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Kolo Vesi

Kolo Vesi – a perfect wastewater treatment system

Most buyers want one thing from the wastewater treatment plants. It is the wastewater cleaning system. The output of the cleaning system must be pure water without color and odor. Most sewer systems can do this.

But besides this, we have additional requirements for cleaning systems:

  1. The construction of the treatment plant must be strong enough to withstand any pressure, even under the heavy soils.
  2. No special installation requirements should be – just put it and store in the pit.
  3. Wastewater treatment plants can’t be blocked, overflowed or flooded.
  4. The user does not need to have a deal with the WWTP’s worker more than once per year.
  5. The service should be convenient and simple.
  6. Repair parts do not need to be ordered – they should be available in the nearest shop with an assortment in the field of construction and household goods.
  7. Seldom service and low operating costs.

We offer you a system of deep biomechanical wastewater treatment Kolo Vesi, which fully meets our requirements. And even more.

Description of the cleaning process of the Kolo Vesi system

The main features of the Kolo Vesi WWTP system are strength and waterproofness.

To increase strength, the corps has a cylindrical shape, and due to its circular cross-section, the ground and groundwater pressure is evenly distributed.

Cross-shaped partitions inside the work chamber not only divided into technological compartments, but also they serve as reinforcement of the ribs, they fix the corps. In addition, the partitions are reinforced with a polypropylene beam of rectangular cross-section.

The most important longitudinal joint of the corps is made by a special automatic device for welding plastics. The strength of such a compound practically does not differ from the original force of the material.

External welded seams on the corps are made by extrusion welding – the integrity of the treatment plant depends on these compounds. Kolomaki uses the last generation of extruders for this purpose.

All parts of the treatment plant are cut on CNC machines with programmed control.

The body of the wastewater treatment plant Vesi is divided into 5 chambers: 4 chambers on the underside of the system and one removable chamber in the throat. The drains circulate in a deep Vesi Series cleaning system in series – and repeatedly pass through different chambers of the system.

The sewer enters the first chamber of the treatment plant with a pre-prepared entry. The water inlet and outlet ports, including the water pump, are installed directly from the product.

The first chamber of Kolo Vesi WWTP performs partial mechanical cleaning. There are large fractions of organic inclusions and insoluble impurities – hygienic needs, cigarettes and the like. The process of biological purification begins in anaerobic conditions, carbohydrates and fats are partially destroyed.

In the first chamber, the cleaning will be eliminated by depositing of less dirt, and thus, essentially will complete the first phase (anaerobic processes). After this, partially cleaned wastewater overflows into the second chamber.

In the second chamber, there is a cassette of tubular lamellar biofilters. Biofilm – a set of microorganisms colonies, grows on the outer and inner surfaces of biofilters. The use of biofilms in sewage treatment makes the station works more stable. In addition to biofilm, active sludge, which is predominantly concentrated in the 2nd and 3rd chambers, plays an important role in wastewater treatment.

When flowing into the third chamber of the treatment plant, the water is practically free of suspended substances. Part of the organic compounds, which are processed here, falls into the dissolved form. In the third chamber, the wastewater saturates itself with oxygen from the ambient air, and almost complete oxidation of complex organic compounds, proteins, and fats is carried out. Intensive biological treatment is provided by flocs of activated sludge and biofilm formed on the walls of tubular lamellar biofilters. The biofilter structure in the third chamber is similar to the biofilter in the second chamber of the system.

For the saturation of water with oxygen, a simple and reliable mechanism is used – the water is supplied by a pump to a special filling of the removable vented biofilter, located in the sewer’s throat.

3D model

Biofilter design and water distribution system – is the pride of Kolomaki Company

Biological filter system for deep wastewater treatment Kolo Vesi is easily removed and installed back. The water distribution system is stationary, evenly distributes water to the biological load and cannot be clogged at the same time.

Water passes through the biofilter several times, and thus, the oxygen dissolves in the water.

The third chamber alternates aerobic and anaerobic processes due to the regular pump operation. This makes it possible to achieve complete biological processing of organic compounds.

Virtually cleaned water enters the fourth chamber of Kolo Vesi. In this chamber, the final processes are carried out under anaerobic conditions and the final sedimentation of the slurry. Cleaned water can run naturally or through a submersible pump.

An important feature of Kolo Vesi WWTP is that organic material accumulates in the first chambers of the system. This, on the one hand, allows for a higher degree of water purification (up to 98% or more) and, on the other hand, supports the activated sludge, that works in the system even during the period when the treatment plant is not in operation. Constant delivery of small amounts of organic material to the second and third chambers of the system is ensured by the circulation of wastewater. During the aeration cycle, part of the water, supplied by the pump to the aerator, returns to the receiving chamber of the treatment plant. The dilution of the contents of the chamber is sent to the following parts of the system.

Long breaks in operation do not adversely affect the productivity and efficiency of Kolo Vesi WWTP, because the activated sludge and biofilm are a source of nutrients even when no wastewater is supplied from the house.

Important Features

Wide experience with the operation of various branding devices has revealed the weakest side of WWTPs: in case of abnormal situations, stations are overloaded and electrical equipment is damaged due to water leakage.

The Kolo Vesi WWTP system is protected from such problems – instead of costly and vulnerable blowers, simple and reliable submersible pumps, which aren’t afraid of water, are used. The control unit moves from the frame and is placed on a special tripod above the ground.

The common problem of different WWTP brands is material instability, when emptied during maintenance or when the device is lifted during spring floods.

Veso Vesi systems are reliably insured against weather conditions thanks to 4 anchors, which are located at the base of the treatment plant and with which a strong attachment is achieved.


Kolo Vesi systems, which are designed for 3, 5, 8, 10, 15 and 20 users, are commercially available. A system for 5 users is also available in a closed container – this is suitable for installation in areas with high groundwater levels.

Each Biological Waste Water Treatment Plant Kolo Vesi can be modernized with a pump for pumping clean water.

Depending on the location of the WWTP, it is possible to buy extensions (Midi and Long).

Maintenance of the Veso Vesi WWTP systems

Simple and seldom maintenance of Kolo Vesi WWTP is one of the main advantages of these products from Kolomaki.

The fixed sediment export period is 2 times a year. In addition, you can visually inspect the removal of this solid sediment.

Even if repair is needed, there is no need for expert workers. All components are sold in the nearest store of building materials and home/garden goods.

The aerator and biofilter are maintenance free, made of polymeric materials and do not require replacement.


The installation of Kolomaki wastewater treatment plants is simple, as there is no need for special installation of some elements. Kolomaki WWTPs are supplied complete.

It is enough to prepare a pit of sufficient size, align the bottom and settle the corps of the sewage treatment plant. Finally, pour water into the plant to stabilize it, and then fill the cavities between the WWTP and ground with dry concrete (a mixture of sand and cement).