| 摘要 |
In a process to treat industrial waste water bearing an organic load, the water is first discharged into a reactor into which is then added a quantity of dry powder adsorbent material, followed by the removal of thin sludge residues. The adsorbent is stratified aluminium silicate in which the Al+++ is replaced at least partly by similar-sized cations e.g. Fe++, Fe+++, Mg++, Ca++, K+ or Na+. The adsorbent incorporates minerals from the Kaolin, Betonite, Illite, Smectite and Chlorite groups occurring together mostly as a mixture, and having replacement capacity and binding characteristics. The adsorption capacity and ion exchange capacity increases from Kaolin to Smectite. Iron Chloride (FeCL3) is also introduced prior to or together with the dry powder adsorbent, lowering the pH to a preferred value of between 4 and 4.5. Either prior to or with the introduction of the absorbent, a neutraliser esp. caustic soda is also introduced to raise the pH to a value of pref. 7. The quantity of dry powder adsorbent introduced is 10 to 850 ppm, pref. 80 to 300 ppm, and is determined by the effluent water quality. The resulting mixture is stirred for 60 to 120 minutes. The thin sludge is removed af ter a further interval of 45 to 120 minutes. The reactor volume is between 20 m3 and 100 m3. |
