Roots Air BlowerSupplier in Bangladesh
Trundean TH, THS and THW series Roots (rotary lobe) air blowers from Taiwan for ETP, WTP and STP aeration, fisheries and pneumatic conveying, supplied with installation and after-sales support by Techno Bangla Creation.
What Is a Roots Air Blower?
A Roots air blower is a positive-displacement blower. Two interlocking lobed rotors trap air at the inlet and carry it to the outlet, so the air is delivered at a steady rate. In ETP, WTP and STP plants it supplies aeration air to diffusers in the biological tank, so bacteria get the oxygen they need.
A Roots blower is not a turbo blower. It moves fixed pockets of air and does not compress them inside the casing, while a turbo blower compresses air dynamically with a high-speed impeller. For the high-speed type, see our turbo blower page.
- Trundean TH, THS and THW series in one range
- Capacity of 1 to 70 m³/min and power up to 300 HP
- Suited to ETP, WTP, STP, municipal, fisheries and pneumatic conveying
- Installation and after-sales support in Bangladesh
Roots Air Blower Specifications
- Type
- Positive-displacement rotary lobe (Roots) air blower
- Series
- TH, THS, THW
- Capacity
- 1 ~ 70 m³/min (about 60 ~ 4200 m³/hr)
- Pressure
- 1000 ~ 10000 mmAq (about 9.8 ~ 98 kPa)
- Power
- 1 ~ 300 HP (about 0.75 ~ 224 kW)
- Application
- ETP, WTP, STP, Municipal, Fisheries, Pneumatic Conveying, Pressure Increase
- Brand
- Trundean
- Origin
- Taiwan
Exact capacity, pressure, motor, drive type and silencer depend on the series and model you select. Send us your duty point and our engineers will confirm the right size.
Trundean TH, THS and THW Series
Three Roots blower series in one range. Tell us your duty point and we will match the series and frame size.
TH Series
Trundean Roots air blower for aeration and conveying duty. Confirm frame sizes and ratings on the datasheet.
THS Series
Trundean THS type Roots air blower. Ask our engineers how it differs from the TH series for your duty.
THW Series
Trundean THW type Roots air blower. Confirm model details and ratings on the datasheet before ordering.
Roots Blower vs Turbo Blower vs Screw Blower
All three supply aeration air. They differ in principle, efficiency and cost, so each fits different plants.
| Feature | Roots (Lobe) Blower | Turbo Blower | Screw Blower |
|---|---|---|---|
| Working principle | Two lobes trap fixed pockets of air. No internal compression | High-speed impeller compresses air dynamically | Screw rotors compress air internally |
| Energy efficiency | Basic. Screw and turbo are reported to be up to about 35% more efficient than older positive-displacement blowers | High at steady, large flows | Higher than Roots, with savings of up to about 30% reported |
| Flow turndown | Typically to about 30% of full output with a speed drive, though slip limits it at low speed | Narrower, roughly 30 to 50% depending on pressure | Broad |
| Noise and pulsation | Strong pulsation. Needs a silencer and sound enclosure | Low | Typically lower than a tri-lobe Roots blower |
| Maintenance | Regular oil, gear, belt and filter checks. Simple to service | Mainly filters on air or magnetic bearing designs | Gears and bearings need regular checks |
| Initial cost | Lower | Higher | Medium to higher |
| Best fit | Small and medium plants, fisheries, varying pressure, conveying | Large plants with continuous, steady aeration | Continuous duty where power cost is the priority |
Values are typical figures from manufacturer and engineering sources. Real results depend on pressure, speed control and maintenance. Always confirm against the datasheet of the exact model.
How Does a Roots Blower Work?
- Motor Turns the RotorsA motor drives two lobed rotors that spin in opposite directions on parallel shafts.
- Timing Gears Keep Them ApartA pair of timing gears holds the lobes in step so they never touch.
- Lobes Trap and Carry AirEach lobe traps a pocket of air at the inlet and carries it around the casing to the outlet.
- System Sets the PressureThe blower moves air. The back-pressure of the pipe and tank sets the discharge pressure, so a relief valve protects the unit.
- Air Reaches the DiffusersA silencer smooths the pulses, and piping carries the air to air diffusers in the tank.
Key Benefits
Roots blowers are a proven, simple way to supply aeration air, especially for small and medium plants.
- Steady airflow that stays nearly constant when system pressure varies a little
- Simple design that is easy for plant operators to inspect and service
- Lower initial cost than turbo or screw blowers, as reported by manufacturers
- Wide range of 1 to 70 m³/min and up to 300 HP across three series
- Speed control can lower output to about 30% of full flow when demand falls
- Local engineering and after-sales support from Techno Bangla
Is a Roots Blower Right for Your Plant?
Choose a Roots Blower When
- The plant is small or medium and the budget is tight
- Pressure or airflow changes through the day
- You run fisheries, biofloc or pneumatic conveying
- You want a simple unit your team can service
Choose a Turbo or Screw Blower When
- Aeration runs continuously for many hours a day
- The plant is large and power cost is the main concern
- You need low noise without a large enclosure
- You can accept a higher initial cost for lower running cost
Where Are Roots Air Blowers Used?
Any process that needs steady low-pressure air, from effluent tanks to fish ponds.
- ETP Aeration
- Textile and Dyeing ETP
- STP Aeration
- WTP
- Municipal Treatment
- Fisheries and Aquaculture
- Biofloc Tanks
- Pneumatic Conveying
- Pressure Increase
How to Choose the Right Roots Blower
Share these details with our engineers and we will recommend a suitable series and size.
- Airflow from oxygen demand. Give your BOD or COD load, tank volume and target dissolved oxygen. This sets the airflow in m³/min.
- Pressure from tank depth. Every 1 m of water above the diffusers needs about 1000 mmAq (9.8 kPa), plus losses in the diffusers and pipes. Size the blower and diffusers together.
- Relief valve and silencer. Roots blowers need a relief valve on the discharge and should not be throttled. A silencer controls the noise from air pulsation.
- Hot, humid climate. Warm air is thinner, and one aeration guide reports blower output falling about 10 to 15% in a very hot blower room. Give the unit fresh, cool intake air and a clean filter.
- Standby and speed control. Plan a duty and standby unit, and ask about a variable speed drive. Use a thermal gas flow meter to track air use.
Why Does Blower Choice Affect Your Power Bill?
Aeration is usually the biggest electricity user in a biological plant, often reported at about 40 to 60% of total plant energy. The blower is the main part of that load, so its type, size and control matter.
Roots blowers cost less to buy but are reported to use more energy than screw or turbo blowers. For a small plant with short running hours, that trade-off often makes sense. For large, continuous aeration, compare running cost against our turbo blower.
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 details and our engineers will recommend a suitable Roots blower. See the ETP plant and sewage treatment plant pages for complete solutions.
Frequently Asked Questions
What is a Roots air blower?
A Roots air blower is a positive-displacement blower. Two interlocking lobed rotors trap air at the inlet and carry it to the outlet at a steady rate. In ETP, WTP and STP plants it supplies aeration air to diffusers, so bacteria receive oxygen. Techno Bangla Creation supplies Trundean TH, THS and THW series from Taiwan.
What is the difference between a Roots blower and a turbo blower?
A Roots blower traps fixed pockets of air between two lobes and does not compress them inside the casing. A turbo blower compresses air with a high-speed impeller. Turbo blowers are often more efficient at steady, large flows but cost more, while Roots blowers suit small and medium plants and varying pressure.
How do I size a Roots blower for an aeration tank?
Size it from airflow and pressure. Airflow follows your oxygen demand from BOD or COD load. Pressure follows tank depth: every 1 m of water needs about 1000 mmAq, plus diffuser and pipe losses. Send your tank volume, depth and oxygen demand, and our engineers will confirm the series and motor size.
Is a Roots blower energy efficient?
A Roots blower is a basic, proven design. Screw and turbo blowers are reported to be up to about 35% more efficient than older positive-displacement units, so a Roots blower usually costs more to run in long, continuous aeration. It costs less to buy, which suits small plants and short running hours.
Why does a Roots blower need a relief valve and silencer?
A Roots blower moves air without limiting its own pressure, so a blocked or throttled discharge can overload the motor and damage the unit. A relief valve on the discharge protects it. Air leaves in pulses, which cause noise and pipe vibration, so a silencer is normally fitted.
What maintenance does a Roots blower need?
Check the oil level and condition, timing gears, bearings, belts and the inlet filter on a regular schedule. Watch for rising noise, vibration, temperature or falling airflow. Intervals depend on the model, duty and site conditions, so follow the manual of the exact unit and keep spare filters and oil on hand.
Can Roots blowers be used for fisheries and biofloc in Bangladesh?
Yes, blowers are used to supply oxygen in aquaculture. A Bangladesh Agricultural University trial aerated tilapia ponds with a blower for 9 hours a day to lift oxygen levels, and biofloc systems need constant aeration. Size the blower to pond or tank volume, stocking density and depth, and confirm it with our engineers.
How can I get a quotation for a Roots air blower?
Send your application, tank volume, water depth, required airflow in m³/min and power supply to our engineers by phone or email. We reply with a free quotation for your ETP, WTP, STP or aquaculture project, and we can also advise on diffusers, piping, silencer and a relief valve.
