Sawdust based mixture comprising iron-containing waterworks sludge from drinking water treatment plants

摘要

The method of treatment of iron-containing sludge, mainly from water-treatment plants, consists in the mixing of dewatered and dry sludge with sawdust enriched with an oxidiser, e.g. KNO 3 , at a ratio that will guarantee the total carbon content in the mixture of 40% at least. The formed mixture will be used for the production of pelleted or briquetted fuel while other possible pelleting additives are used. After the burning of the fuel in heating installations of lower capacities ash is mixed with HCl and by filtration of the liquid fraction recycled FeCl 3 is obtained that will be reused as a clarifying salt in water-treatment plants.