1. Device (10) for treatment of a liquid (12) with a non-thermal atmospheric pressure plasma, wherein the device (10) comprises the following components:

– a high-voltage electrode (20);

– a liquid-permeable ground electrode device (30) comprising an areal, conductive region (32) and a porous region (34) arranged at the areal, conductive region (32);

– a discharge space (40) formed between the ground electrode device (30) and the high-voltage electrode (20);

– a first dielectric (50) which is arranged at the high-voltage electrode (20) such that a plasma can be generated in the discharge space (40) by means of a dielectric-barrier discharge;

– a flow volume (60) comprised by a wall (62) into which the liquid (12) can be fed;
wherein
the wall (62) of the flow volume (60) comprises at least in a first region the ground electrode device (30), such that the flow volume (60) is connected liquid-permeably to the discharge space (40) via the ground electrode device (30);
wherein the device (10) is formed such that, in use, the liquid fed into the flow volume (60) passes through the ground electrode device and pours onto a surface of the ground electrode device (30) that faces the discharge space (40), so that a liquid film is formed on said surface;
characterized in that
the conductive region (32) of the ground electrode device is liquid-permeable along its areal expansion.

2. Device (10) according to claim 1, characterized in that the areal, conductive region (32) of the ground electrode device (30) comprises a plurality of recesses that adjoin the porous region (34).

3. Device (10) according to one of the claims 1 to 2, characterized in that the areal, conductive region (32) of the ground electrode device (30) comprises a perforated, or a grid-like, or a textile structure, or a porous structure.

4. Device (10) according to one of the claims 1 to 3, characterized in that the areal, conductive region (32) of the ground electrode device (30) comprises an electrically conductive textile (39) or consists of an electrically conductive textile (39).

5. Device (10) according to one of the claims 1 to 4, characterized in that the areal, conductive region (32) of the ground electrode device (30) comprises a conductive gauze (38) or consists of the gauze.