The chemical preparation plant VX-CHH-DA is designed for fully automatic or manual preparation, storage and dosing of solutions prepared from powdery substances and from emulsions with the possibility of continuous remote regulation of the quantity of the dose.
The primary use is the preparation of flocculation medium solutions – substances that are intended mainly for the flocculation of various kinds of sludge before their processing in the belt presses, thickeners or other machines of the waste water treatment plants.

The following media are necessary for the operation of a unit for chemical preparation:

clean pressure water (flow rate 2–3 m3/h, pressure circa 0,3 MPa),

power supply 3/N/PE/AC 400/230 V 50 Hz TN-S, input power 2,42 - 3,52 kW,
a suitable type of powdery flocculation medium.



This plant mixes solution works in a fully automatic or manual cycle and it is controlled from an independent distributor (E), which is the part of this plant.

After commissioning, the equipment shuts the outlet YV2 and fills the solution tank (K) with clean water (F) through a solenoid valve YV1.

The filling speed can be regulated by a slide valve (C1).
When the propeller stirrer (I) becomes immersed in the solution tank, the feeder of powdery flocculants automatically starts to dose powdery flocculants and wet flocculants fall into the solution tank.
The concentration of solution can be regulated either by setting of time of dosing powdery flocculants or emulsion.
The solution is homogenised with a propeller stirrer in the solution tank.
The time of homogenisation can be set according to requirements of flocculants producers.
The valve YV2 opens automatically after the solution matures, flowing over into the bottom storage tank. The set of dip-electrodes ensures that there is enough capacity for the volume of water from the upper tank and the bottom tank does not overflow.
The solution is drawn from the storage tank (L) by a pump (H) with the possibility of continuously changing the dosing quantity during the operation of the plant by frequency converter (J), a scaled potentiometer. 
The ratio of dilution can be watched on built-in rotameters (P) and regulated with slide valve (C2) and by the revolutions of the motor of a dosing pump.

Mixing of the flocculants solution and diluting water is accomplished in the mixer (N).

The back flaps (M) prevent unwanted dilution of the solution or possible water source pollution.
The slide valve C3 is used for the discharge of solution which is not effective anymore.

Units for chemicals preparation can be produced also as special versions; eventually they can be fully adapted for special customer’s requirements.
Special versions (eventually their combinations) are:

VX – CHHSXX –  DA, vertical unit for chemicals preparation consists of two polypropylene tanks with the dissolving tank situated on the storage tank. This version of unit for chemicals preparation requires an operating platform for feeding powdery flocculant supplies into the storage bin.
VX-CHHXXX-DAP, where "P" means memory which after power supply failure automatically ensures the cycle continuation from the moment of the failure,
VX-CHHXXX-DAT, the plant for preparation of liquid concentrated flocculation media solutions (eventually the other special solutions),
VX-CHHXXX-2DA, the plants with two, eventually more solution dosing pumps controlled separately,
the plants with enlarged tank capacity.



implementation of its own distributor considerably reduces the cost
of electrical installation of the plant,
a continuous remote control of the pump output during the operation and automatic preparation of flocculants solution enables the optimal setting of a dose of flocculants (savings flocculants) and simplifies overall line operation,
the outlet of the dosing pump can also be regulated by electric current 4–20 mA (a possible control of the pump output by the superior control system),
a possibility of displaying the pumped amount of solution on the control panel screen or on the PC-screen.
VX – CHHXXX – DAT, unit for preparation of liquid concentrated flocculation media,
VX – CHHXXX – DAP, letter „P“ means memory that after power supply failure automatically ensures the cycle continuance from the moment of the failure,
VX – CHHXXX – 2DA, units with two, eventually with more separately controlled dosing pumps for the solution,



Unit for chemicals preparation VX–CHH3LX–DA is a three-chamber compact unit for fully automatic preparation and dosage of solutions prepared from powdery or emulsion flocculants. The standard unit consists from a polypropylene tank with total active capacity of 1,7 m3 that is divided into 3 sections.
The first two sections are equipped with mixers which are designed for primal mixing and for maturing of the solution.
The third section serves as a store section.
With decreasing the rate of flow to zero the screw feeder stops feeding too. After the flow is renewed unit continues preparing solution of the set up concentration. This system ensures the constant concentration even in significant deviations in the flow of the thinning water. The thinning water and screw feeder are automatically disconnected through capacity sensor placed in the supply tank of the powder screw feeder. After refilling the powdery flocculant, unit continues in solution preparation.




  VX – CHH – BENTONITE is a  fully automatic compact unit designed for blunging and aging (maturation) of powder bentonite and for its dosing into the technological process.
  The capacity of a standard unit is minimally 2000 l/hour of a 3% product, the total dimensions of the unit are l x w x h: 3000 x 1350 x 1800 mm.
  Blunging and aging of the powder bentonite  is realized in three sections.
  After the decrease of the water level in the third section, the first section is automatically refilled with water and after this refilling the high-speed mixer and the screw-dosing-unit for the powder bentonite are switched on.
  The first section serves for an intensive and perfect mixing of the powder bentonite with water.
  The perfect mixing of a 3% product without occurrence of visible agglomerates is achieved thanks to the small volume of the mixing tank (250 l) and thanks to the high-speed mixer (2 800 rev/min, 3 kW) in the time of circa 30 seconds.
  After one minute of mixing the bentonite is automatically pumped into the second aging (maturation) section. 
  The solution is pushed up into the third storage section via system of communicating vessels and from there it is dosed into the technological process.
  After the whole BIG-BAG is used the process will be stopped and the unit sends a signal for BIG-BAG replacement.
  After the replacement of the BIG-BAG the preparation process is automatically renewed, the prescribed concentration is retained.

Unit´s advantages

  Compactness: our unit creates a compact whole that includes the distributor, dosing pump and the inductive measure for dosing amount.
  Simple installation: after putting the unit on the floor and after power and water connection as awell as after the installation of output pipes for the dosing pump, the unit is prepared for the continuous operation. Our unit does not require any operating platform. The input opening for the BIG-BAG is in the height of 1 300 mm from the floor.
  High corrosion resistance: the used materials are PP, PVC and stainless steel.
  Simple operation: The required concentration is set up by a button and it is displayed on the display of the control panel. After setting up the concentration our unit can be switched into the automatic operation with one button. 
  For service purposes every electric component can be switched on with a separate switch.
  Extensibility: this unit can be extented with additional dosing pumps..
  To increase the capacity the second and the third section can be enlargend according to required performance.




Assumed concentration, %



Approximate mixing output, m3/h-1