Abstract: A mat of a liquid-tight, flexible material is provided for the collection of fluid used to treat objects pulled onto the mat. In particular, the mat is used for the collection of deicing fluid during deicing of an aircraft. The mat comprises at least one discharge opening. The mat includes wires for stiffening the mat in the direction of travel on it. The mat may advantageously be formed with grooves for directing the treatment fluid to at least one discharge opening. For use in connection with large mats composed of mutually parallel webs there is provided a fixture for mutual fastening of the webs and sealing of the joint between the webs.