Electrochemical cell with degassing device

An electrochemical cell for electrolytic treatment of an aqueous solution, comprising

• a cell housing tub (8);
• a plurality of plate anode (1) and cathode (2) electrodes, spaced apart from and parallel to one another in said cell, collectively defining an interchangeable electrode stack (3), with adjacent electrodes that have alternating polarity meshing with one another in a comb configuration,
• respective first (6) and second (7) power elements, each serving to provide electrical contact and mechanical retention to all the electrodes having a common polarity, by means of respective power feeders (4,5) of solution-resistant material welded laterally to the electrodes,
• means (26, 27, 14, 37) for circulating a flow of said aqueous solution from bottom to top of the electrodes along their electrode surfaces, and thence to a drain (28) leading to a container (16),
• wherein said cell housing tub (8) has an open top and has at least one sidewall (10, 12) defining a first overflow lip for degassing said solution during flow thereover;
• the cell housing tub is surrounded, at least in the region of the first overflow lip, by a further wall (31) lower than said at least one sidewall (10, 12) and defining a second overflow lip and a collection container or sump (32) between said first overflow lip and said further wall (31), thereby forcing flowing solution to cascade over both said first and second overflow lips and assuring complete degassing;
• a hood (18), extending over both said tub (8) and said first (10, 12) and second (31) overflow lips, contains any gas released during said degassing, and vent means (20, 21) are provided for removal of said gas contained by said hood (18).