Fine pre-treatment

Vertical bar screen

Function:

  • Vertical bar screens are intended for the pre-treatment of municipal and other water
  • suitable also for industrial applications

Advantages:

  • screens can be installed wherever there is small and narrow space or sewerage in a large depth
  • highly effective for removal of coarse impurities, especially non-woven as well as the fiber materials
  • screens can be also used to protect pumps in the pumping stations
  • trapping and transportation of screenings
  • insufficient space for installation
  • significant variability of connection types and lenght of screw conveyor
  • fully automatic operation

Variability:

  • standard slot width from 3 mm and more
  • capacity up to 40 l/s
  • the possibility of an integrated press for screenings

circular bar screen - “bug”

Function:

  • the circular bar screen is intended for the pre-treatment of municipal and other water.
  • it removes solid impurities greater than 3 or 6 mm.
  • impurities up to a size of 50 mm are removed.

Advantages:

  • exceptional resistance to clogging due to entrapped fat and other matter
  • small dimensions
  • own emergency by-pass
  • large filtration area
  • protected system of aperture cleaning practically eliminates any clogging

Variability:

  • available in sizes for 10, 20, and 30 l/s flow rates
  • width of gaps between screen bars: 3 or 6 mm
  • heating option – control option using a level sensor

Downloads:

Circular bar screen – “bug”

straight screw screen

Function:

  • entrapment of solid particles (screenings) from water
  • flushing of soft particles
  • dewatering and pressing of screenings

Advantages:

  • simple structure
  • high level of variability
  • no spatial demands
  • fully automated operation
  • low consumption of operating energy

Variability:

  • channel width from 0.3 to 0.6 m
  • fine screen bar spacing: 3 and 6 mm
  • integrated press option
  • screen flushing option

Downloads:

Straight screw screen

vertical screw screen

Function:

  • vertical screw screen are intended for pretreatment of municipal and other waste waters
  • suitable for both small and medium operations

Advantages:

  • trapping and transportation of screenings in the smallest possible installation area
  • great variability of connections
  • integrated emergency overflow
  • integrated press
  • fully automatic operation

Variability:

  • removes solids bigger than 3 mm or 6 mm
  • suitable for pump stations for protection of pumps

Downloads:

Vertical screw screen

drum screw filter

Function:

  • entrapment of objects and undissolved particles in water with a size from 0.1 mm
  • pressing of entrapped particles
  • transport of materials to a container

Advantages:

  • high level of coarse pre-treatment
  • large filtration area
  • filtration using a resistant stainless steel sieve
  • separation, dewatering and pressing within one process

Variability:

  • model series according to inlet parameters
  • the filter can be installed in a channel or a stainless steel tub
  • density of the filtration sieve (0.1 – 3 mm)
  • flushing option for entrapped material
  • possible customization of the hopper according to specific requirements

Downloads:

Drum screw filter

what screen should be used for the wastewater pre-treatment?

The screen to be installed at the inlet of the wastewater plant is expected to perform the basic function, i.e. to separate all solid particles of at least one dimension smaller than the width of screen bar spacing and to ensure the reliability of this function.

No screens for channel widths up to 600 mm are specifically designed to entrap gravel or sand, hair, fibres and textiles. All these undesirable components shorten the screen service life and result in higher demands for servicing.

With respect to the level of the aforesaid influences reflecting the content of harmful matter, the individual screens differ a great deal. There are treatment plants of municipal water that contain a great amount of such substances causing the above problems.

In general, the influent impurities have approximately the same dimensions in both large and small treatment plants, which is disadvantageous for the small ones.

For process reasons, small bar spacing (6 or 3 mm) is required. However, screens with small bar spacing easily become clogged, have a smaller actual flow area, and withstand poorly long-term overloading due to wastewater and amounts of impurities

In practice, two systems are used:

  • with direct inflow of wastewater from the sewer piping to the screen
  • with a pumping sump