Available technologies When planning new plants or improving old plants, many operators of incineration plants are confronted with the issue of the “correct” choice of a state-of-the-art process taking into account the local conditions. For the separation of acid pollutants, generally three processes are available: Wet flue gas cleaning (wet scrubbing) Semi-wet/semi-dry flue gas cleaning (spray absorption) Dry flue gas cleaning (dry absorption) Depending on the task, these processes can also be used in combination with each other.