A wet scrubber for capturing gaseous pollutants and recovering heat from a process gas stream containing water vapor, the wet scrubber comprising: a wet scrubber tower having an inlet arranged at a lower end thereof, and an outlet arranged at an upper end thereof, a scrubbing stage arranged in the interior of the wet scrubber tower bringing the process gas stream entering the wet scrubber tower via the inlet into contact with a scrubbing liquid for capturing at least one gaseous pollutant from the process gas stream, and a condensing stage arranged inside the interior of the wet scrubber tower vertically above the scrubbing stage and comprising a structured packing for bringing the process gas stream into contact with a condensing liquid for condensing at least a portion of a water vapor content of the process gas, wherein the scrubbing stage and the condensing stage comprise a structured packing (22, 36) to bring the process gas stream in contact with the scrubbing liquid and in contact with the condensing liquid, and wherein a liquid distributor is provided, which is suitable to supply the condensing liquid of the condensing stage with a pH of 5 to 9, wherein a liquid distributor is provided, which is suitable to supply the scrubbing liquid of the scrubbing stage with a pH of 0.2 to 3, such that hydrogen chloride and/or mercury (Hg) and/or ammonia (NH 3) can be captured from the process gas stream, and wherein a liquid collector is arranged between the structured packing of the scrubbing stage and the structured packing of the condensing stage for collecting condensing liquid that has passed through the condensing stage, wherein the wet scrubber comprises a circulation pump connected to the liquid collector via a circulation pipe, wherein the circulation pump is arranged to pump condensing liquid from the liquid collector to the liquid distributor, wherein the wet scrubber comprises a source for supply of an alkaline substance to the condensing stage, a drain pipe for draining liquid from the condensing stage and a pH-meter configured to measure the pH of the liquid circulating in the circulation pipe and to control the supply of alkaline substance from the source. a wet scrubber tower having an inlet arranged at a lower end thereof, and an outlet arranged at an upper end thereof, a scrubbing stage arranged in the interior of the wet scrubber tower bringing the process gas stream entering the wet scrubber tower via the inlet into contact with a scrubbing liquid for capturing at least one gaseous pollutant from the process gas stream, and a condensing stage arranged inside the interior of the wet scrubber tower vertically above the scrubbing stage and comprising a structured packing for bringing the process gas stream into contact with a condensing liquid for condensing at least a portion of a water vapor content of the process gas, wherein the scrubbing stage and the condensing stage comprise a structured packing (22, 36) to bring the process gas stream in contact with the scrubbing liquid and in contact with the condensing liquid, and wherein a liquid distributor is provided, which is suitable to supply the condensing liquid of the condensing stage with a pH of 5 to 9, wherein a liquid distributor is provided, which is suitable to supply the scrubbing liquid of the scrubbing stage with a pH of 0.2 to 3, such that hydrogen chloride and/or mercury (Hg) and/or ammonia (NH 3) can be captured from the process gas stream, and wherein a liquid collector is arranged between the structured packing of the scrubbing stage and the structured packing of the condensing stage for collecting condensing liquid that has passed through the condensing stage, wherein the wet scrubber comprises a circulation pump connected to the liquid collector via a circulation pipe, wherein the circulation pump is arranged to pump condensing liquid from the liquid collector to the liquid distributor, wherein the wet scrubber comprises a source for supply of an alkaline substance to the condensing stage, a drain pipe for draining liquid from the condensing stage and a pH-meter configured to measure the pH of the liquid circulating in the circulation pipe and to control the supply of alkaline substance from the source.