Improving the sustainability of granular iron/pumice systems for water treatment
BILARDI ; CALABRO ; CARE ; MORACI ; NOUBACTEP ; NOUBACTEP
Type de document
ARTICLE A COMITE DE LECTURE REPERTORIE DANS BDI (ACL)
Langue
anglais
Auteur
BILARDI ; CALABRO ; CARE ; MORACI ; NOUBACTEP ; NOUBACTEP
Résumé / Abstract
Metallic iron (Fe0) is currently used in subsurface and above-ground water ?ltration systems on a pragmatic basis. Recent theoretical studies have indicated that, to be sustainable, such systems should not contain more than 60% Fe0 (vol/vol). The prediction was already validated in a Fe0 /sand system using methylene blue as an operational tracer. The present work is the ?rst attempt to experimentally verify the new concept using pumice particles. A well-characterized pumice sample is used as operational supporting material and is mixed with 200 g of a granular Fe0 , in volumetric proportions, varying from 0 to 100%. The resulting column systems are characterized (i) by the time dependent evolution of their hydraulic conductivity and (ii) for their ef?ciency for the removal of CuII ,Ni II , and ZnII from a three- contaminants solution (about 0.3 mM of each metal). Test results showed a clear sustainability of the long term hydraulic conductivity with decreasing Fe0 /pumice ratio. In fact, the pure Fe0 system clogged after 17 days, while the 25% Fe0 system could operate for 36 days. The experimental data con?rmed the view that well-designed Fe0 PRBs may be successful at removing both reducible and non-reducible metal species.
Source
Journal of Environmental Management, num. , pp. 133-141 p.
Editeur
ACADEMIC PRESS ; ELSEVIER
