Rice Husk Ash Based Composites, Obtained by Toxic Fly Ash Inertization, and their Applications as Adsorbents

Rice husk ash (RHA) was recently employed as stabilizer, for municipal solid waste incineration (MSWI) fly ash. Indeed, this ash contains large amount of heavy metals, as Pb and Zn. MSWI fly ash contains also soluble salts (mainly NaCl) in 10-20% mass amount. These salts can be recovered after inertization procedure, by material washing. RHA, that is combined with other by product materials, as flue gas desulfurizing residues and coal fly ash, shows good capability in heavy metals inertization, and the technology transfer was financed by EU Commission, in the frame of LIFE+ project (LIFE11 ENV/IT/000256). The obtained composites are characterized by using chemical and structural techniques. In this work first results about the employ of the obtained composites in the field of absorption of Methylene Blue are reported and discussed.