Kaspars Bondars

Using Sewage Treatment Plant Sludge for Porous Ceramics Production

The paper discusses the EU directive and the rules for disposing of sewage treatment plant (STP) sludge and storage conditions that have been adopted, it does not fully cover possible use of STP sludge for industrial purposes. One of the ways of reducing amount of sludge is treatment of this waste for further application as additive or raw material for producing building materials. Manufacturing of porous ceramic materials from local raw materials (e.g. clay) using water treatment sludge and sawdust as combustible filler is possible. In order to reduce the sludge humidity, freezing method was used, where sludge give away more loose water in the process of thawing. It was proved during the research that sewage treatment plant sludge can be used to make porous ceramic materials.