Industrial plant for gas treatment

An industrial plant for gas treatment, comprising a wall assembly and at least a first gas treatment unit received in the wall assembly, the first gas treatment unit comprising a first, a second and a third compartments, each compartment extending vertically between an upper end and a lower end;

• the lower end of the first compartment comprising a gas inlet, the upper end of the second compartment comprising a first gas outlet;
• the first gas treatment unit also comprising a first and a second porous structures, disposed respectively in the first and in the second compartments, the first porous structure being situated higher than the gas inlet, the second porous structure being situated lower than the first gas outlet;
• wherein the first gas treatment unit also comprises:
• a first opening, situated between the first and third compartments, higher than the first porous structure;
• and a second opening, situated between the third and second compartments, lower than the second porous structure.