SLUDGE THICKENER - Operation Manual - Stone Food Machinery

Mariestad 20061109
Level Controls for Sludge Water
A level meter is placed in a pipe in the incoming sludge water and set at a level about 25 cm.
The Exact level has to be adjusted, from experience, later. The level meter is used to interlock
the sludge water pump to ensure the reject/waste water quality remains optimal in terms of
Suspended Solids.
As the pump is interlocked, the screen will continue to lift up the sludge and the pump will
start when the right water level has been reached.
Frequency Inverter
The SLUDGE THICKENER is controlled by a Frequency Inverter with the ability to adjust
the screen speed and therefore the Sludge Solids.
Regulation of Dry Solids content
• The variation of the Screen`s speed is used to adjust the content of dry solids in the
thickened sludge.
• High volumes of incoming sludge water and high speed gives a LOWER content of
dry solids.
• LOWER volumes of sludge water and LOW Screen speed gives a HIGHER content of
solids.
• The same polymer dosing can be used.
• The regulation can also be done by advance knowledge of the solid contents and the
quality of the incoming sludge water. Less solids gives a higher frequency and a
higher speed and vice versa.
Operation time
Operation time depends on the load on the screen, the amount of suspended solids in the
incoming sludge water and desired content of solids in the final thickened sludge. Effective
use is reached with an even covering of flocculated sludge over the entire screen surface.
Polymer
The polymer dose is best set by eye. Clear water should be seen between the sludge flocs. If
the polymer is added before the sludge pump there is enough flocculation in the pump and the
Annika Kjellkvist
Vatten och Miljöteknik 80 p
KY-utb. Hallsberg
2
D:\EQUIPMENT-SUPPLIERS\Swedish\MEVA\BROCHURES\SLUDGE THICKENER\MANUAL\1-9-07-
Operation Manual MST15.doc