| 摘要 |
In a treatment unit for contaminated liquids, in particular industrial effluents, waste gases with a pollutant gas content arise in the treatment chamber. To prevent emission of pollutant gas in a simple and operationally reliable manner, the waste gas is introduced into a circulating gas stream, into which a treatment device (10) for purifying the circulating gas by removal of pollutant gas and a gas circulation device (11) are inserted. The purified circulating gas is recycled to the treatment chamber. By selecting an appropriately high flow rate of the circulating gas stream, the pollutant gas concentration can be diluted even upstream of the treatment device (10) to a value equal to or less than the permissible emission concentration. Particularly in batchwise operation, the circulating gas volume is balanced by an external air connection (16) arranged downstream of the treatment device (10). In the case of batchwise operation, the flow rate of the circulating gas stream is appropriately equal to or greater than the maximum flow rate of the liquid flowing into the treatment chamber, so that backflow is prevented. <IMAGE>
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