The properties of the air-water state diagram, representing the liquid holdups according to gas velocities, in a 0.075 m diameter column are restated. After measurement of the interfacial areas and mass-transfer coefficients, the part of the diagram corresponding to high gas velocities and low liquid contents ( I 0 < Uc < 14 m i s and 0.005 < UL < 0.04 d s ) was chosen for the treatment of polluted gas streams. Under these conditions, it was shown that a "droplet column" is very efficient for the treatment of gases polluted by acid vapors (SO2, HCI) and dust (iron oxide, talc, etc.). The cost of energy appeared more favorable than for classical bubble columns.Les proprietes du diagramme d'etat air-eau, representant les retentions du liquide en fonction des vitcsses de gaz, dans une colonne de 0,075 m de diametre ont ete rappelees. Apres mesure des aires interfaciales et des coefficients de transfert de matiere, le domaine utilisant des hautes vitesses de gaz et de faibles teneurs en liquide (10 < U , < 14 m/s et 0,005 < UL < 0,04 d s ) a ete choisi pour le traitement des effluents gazeux. II est montre que dans ces conditions, la "colonne a gouttes" est tres performante pour traiter des gaz pollues par des vapeurs acides (SO,, HCI) ou des poussieres (oxyde de fer, talc...). Les depenses energetiques apparaissent plus favorables que pour les colonnes classiques.
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