D and production. With extensive practical project experience, we can provide customers with equipment selection, technical consultation and full-cycle after-sales service. We look forward to cooperating with you.
Contact Information (WeChat available for the same numbers): Manager Lian: +86 18351837273 Manager Wang: +86 18951861322 Manager Dong: +86 15805149335 Manager Zhong: +86 17626046190 Manager Huang: +86 15951778306
