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Czech Republic
Macharova 462
280 00 Kolín

Telephone / Fax:

+420 321 716 021 



Dosing stations and sludge dewatering

KOLÍNSKÉ STROJÍRNY CZ, s.r.o. of Kolín manufactures

  • belt filter presses for continuous dewatering of treated sludge
  • belt filter thickeners for sludge thickening
  • dosing stations for preparing and dosing sludge coagulant solutions

We also provide supply and installation of

Turnkey sludge press equipment technology

  • sludge pumps with regulation
  • spraying pumps
  • compressors
  • dewatered sludge conveyors
  • electric switchboards with automatic control of sludge pressing
  • complete distribution of sludge, water, air and coagulant solutions
  • complete electrical installations, including projects
  • service platforms and other necessary auxiliary structures
  • sludge flow measuring equipment
  • laboratory tests, including determination of coagulant categories and types, their dosage and initial supplies

Mobile dewatering stations

Technology for sanitation of dewatered sludge

The described equipment has a wide range of applications, especially in

  • municipal wastewater treatment plants with a capacity of population equivalents of 3,000 and above;
  • the industry - for dewatering various industrial and processing sludges (e.g. from tanning, food and paper industries, sludge from car wash installations of municipal transportation vehicles, etc.)
  • the agriculture for the slurry dewatering process.


Description of the continuous sludge dewatering line

Belt filter presses allow for the homogenization of the sludge in the tank and, at the same time, achieve higher pre-dewatering rate by turning the processed sludge over in disrupters in the long gravitation zone of the machine. In the next dewatering stage, gradual dewatering of the precipitated sludge takes place by pressing it between two sieves in the wedge zone, followed by final dewatering through dewatering and high-pressure rollers. There are two components separated from the precipitated sludge during the dewatering process - a solid component, referred to as the sludge cake, which is taken to a landfill, used for composting, or additionally sanitized using dry lime powder, and a liquid component, the so-called filtrate, which is consequently processed further. Power output of the belt filter presses ranges between 1 – 30m3/ hour, depending on the sludge type. Achieved dry matter with normal anaerobic digestion sludge is 28-45%; for aerobically stabilized biological sludge - see table.


Sludge annealing loss in dry matter in %  Input flocculant dose g/kg Dry matter of sludge cake in %  
up to 50 3 – 5  26
50 - 60 5 – 7  22
over 60 7 a více  15 - 20


Belt presses are made of bent or rolled "U" profiles in the form of a closed frame, which incorporate all the necessary structural units (drive, regulation, dewatering, high pressure and guide rollers, regulated drive, wiping, channels for draining the filtrate, gravitational zone, sludge tanks, rinsing, air system, electrical installations and filter screens) that are necessary to ensure efficiency of the sludge pressing process. The basic range of machines is manufactured in structural stainless steel AISI 304.

 pásové lisy

Regulation and tensioning pressure of the rollers is provided by compressed air, supplied by the compressor. The filters are cleaned with pressurized industrial water from the effluent treatment plant that goes through the filter to the filter belts sprayers. Power input of the driving mechanisms range from 0.37 to 2.2 kW, based on the capacity of the machine. Control of the driving mechanisms with a variable speed system or frequency converter allows for smooth variation of the sieve belts speed while the machine is running.

Dosing station

Before dewatering, the sludge goes through a treatment using high-molecular organic precipitants (flocculants, polyelectrolytes), solutions of which are prepared in automatic dosing stations (chemicals management system). From there, the prepared solutions are continuously fed by the dosing pump into the sludge piping, where the precipitation of the sludge takes place in a static mixer. The sludge is transported for dewatering to the belt press by a screw pump. A frequency converter controls the incoming volume of the sludge. The entire dewatering line is fully automated and controlled by a program from the technological electrical switchboard, which allows the operator to connect a computer and to communicate with a higher-level control system.

Based on signals from the induction sludge flow meter, the operator can monitor the instantaneous performance of the line.

Any malfunction of the line operation is indicated by an acoustic siren or light signal in the operators’ control room.

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