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Water Practice & Technology © IWA Publishing 2007 |
doi10.2166/wpt.2007.019
Sewage sludge as a precursor of adsorbents/catalysts for environmental applications
A. Ros1, C. Canals-Batlle1, M.A. Lillo-Ródenas2, E. Fuente3, M. A. Montes-Morán3, M.J. Martin1, A. Linares-Solano2
1Laboratori d’Enginyeria Química i Ambiental, Departament d’Enginyeria Química, Agrària i Tecnología Agroalimentaria, Facultat de Ciències, Universitat de Girona, E-17071 Girona, Spain
2Grupo de Materiales Carbonosos y Medioambiente (MCMA). Departamento de Química Inorgánica, Universidad de Alicante, Apartado 99, E-03080 Alicante, Spain
3Instituto Nacional del Carbón, CSIC, Francisco Pintado Fe, 26, E-33011 Oviedo, Spain
ABSTRACT
This paper focuses on the valorisation of solid residues obtained from the thermal treatment of sewage sludge. In particular, sewage sludge samples were collected from two waste water treatment plants (WWTPs) with different sludge line basic operations. After drying, sludges were heated up to 700 ºC in appropriate ovens under diluted air (gasification) and inert (pyrolysis) atmospheres. The solids obtained, as well as the dried (raw) sludges, were characterised to determine their textural properties and chemical composition, including the speciation of their inorganic fraction. All the materials under study were employed as adsorbents/catalysts in H2S removal experiments at room temperature. It was found that, depending on the particular sludge characteristics, outstanding results can be achieved both in terms of retention capacities and selectivity. Some of the solids outperform commercially available sorbents specially designed for gaseous emissions control. In these adsorbents/catalysts, H2S is selectively oxidised to elemental sulphur most likely due to the presence of inorganic, catalytically active species. The role of the carbon-enriched part on these solids is also remarked.
Keywords: Adsorption; catalysis; gasification; pyrolysis; sewage sludge
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