改性高岭土对印染废水处理的研究

Study on treatment of dyeing wastewater by modified kaolin

印染废水具有污染物浓度高、种类多、含有毒有害成分、COD含量高以及色度高等特点.实验采用无机絮凝剂硫酸亚铁制备改性高岭土,研究其改性过后对印染废水的处理效果.通过硫酸亚铁-高岭土相混合后的不同配比、不同投加量、pH值、反应温度和反应时间等因素来探究对印染废水的最佳处理效果.研究结果表明:稀释20倍后的印染废水的COD为64、pH为7.30.改性过后在配比为1∶7、投加量为2.5g、pH为6.92、反应温度为20℃、反应时间为20min的条件下,比较发现色度的去除率高达98.3%、COD的去除率高达68.75%,说明该方法对印染废水的处理效果较好.

Dyeing wastewater has the features of high contamination concentration, multiplicity, poisonous and injurious,high COD,high color,etc. We prepare modified kaolin by inorganic floc-culants ferrous sulfate, and study the effect of modification influent conditions on dyeing wastewater. The paper studies the effects of different proportions of Ferrous sulfate and kaolin, different dosage,pH,reaetion temperature and reaction time on the treatment of dyeing wasteu-water. When the printing and dyeing waster water is diluted 20 times, its COD is 64 and pH is 7.30. Treating with 2.5g Ferrous sulfatekaolin（1 ： 7）（pH=6. 92） for 20min at 20℃ will re-move 98.3% chromas and 68.75% COD,which suggests that this method is better than before.