Hello, Sludge rheology is ...
Published by Michael Martin, Deputy Asset & Technical DIrector at SUEZ International
Hello,
Sludge rheology is very complex and usually not used as a theoritical point of view for sludge dewatering operation optimization.
The best is to conduct on site trials with a floculation test (different polymers @ different quantity) to assess the floculation and the floc resistance. According to the trials, the best poly @ best quantity will be chosen.
The trials results will be different if you assess biological / primary / mixed sludge.
Following that, you can optimize the poly quantity at full scale level when using your dewatering device, especially with centrifuges with which you can play with the torque and liquid ring level.
At full scale level, the polymer preparation, injection point and injection concentration is also very important.
A first ratio that can be used to benchmark the results is : 8 to 10 kg of active matter of polymer per ton of dry solids treated.
Regards