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“Small wastewater treatment plants, simple, clean, secure and economic: PUROO®“.

Many years of experience from almost 85,000 small wastewater treatment plants sold worldwide combined with the wishes of many customers have motivated us to enhance our wastewater treatment plants.

We have brought together the best from our proven wastewater treatment plants and have thus developed a very simple and reliable SBR technology. On the basis of our reliable McWater® SBR plant a very simplified version of the proven SBR process has resulted – matched precisely to the conditions of one- or multi-family dwellings.

As with our proven APURIS® plant we have dispensed with fault-prone solenoid valves. For PUROO® we have adopted the patented and secure ball valve from our AQUAmax® BASIC series.

PUROO® is the sum of all ATB innovations from almost 85,000 small wastewater treatment plants; consequently developed and matched to the requirements of our customers.

“Small wastewater treatment plants are too complicated!“

In recent years, small wastewater treatment plants have become increasingly complicated. Many developments in the branch have only taken place because they were possible – not because they are necessary.

A standard SBR small wastewater treatment plant often has up to 4 unreliable solenoid valves or pumps. The control systems have ever more functions and ever more sensors, which can fail or cause malfunctions. Many firms even offer to equip the small wastewater treatment plants with an internet connection in order, in this way, to monitor the function.

The result is that operation, scheduled servicing and repair of the plants have become increasingly complicated in recent years.

With PUROO® ATB has found a solution to make small wastewater treatment plants simple and secure...

The Technology – „This is how the ECOMAX®functions.“

The water flows via the primary settling stage (1) into the SBR tank (2).

The intermittent aeration takes place in the SBR tank, and that so long until the mechanical ball valve (3) float activates the air flow pump (4) due to the higher water level. First, through this activation, the sludge return flow takes place in several short pump strokes.

Now follows the settling. With this, the sludge sinks in the SBR tank.

The air lift pump is activated again and now

transports the treated water out of the plant (7).

A valve (6) integrated into the outlet differentiates between short pump strokes (= excess sludge draw-off) and longer pump operation (= clarified water draw-off).

With minimum water level the air flow is again switched from the air lift pump to the pipe aerator (5). The sequence starts again from new. The cycle is thus not controlled time-dependent but rather water level-dependent.

PUROO®− The characteristics

„ PUROO® is simple.“

  • Only one air lift pump – through this less components have to be installed.
  • Only one air hose – the laying of lines between control unit/blower and the plant has been simplified.
  • No solenoid valve but rather a robust, ATB own developed ball valve float controls the air flow directly without electrical energy – purely physically.
  • Simple operation of the control system as the process has only a few functions.
  • The sampling facility is already integrated.

„ PUROO® is economic.“

PUROO® saves energy. The water is pumped once only. Conventional SBR wastewater plants transport the water twice.

The service life of the blower is high. As the water is transported once only, the blower as a result runs less.

The power consumption per inhabitant and year is approximately 30 kWh/PT pa.

Low maintenance costs as no solenoid valves or pumps have been employed.

Instead of a solenoid valve: this float switches between draw-off of excess sludge and clarified water draw-off.

Even the sampling is clean.

„ PUROO® is clean.“

Whether with severe underloading or with inflow peaks: PUROO® simply adjusts itself to the situation. 

Primary settling stage and SBR chamber are
connected with each other. The greater buffer resulting through this ensures a better treatment performance with fluctuating loading. The retention time of the wastewater is increased significantly.

For satisfactory security and increase in the service life we always employ at least 80 Watt blowers. PUROO® thus always has sufficient performance reserves.

PUROO® safely meets the strict French limiting values for filterable solids (AFS) of less than 30 mg/l. 

The efficiency referred to BOD5 is 97.9 % and referred to COD 95.1 % (testing according to DIN EN 12566-3, PIA, Aachen).


„ PUROO® is secure.“

No fault-prone solenoid valves, no pumps in the wastewater.

PUROO® operates according to the SBR process. For over 12 years this has been the most frequently installed system with small wastewater treatment plants. As PUROO® operates according to the actual wastewater produced; sudden unexpected fluctuations in inflow are also treated securely.

Supplementary to the testing according to DIN EN 12566-3, PUROO® has also gone through additional overload and underload situations on an accredited test facility.

PUROO® is supplied with the proven and technically mature control system on the basis of the APURIS®.

The ball valve float switches between aeration and the transporting of water.