VX-PAZA THICKENER

Description

Belt thickeners are the plants for continuous thickening of different kinds of sludge.

A free liquid compound – filtrate is released from sludge being thicken during a technological process of thickening which can be further processed.

A recommended layout of VX-PAZA thickener within an overall technological connection scheme.

Condensed sludge is pumped into the plant with a displacement pump. The output of this pump is continuously regulated with a frequency converter.

In most cases it is necessary to add flocculant solution into condensed sludge before its entry into the plant. Sludge flocculates (coagulates into bigger crowds – floccules) and filtrate is being released.

In case of variable volume of sludge that is pumped into the thickener (mainly because of variant dry matter of input sludge), it is necessary to change also the volume of added flocculant solution.

In some cases the thickening process can run without flocculants being used. However, in such a case the parameters of thickening process are aggravated and therefore the quality of discharge filtrate is deteriorated.

The main part of the plant is a polypropylene tank with a cover, which is divided into inflow part, drainage part, filtrate drain part and condensed sludge off-take.

Technological process of dewatering runs in two basic technological zones:

1. homogenisation zone – a part of technological cycle after flocculants added into sludge, in which sludge is being mixed with organic flocculant solution, flocculated and released.
   When no flocculants are being used, this process is being omitted.
    
2. gravity dewatering zone – gravity dewatering of sludge runs in the dewatering part of the thickener on the filtrate sieve. Sludge is drifted in the mentioned zone by the moving sieve, which is driven by the motor with a gearbox.

If it is required to increase output dry matter of sludge at the exit of the thickener, it is possible to use a destroy slat at the end of the thickener gravity zone. The slat destroys the layer of dewatered sludge and therefore the filtrate that was blocked by the upper layer of the cake, can drain.

The filtrate sieve is being cleaned with splashing jets.

For splashing can be used either drain filtrate or cleaned water from the outlet of the wastewater treatment plant (eventually any service water).

The type of the filtrate sieve affects quality of the filtrate and plant output and this is selected according to sludge properties and used flocculants.
Filtrate drains through the filtrate sieve into a drainage part, then into further technology. This is done in most cases gravitationally.

Filtrate can be also pumped automatically if required. The pump can be switched on with the level probes that scan the amount of filtrate in the drainage part of the thickener.

After passing the gravity zone sludge drains into further process (belt press, centrifuge, digestion tower etc.) in most cases gravitationally.

Similarly like filtrate, condensed sludge can be pumped with the pump and this can be operated with the level probes and regulated by the frequency changer.

For the operation of the thickener are required power supply system 3/N/PE AC, 400/230 V, 50 Hz, TN-S, with the demand of power according to the following table.

Parameters

Fotogaléria