PROCESS FOR PURIFYING SLUDGE CONTAINING MAINLY WATER

摘要

The invention relates to a method for improving purification of sludge containing mainly water, so that before a mechanical dewatering stage two components are added to the sludge in order to improve its dewatering properties. First a water-containing coagulating mixture is added, which contains a ferric salt and an organic polymer having a molecular weight of under 1 000 000, and then a polyelectrolyte with a molecular weight of above 3 000 000 is added.