| 摘要 |
<p><PICT:1007118/C4-C5/1> A process for treating effluent liquor from coal carbonizing plant comprises removing at least the major part of the free ammonia from the liquor, e.g. in a still 4, adding lime to the liquor at a point 16 external to any ammonia still to convert fixed ammonia salts to free ammonia and calcium salts, separating solids from the limed effluent, e.g. in a settling tank 19, and distilling the effluent to remove the ammonia (at 22). Crude liquor is introduced at 1, preheated at 2 by liquor leaving the still 4, and subjected to biochemical oxidation in a sludge tank or tanks 8. A pump 11 delivers the liquor, via a filter 14 if desired, after further heating at 13, to tanks 16, 17 where liming and agitating take place, and 19, where a lime slurry is removed, before delivery to the still 22. Vapours from the still 22 may be sent to the still 4 to carry out the first distillation, if desired with vapours from tanks 17, 19, 20. Three examples are described.</p> |
