Rotary Screens

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The Defender® rotary screens are designed to remove solids transported by the water which must be treated so it can be avoited the obstruction and mechanical problems in the aftercoming equipment. This devices  are self-cleaning, automatic propelled and they  filter the wastewater through a filtration drum made of a grid or perforated mesh with different apertures of 3.0 to 0.15 mm depending on the type and amount of solids. Their installation in wastewater treatment plants of settlements can allow the replacement of primary sedimentation tanks, ensuring the elimination of coarse sands and up to 30% of the fats. The offered equipment is easy to operate due to the fact that the treatment stream enters through a flange located on the outside of the drum and is distributed evenly by an overflow over the drum filter. The solids are retained on the surface of the drum as it rotates and the inflow water pasing the drum in both upper and bottom sides  performs as cleaning function. When passing through the external scraper, the solids are separated from the net and fall off by gravity. The Defender rotary screens are divided into several models depending on the diameter of the filter drum and the flow rate:


HPS model



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Channel screen conveyors

Defender® channel screen conveyors are versatile equipment that is used in the straining, compaction and transportation processes for mechanical sewage treatment. The installation of these facilities prevents various in type and dimension solids from entering the wastewater and prevent causing the sewers, reservoirs and pipelines clog, and protects the rest of the equipment at the plant from overloading, blocking and wear. The lattice structure in form of bent half-pipe is made of stainless steel with perforations from 1 to 10 mm in size. The characteristic design of the equipment is specially designed for its easy installation in cannals, the implementation can be tailored to the specific needs at different angles and can be offered in two versions with and without compacting bathtub. As advantages of the offered equipment can be emphasized its high transport capacity and easy cleaning (brushes mounted on the outside of the screw keep the grille constantly clean). In the presence of a sealing bathtub for the grid cleaning system are provided water jets. The installed screws are resistant to friction due to the reinforced inner surface of the conveyor tube.

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Compact pre-treatment plant

The Defender® compact pre-treatment plant is a complex equipment that allows the implementation of several processes simultaneously: straining, removal of sand and grease. These facilities include a channel screen conveyors or compacting auger, 2 pcs. screw conveyor (longitudinal and inclined), sand and grease removal bath-tub and scraper system. Once the solids have been filtered, compacted and removed, the equipment is equipped with a fine aeration system located at the bottom of the bathtub, which allows the fat to rise to the surface. The grease is then removed by a scraper trapping system located at the end of the sand and grease removal bath-tub, which transports it to the edge of it from where it is gravitationally extracted by pipe.

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Anaconda® flotators are highly efficient (up to 99%) systems for physico-chemical removal of undissolved substances from wastewater. The purification of pollutants here takes place through a combination of several processes: coagulation, by adding the appropriate chemicals are formed the so-called "flocs" (aggregated parts of pollution), flotation in which, under the influence of dissolved air the already formed flocs "float" which leads to their removal from the surface scraper and precipitation of larger and heavier particles, which are subsequently removed from the bottom assisted by a lamellar system. The operation of the offered equipment is fully automated and easy to control through a PLC control module equipped with a touch screen, in addition to which it is equipped with emergency shutdown and security systems, pneumatic control circuit and air injection.

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