钛白废酸活化制备污泥活性炭及其在榨菜废水处理中的应用

Preparation of sludge activated carbon via activation of waste acid from titanium dioxide production and its application in mustard tuber wastewater treatment

以城市污水处理厂二沉池脱水污泥为原料,钛白废酸为活化剂,采用化学活化法制备污泥活性炭(PAC)。考察了固液比、炭化时间、炭化温度对制备污泥活性炭吸附性能的影响,并通过正交实验得出最佳制备参数。将该污泥活性炭用于榨菜废水的处理,结果表明,当投加量为15 g/L、pH为中性、振荡时间为120 min时,榨菜废水中COD和TP的去除率分别为73.6%和99.1%。该污泥活性炭对榨菜废水中COD的吸附符合Langmuir等温模型和准二级动力学与Elovich方程。

Sludge activated carbon is prepared through chemical activation method by using dewatered sludge from a municipal wastewater treatment plant as raw materials and waste acid from titanium dioxide production as an activator.The effects of the ratio of solid to liquid,carbonization time and carbonization temperature on the adsorption performance of the prepared sludge activated carbon are inspected. The optimum preparation parameters are obtained by orthogonal experimental design.This sludge activated carbon is then used to treat with mustard tuber wastewater. The results show that the removal rates of COD and TP in the mustard tuber wastewater can reach 73. 6% and 99. 1%,respectively when the dosage of sludge activated carbon is 15 g·L（-1）,pH locates at neutral level and oscillation time lasts for 120 min.The adsorption performance of the prepared sludge activated carbon against COD in the mustard tuber wastewater tallies with Langmuir isothermal model,quasi-second-order kinetic and Elovich equation.