STP / ETP Equipment · Submersible Mixer
Submersible Mixer
Mixing & Flow Circulation
Keeps treatment tanks homogenized and prevents sedimentation, producing the low tangential flow with force that nitrification, de-nitrification and phosphorus removal depend on. Compact, lightweight and simple to install — in cast iron or stainless steel, from 2 to 15 HP.
- Motor power
- 2 – 15 HP (1.5 – 11 kW)
- Propeller diameter
- 260 – 790 mm
- Thrust
- 290 – 2900 N
- Protection
- IP68 · S1 duty
What it’s for
Consistent Conditions for Biological Treatment
Biological treatment depends on consistent tank conditions. Left still, solids settle to the floor and the tank stratifies, and the stages that rely on it — nitrification, de-nitrification and phosphorus removal — lose effectiveness. A submersible mixer keeps the whole volume homogenized and in circulation, preventing sedimentation from the start.
The propeller produces a low tangential flow with force rather than a violent stir, so the same mixer suits aeration tanks, equalization tanks and anoxic or anaerobic zones. Used together with an aerator, it lowers energy consumption while maintaining a high aeration rate. The self-cleaning blade stops debris twining around it or blocking it, and the mechanical seal is corrosion-resistant tungsten carbide.
Construction
How It’s Built
Specifications
Technical Data
- PM-260/980-2.0
- 1.5 kW / 2.0 HP · 4 A · 260 mm propeller · 980 rpm · 290 N thrust · 65 kg
- PM-320/740-3.0
- 2.2 kW / 3.0 HP · 5.9 A · 320 mm propeller · 740 rpm · 582 N thrust · 70 kg
- PM-320/960-5.0
- 4 kW / 5.0 HP · 10.3 A · 320 mm propeller · 960 rpm · 609 N thrust · 70 kg
- PM-640/232-7.5
- 5.5 kW / 7.5 HP · 13.5 A · 640 mm propeller · 232 rpm · 1800 N thrust · 230 kg
- PM-640/303-10.0
- 7.5 kW / 10.0 HP · 17.5 A · 640 mm propeller · 303 rpm · 2600 N thrust · 275 kg
- PM-790/303-15.0
- 11 kW / 15.0 HP · 25.4 A · 790 mm propeller · 303 rpm · 2900 N thrust · 200 kg
- PM-620/480-5.0
- 4 kW / 5.0 HP · 14 A · 620 mm propeller · 480 rpm · 1400 N thrust · 230 kg
- PM-620/480-7.5
- 5.5 kW / 7.5 HP · 18.2 A · 620 mm propeller · 480 rpm · 1800 N thrust · 230 kg
- PM-620/480-10.0
- 7.5 kW / 10.0 HP · 27 A · 620 mm propeller · 480 rpm · 2600 N thrust · 275 kg
Cast iron mixers — six models
Stainless steel mixers — three models
- Voltage / phase
- 415 V / 3 ph
- Speed range
- 232 – 980 rpm
- Protection
- IP 68
- Insulation
- Class F
- Duty
- S1 (continuous)
- Medium temperature
- 40 °C maximum
- Cable length
- 10 m
- Blade
- Self-cleaning — prevents debris twining or blocking
- Mechanical seal
- Corrosion-resistant tungsten carbide
- Housing
- Cast iron or stainless steel, by model
- Installation
- Compact and light, with a long lift span — simple to install and maintain
Electrical & duty
Construction
Applications
Where It’s Specified
Keeps aeration and equalization tanks homogenized and free of settled solids. Run alongside an aerator, it lowers energy consumption while holding a high aeration rate.
Creates the circulating flow that nitrification, de-nitrification and phosphorus removal depend on, in anoxic and anaerobic tanks where the contents must keep moving without being aerated.
Holds sludge in suspension and keeps it homogeneous, and drives flow circulation through wastewater treatment basins.
Municipal sewage treatment plants and industrial effluent treatment plants — supplied for new plants, or as an upgrade or replacement within existing treatment infrastructure.
Common questions
Frequently Asked Questions
Which tanks in a treatment plant need a mixer?
Any tank where solids would otherwise settle or the contents need to keep moving: aeration and equalization tanks, anoxic and anaerobic tanks for nitrification, de-nitrification and phosphorus removal, and sludge tanks that need homogenizing.
Cast iron or stainless steel?
Cast iron spans the full range — six models from 2 to 15 HP, on propellers from 260 to 790 mm. Stainless steel comes in three models from 5 to 10 HP, all on a 620 mm propeller at 480 rpm, for effluent where corrosion resistance matters most.
Can it be added to an existing plant?
Yes — mixers are regularly supplied as upgrades or replacements within existing STP and ETP infrastructure, not only for new plant builds.
Is this the same mixer as the biogas agitator?
Yes — the same PM-series mixers, applied here to treatment tanks. For mixing inside an anaerobic digester, see Agitators.