A sand filter dual type could work, that is a filter with 2 layers, one of sand (small size) one of antracite (bigger size) This provide high solids storage capacity and reduce the risk of clogging.
Please give me your recommendation and experience regarding the chemical to be used to dewatering in Press Filter sludge coming from river water purification with coagulation-flocculation plus clarification.
I doubt between polyelectrolyte or lime.
Thanks in advance for your help.