Membrane contactors for textile wastewater ozonation.
This paper deals with the application of a membrane contactor for the ozone treatment of textile wastewater. Ceramic (alpha-Al(2)O(3)) membranes were chosen because of their ozone resistance. A thin metal oxide (TiO(2) and gamma-Al(2)O(3)) layer was deposited on the membrane surface to eliminate large defects. Membranes were characterized by bubble pressure and gas permeability tests. Mass transfer coefficients were calculated by using the double-film theory. Decolorization kinetics were studied with model dye solutions. Decolorization experiments with a real exhausted dyebath (untreated and after biological treatment) were also carried out. The potential advantages of membrane contactors for the treatment of these types of effluents are demonstrated.
Ciardelli
Gianluca
G
Tecnotessile S.r.l., via del Gelso 13, Prato, Italy. chemtech@tecnotex.it
Ciabatti
Ingrid
I
Ranieri
Laura
L
Capannelli
Gustavo
G
Bottino
Aldo
A