Primary inorganic feedstock material is introduced into the melting region of an SCM melter. The material is heated with a burner to form a turbulent melt matrix. The burner exit is disposed below the top surface of the turbulent melt matrix. A mixture of secondary inorganic material and organic material is introduced into the melting region below the top surface of the turbulent melt mixture. The mixture is heated with the burner to incorporate the secondary inorganic material into the turbulent melt matrix and combust at least some of the organic material to produce heat.