Waste Water Treatment Plants

High purification capacity
The ROTO waste water treatment plant operates safely and reliably, without unpleasant smell and noise. Moreover, they are not sensitive to temperature fluctuations in the environment. Waste water from toilets, bathrooms, kitchens and similar households sources of pollution are purified to such extent that water can be safley released to surface waters, or can be used for watering of lawns and trees with additional treatment. Waste water treatment plants are constructed in accordance with standard SIST EN 12566-3 which is valid in EU (BOD 5).

Low operation costs
High level of economic and energy efficiency.

Reliability and trust
Over 20.000 waste water treatment plants, oil separators, septic tanks and rain water tanks are installed in more than 50 countries around the world. ROTO is a pioneer in the field of waste water treatment production in Europe. Company also recevied ZRMK Building and Civil Engineering Institute’s award, which is selected by experts in civil engineering, which proves product’s excellence.

Container sized
Completed waste water treatment plant can be delevered in containers. In 40 ft container we can fit 50.000 L tank.

EU products
Waste water treatment plants are manufactured and cetificated in EU countries.

Size of the waste water treatment plant

Determining the size of the waste water treatment plant

  • The size of the waste water treatment plant is determined by population units (PU) or equivalent users, while at the same time defining the biochemical capacity of the treatment plant.
  • The PU unit signifies the specific consumption of water ranging from 0.15 to 0.20 m3/person/day and the biochemical load of 0.06 kg BNO5/person/day.
  • Working volume which is necessary to purify the waste water is from 500 to 800 liters per person.

Plug and play
Ready to use product, easy and quick installation in few days.
Suitable for remote installation without infrastructure.

Underground installation
All our waste water plants are designed for underground
installation. This way they do not use space above ground level.

Modular building
Possibility to add capacity and to move plant to another location.

Tank is made FROM polyethylene
Polyethylene can be 100 % recycled, has good mechanical
resistance. Tanks are produced in one part and are 100% watertight.

Excellent service and technical support
Quick supply, maintenance, start-up and servicing performed by expert staff. Servicing by the ROTO company comprises the checking of mechanical parts in a plant, general cleaning services and operating situation control, as well as the testing of all functions performed by individual plant parts. The user is instructed about maintenance and the correct use of treatment plant. We can also organise or supervise the installation of plant.

ROTO waste water treatment plant is the right decision!


  • 3-person = 1 PU


  • 2-person = 1 PU


  • with kitchen – 2-person = 1 PU
  • without kitchen – 3-person = 1 PU
  • garden terrace – 10-person = 1 PU (without kitchen)

Information is important in the design, structure, calculation of PU AND OF COURSE THE PURCHASE.

Waste water treatment plant EcoBox
Waste water treatment plant EcoBlue
Waste water treatment plant RoClean 4-20PU
Waste water treatment plant RoClean 30-400PU
Waste water treatment plant RoClean 500-2000PU

Purification technologies


Process is managed by computer which is installed into the special box. Softwear is stearing 4 magnetic valves. Each valve has specific function:

  • Pumping water from mud collector to the aerator.
  • Aeration in aeration chamber.
  • Pumping of purified water from aeration chamber to  the outflow.
  • Pumping sediment mud from aerator chamber back  to the mud collector.
  1. Waste water flows into the treatment plant and is  collected in the first chamber-mud collector. Retention time is needed for mud to settles down.
  2. First valve is activated for pumping of waste water from mud collector to aeration chamber.
  3. In aeration chamber air supply is conducted through compressor and air membrane on the bottom of the  chamber. Computer regulates intervals and quantities of air through magnetic valve. Aeration cycles are determined by the size of waste water treatment plant.
  4. After aeration, sedimentation phase begins. In this process purified water is is separated from the sediment. Compressor is turned off in this phase.
  5. Purified water is pumped out from aeration chamber with compressor.
  6. Sediment in aeration chamber is pumped back to mud collector. Entire process is repeated several times a day.


The sediment-selective chamber (the SS chamber)

is a flow chamber of the waste water treatment plant, into which flow the household discharges that will be biodegraded. The discharges, mixed with active mud, move through the opening at the bottom into the aeration-activation chamber.

Into the aeration-activation chamber (the AA chamber), air is supplied by means of a ventilating fan and is lifted in small bubbles through aerators installed at the bottom of the device to the surface. The AA chamber enables the biological process of water purification with bacteria and air. The bacteria have enough oxygen and feed on waste supplied from the SS chamber.

Separation chamber (the S chamber): A mixture of mud comes from the AA chamber to the separation chamber, where the separation of the purified water from active bacteria takes place. The active bacteria sink to the bottom of the S chamber, from where they are pumped to the beginning of the process, while the purified water flows out into nature. The mud mixture, which can also be used as fertilizer, must be pumped out twice a year. We provide expert assistance in treatment plant maintenance.


Eco Blue waste water treatment plant for residential buildings with no regular inflow.
Black and grey water (waste water) is collected in sedimentitation chamber, where it settles. Volume of this chamber is bigger than in conventional SBR systems. After certain time in sedimentation chamber, waste water flows in to aeration chamber with biofilm carriers.

In second chamber two diffusors are installed for aeration. They are connected with compressor and steering unit, which regulates air suply in intervals. Pressure gauge detects defects in system (clogging). Biofilm carriers offers habitat for bacteria to live and reproduce, which results in better efficency of cleaning and longer live span of bacteria.

Subsequent sedimentation is more efficient due to conical sedimentation tank in third chamber. Clean water flows out at top of third chamber through outlet pipe and sediment is returned to first chamber (pre-cleaning) by steering unit and compressor.

UK Contact

Daniel Smithers
Phone: +44 (0) 7880 603010
E-mail: sales@roto-group.co.uk
Skype: danny.smithers1


Roto Group
Puconci 12, Puconci
9201 Puconci

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