The processing of municipal sludge takes place in wastewater treatment plants in several stages. One of the final stages is sludge thickening. VANEX has developed thickening lines specifically for this purpose, aiming primarily at the maximum possible thickening of sludge with the most effective separation of the liquid component – water (with the possibility of its recycling).
- Input dry matter content 0,5 – 1%
- Voltage system: 3 + PEN ~ 50Hz, 400/230V, TN – S,
- Utility water (with a pressure of 5-6 bar), or the option to use filtrate,
- Connection to chemical preparation unit (flocculant delivery),
- Compressed air connection minimum 6 bar,
- Drinking water (flow rate 2-3 m3/hour, pressure approximately 0.3 MPa),
- Appropriate flocculant type (powder, emulsion)
The variability of thickening lines
Sludge at each location, as well as the location itself, has its specifications, so individual VANEX thickening lines are adapted for maximum functionality and efficiency. Various modifications of thickening lines are created based on the components they consist of and, of course, according to customer requirements. The basic component is a belt thickener, to which additional components are added based on the needs. Example of a standard thickening line:
Thickener with chemical preparation unit and with a storage tank
Operation principle: In the chemical system, a flocculant solution is prepared. It is introduced (via a dosing pump) into the dynamic mixer on the belt thickener, where it is mixed with the sludge (supplied by a sludge pump). The mixture (sludge and flocculant) is separated into liquid and thickened components after the thickening process. The thickened component flows into a tank for thickened sludge, which is then pumped out from the tank to a designated location. The storage tank serves as a reservoir for rinsing water for rinsing the belt filter of the thickener.