吸附法处理对苯二甲酸精制单元的废水

生产精对苯二甲酸(PTA)时,往往产生大量废水.在初步筛选实验条件的基础上,选择颗粒活性炭(GAC)作为吸附剂处理经过预处理的PTA精制废水.考察了接触时间、pH、GAC用量等因素对废水中有机污染物去除效果的影响.结果表明,吸附平衡时间为2 h,pH在3.0左右对吸附较为有利,吸附等温线符合Frendlich型,GAC的动态吸附容量为63.46 mg/g,可以用20%的NaOH溶液对GAC进行再生,浸泡5 h后的再生率接近90%.

Treatment of PTA wastewater from the purifing unit by adsorption on activated carbon

Adsorption of PTA wastewater from the purifing unit on activated carbon was studied.The results show that the equilibrium time is 2 hours.It is beneficial for the adsorption when the pH value of waste water is about 3.0.The adsorption isothermal equation can be represented by Freundlich isotherm.The dynamic adsorption capacity is 63.46 mg/g.The regeneration extent of granular activated carbon is nearly 90% after it is immersed for 5 hours by 20% sodium hydrate.