Acta Scientiarum Polonorum

In recent years there has been a rapid increase in by-products in the purification of waste water treatment – sewage sludge. It is a derivative of Polish civilization development and construction of modern sewage treatment plants. More stringent regulations and established strategic goals wastewater determine the development of modern methods of disposal of sewage sludge: thermal techniques. As a result of such actions amount resulting fly ash from thermal treatment of municipal sewage sludge has been growing significantly. Intensive work on the possibility of environmentally safe development of this type of waste. The article presents the results of technological parameters of hardening slurries with the addition of fly ash from thermal treatment of municipal sewage sludge. As a comparative criterion applicable requirements in relation to slurries applied during the implementation of the cut-off walls in water embankment.