Abstract: An aeration and filtration system and process for treating wastewater is described, the system having an ejector able to mix gas and liquid, an oxidation tank able to contain a solution of wastewater and biological sludge, a filtration means, a pipe able to convey the wastewater and biological sludge solution from the oxidation tank to the filtration means. The pipe is connected to the ejector so as to introduce a turbulence inside the pipe; moreover the filtration means is equipped with a membrane which has micropores.

Abstract: A flexible cleaning element for rotating brushes for automatic washing of vehicles, suitable for being attached to a rotating support and made of an expanded closed-cell synthetic resin is provided. The expanded synthetic resin includes a copolymer that is obtained by adding vinyl acetate to it.

Abstract: In a rotating brush (1) which is particularly suitable for motorized systems for the automatic washing of vehicles, comprising a support member (2) that can be connected to a rotating device (3) and to a number of flexible cleaning elements (4) that support one another and are attached at one end (4e) to said support member (2), perpendicular thereto, said flexible cleaning elements (4) are made of an expanded closed-cell synthetic resin.

Abstract: A process for making rotating brush (21), in particular, the type used in automatic car washing facilities, and comprising a support (21s) which has inner face (6) and outer face (7), having attached to the outer face flexible cleaning elements (3n), wherein the process includes the following stages:a) preparation of mold (24) capable of making desired rotating brush (21);b) arrangement of the flexible cleaning elements (3n) with one end inserted into mold (24) and the other end projecting outwardly;c) injection into the mold (24) of components in the fluid state intermixed to form synthetic resin (8) which is able to polymerize;d) opening of mold (24) once polymerization is complete and extraction of brush (21) in which these flexible cleaning elements (3n) are attached to this support (21s) because they are embedded in the polymerized resin.