Opportunities for water treatment sludge re-use

Abstract

This paper deals with the sludge that is produced within the treatment of water and production of drinking water. When alumina and iron coagulants are used for coagulation and clarification of surface water, mainly alumina and iron sludge are produced. This paper describes possible alumina recovery in the water treatment procedure and re-use of sludge for treatment of municipal wastewater. The sludge can be also used for production of cement. All those actions decrease the quantity of wastes and contribute to environmental protection. The waste sludge can be also used as secondary raw materials.