Plasma Treatment of Sewage Sludge

This paper describes a method for plasma processing of ash obtained after the incineration of sewage sludge, based on the complete melting of the ash followed by its rapid cooling. The chemical composition of the vitrified slag formed as a result of plasma treatment is analyzed. It is noted that leaching with preliminary activation by grinding substantially decreases the concentration of metal oxides in the slag, which is an effective way to protect the environment.