PolySave
Siljan PolySave is a computerized control system that monitors the sludge parameters and adjusts the polymer addition rate in a sludge thickening plant.
The system measures the SS-content (Suspended Solids) in the reject water of the sludge thickener, by means of an optical sensor. The Siljan PolySave is thus able to estimate the DS-content (Dry Solids) of the thickened sludge, as there is a proportional relationship between the SS-content of the reject water and the DS-content of the thickened sludge.
A uniform DS-content is maintained in the outgoing sludge, by adjusting the polymer addition rate based on the SS-content of the reject water, which will yield minimal polymer consumption and a low risk of over-dosing the polymer.
The control cabinet will take samples of the SS-content of the reject water at pre-destined intervals. The control system will then adjust the polymer pump to reach the set value of the SS-content of the reject water.
- If the SS-content of the reject water is higher than the set value, the polymer addition rate is increased.
- If the SS-content of the reject water is lower than the set value, the polymer addition rate is decreased
The process regulation is progressive, which means that a large deviation between set SS-content and actual SS-content will yield a powerful regulation of the polymer addition rate. Accordingly, a sudden change of the sludge composition is quickly compensated by the control cabinet.
| Siljan Allards AB, Phone +46(0)248-125
35 Fax +46(0)248-137 85 |
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| E-mail info@siljanallards.com www.siljanallards.com |
PolySave