| 摘要 |
<p>Process and plant for purifying gaseous effluents containing sulphur dioxide and optionally nitrogen oxides. The said process is characterised in that the said gaseous effluents are first of all cooled to a temperature of the order of approximately from 30 to 60 DEG C, then the SO2 and the NOx present in the said effluents are placed in contact (1) at this temperature with a basic solution with which they form, on the one hand, sulphate and sulphite and, on the other hand, nitrite and nitrate respectively, which are subjected during the following stage of the process to the action of appropriate bacteria, namely, respectively, to the action of sulphate-reducing bacteria (3) which reduce the sulphates and the sulphites to hydrogen sulphide (H2S) and of denitrifying bacteria (2) which reduce the nitrites and the nitrates to molecular nitrogen released to the atmosphere without creating harm and/or is reclaimed industrially, whereas the H2S is extracted (4) from the liquid mixture by any appropriate means and then subjected to a chemical oxidation process (7) to produce solid sulphur which is recovered to be reclaimed industrially. <IMAGE></p> |
