Mixing Agitator Supplier in Bangladesh
Gear-motor mixing agitators for flash mixing, flocculation and chemical mixing in ETP, WTP and STP plants, supplied with installation and after-sales support by Techno Bangla Creation.
What Is a Mixing Agitator?
A mixing agitator is a motor-driven mixer that turns an impeller on a shaft inside a tank. It blends liquids, spreads chemicals and keeps solids from settling. The unit has a drive (motor and gear), a shaft guide (lantern with bearing), a shaft and impellers. In ETP, WTP and STP plants it is used for chemical mixing, flash mixing and flocculation.
An agitator is not an aerator. It moves liquid but does not add air. For oxygen supply, see our submersible aerator. To feed chemicals into the mixing tank, see our chemical dosing pump.
- Gear motor drive with output speed of 25 to 200 rpm
- Motor power from 0.5 to 10 HP for small to medium tanks
- Suited to flash mixing, flocculation and chemical mixture tanks
- Installation and after-sales support in Bangladesh
Mixing Agitator Specifications
- Type
- Gear-motor mixing agitator with shaft and impellers
- Main parts
- Drive (motor and gear), shaft guide (lantern with bearing), shaft, impellers
- Output speed
- 25 ~ 200 rpm
- Motor power
- 0.5 ~ 10 HP (about 0.37 ~ 7.5 kW)
- Application
- ETP, WTP, STP, Chemical Mixture, Flash Mixture, Flocculation
- Origin
- China
Exact speed, motor, shaft length, impeller type and material depend on the model and your tank. Send us your tank size and duty and our engineers will confirm the right agitator.
Flash Mixing vs Flocculation Mixing
Both use an agitator, but they need very different speeds. Mixing too hard in flocculation breaks the floc.
| Feature | Flash (Rapid) Mixing | Flocculation Mixing |
|---|---|---|
| Purpose | Spread coagulant through the water quickly so particles destabilise | Bring destabilised particles together so they grow into settleable floc |
| Mixing intensity (G) | High. Design guides cite from several hundred to about 1000 s-1 | Low. Design examples use roughly 20 to 75 s-1 |
| Typical time | Seconds. Commonly about 20 to 60 s | Minutes. Often 20 to 30 minutes or more |
| Paddle tip speed (design examples) | Around 1.75 to 2 m/s | Around 0.25 m/s, much gentler |
| If set wrong | Poor coagulant dispersion and weak treatment | Too fast breaks floc, too slow leaves fine particles |
| Best fit | First chemical tank after the coagulant dose | Slow-stir tank between flash mix and settling |
Values are typical figures from water treatment design guides and regulations. Real settings come from jar tests and your plant design. Always confirm against the datasheet of the exact model.
How a Mixing Agitator Works
- Motor TurnsThe electric motor runs at its normal high speed.
- Gear Reduces SpeedThe gearbox slows the output to a mixing speed, such as 25 to 200 rpm, and raises torque.
- Shaft Carries TorqueThe shaft runs through the lantern with bearing, which guides it and keeps it steady.
- Impeller Moves LiquidThe blades push the liquid and set up a flow pattern through the tank.
- Chemicals BlendCoagulant, dosed chemicals or polymer spread evenly, and solids stay suspended.
Key Benefits
Chemical treatment only works as well as the mixing behind it.
- Even chemical dispersion, so coagulant and pH chemicals reach the whole tank quickly
- Output speed range of 25 to 200 rpm covers slow flocculation and faster mixing duties
- Suitable for gentle, low-shear mixing of polymer solutions when the right speed and impeller are chosen
- Keeps solids and chemicals from settling in mixing and holding tanks
- Gear motor drive from 0.5 to 10 HP fits small to medium treatment tanks
- Local engineering and after-sales support from Techno Bangla
Which Impeller Type Fits Your Tank?
Impeller shape sets the flow pattern. Confirm which impeller types are available for your model.
Choose an Axial-Flow Impeller When
- The liquid is thin, like water or dilute chemical solution
- You need fast blending or solids kept in suspension
- The tank can have baffles to stop swirling
- You want strong top-to-bottom flow for the power used
- Typical types: propeller, pitched blade, hydrofoil
Choose a Radial or Paddle Impeller When
- The liquid is thick or needs solids broken up
- The job is gentle, low-speed flocculation
- The tank is long or shallow
- Shear must stay low, as with polymer make-down
- Not sure? Send your tank data and our engineers will advise
Where Mixing Agitators Are Used
Any tank where liquid, chemicals or solids must be kept moving and well mixed.
- Flash Mixing
- Flocculation
- Coagulant Tank
- Polymer Make-Down
- Chemical Mixture Tank
- pH Neutralization Tank
- ETP
- WTP
- STP
- Textile Dyeing Effluent
How to Choose the Right Mixing Agitator
Share these details with our engineers and we will recommend a suitable model and size.
- Mixing duty. State whether the tank is for flash mixing, flocculation, chemical mixing or holding. Each needs a different speed and intensity.
- Tank size and shape. Give volume, diameter, liquid depth and whether baffles exist. This sets shaft length and impeller size.
- Liquid and chemicals. Note viscosity, solids content and chemicals such as alum, ferric, lime or acid. Confirm shaft and impeller material for your liquid.
- Speed and shear. Activated polymer is shear sensitive, so it needs a slow, low-shear mix. Ask about variable speed if one tank serves several duties.
- Do not size by rule of thumb. Mixer makers note that old W/m3 or HP per volume rules are poorly defined. Give us your tank data for a proper selection.
Why Mixing Matters in a Bangladesh ETP
Textile dyeing factories in Bangladesh must run an ETP, and treated effluent going to inland surface water is held to a pH band of 6 to 9. Raw dyeing wastewater can sit well outside that band, so neutralisation and chemical treatment tanks need steady mixing.
A good agitator makes sure pH chemicals and coagulant reach all the water. Pair it with an EMEC online analyzer to watch pH in the tank. See our ETP plant page for complete plant solutions.
Installation and After-Sales Support
Techno Bangla Creation supplies treatment plant equipment together with installation, commissioning and after-sales support for factories, businesses and organizations across Bangladesh.
Our team is based in Mohakhali, Dhaka. Send your tank data and our engineers will recommend a suitable agitator. See the water treatment plant page for WTP solutions.
Frequently Asked Questions
What is a mixing agitator?
A mixing agitator is a motor-driven mixer that spins an impeller on a shaft inside a tank. It blends liquids, spreads chemicals and keeps solids suspended. The unit is made of a drive (motor and gear), a shaft guide with bearing, a shaft and impellers. In treatment plants it serves chemical mixing, flash mixing and flocculation.
What is the difference between flash mixing and flocculation?
Flash mixing spreads coagulant through the water in seconds with high mixing intensity. Flocculation then stirs gently for many minutes so small particles join into larger floc that settles. Design guides use much lower intensity and tip speed for flocculation. Too much speed there breaks the floc apart.
What speed and motor power do you supply?
Our mixing agitators cover an output speed of 25 to 200 rpm and motor power of 0.5 to 10 HP, which is about 0.37 to 7.5 kW. Exact speed, shaft length and impeller depend on the model and your tank, so we confirm the right configuration from your tank data.
How long should flocculation mixing run?
Water treatment rules and textbooks commonly call for at least 20 to 30 minutes of low-intensity flocculation, with about 30 minutes typical. Wastewater plants vary with the effluent and chemicals used. Jar tests give the best time for your water, so use test results to set the tank design and speed.
Can the agitator mix polymer solution?
Yes, if speed and impeller suit the job. Activated polymer is shear sensitive, and too much stirring can break its long chains and cut its strength. Some suppliers size polymer mixers for about 90 to 100 rpm. Tell us the polymer type and tank volume so we can advise on speed and impeller.
Which is better, an axial or radial impeller?
Neither is better for every job. Axial impellers such as propellers and hydrofoils move liquid top to bottom, which suits thin liquids, blending and suspending solids. Radial or paddle types suit thicker liquids, dispersion and gentle flocculation. The right choice depends on your liquid, tank shape and mixing duty.
How do I size an agitator for my tank?
Send the tank volume, diameter, liquid depth, liquid properties and mixing duty. Engineers size the agitator from these, not from a single power-per-volume rule, because such rules of thumb are poorly defined and depend on mixer type. We then confirm motor power, speed, shaft length and impeller.
How can I get a quotation for a mixing agitator?
Send your tank size, liquid, mixing duty and required speed to our engineers by phone or email. We reply with a free quotation for your ETP, WTP, STP or water treatment equipment.
