污水处理厂生化污泥质活性炭的制备及吸附特性

摘要:

以生化污泥为原料,氯化锌为改性剂,在550℃条件下制备了污泥活性炭。考察了不同初始pH对活性污泥炭吸附亚甲基蓝效果的影响,并进行了等温曲线和动力学模型的拟合。SEM图像结果显示制备的污泥活性炭表面粗糙,中空结构发达,制备过程中碳元素损失较多。试验结果表明,在研究范围内,活性污泥炭对亚甲基蓝的吸附量随pH的高而升高,但在3~9的区间内影响有限。活性污泥炭对亚甲基蓝的吸附符合Langmuir吸附等温线和伪二级动力学模型。

Abstract:

The activated sludge was prepared at 500 ℃ with biochemical sludge as raw material and zinc chloride as modifier. The effects of different initial pH on the adsorption of methylene blue on activated sludge were investigated .The isothermal curves and kinetic models were fitted. The results of SEM images show that the surface of the activated sludge is rough and the hollow structure is developed. The carbon loss in the preparation process is large. The experimental results show that the adsorption capacity of activated sludge to methylene blue increases with the increase of pH, but has limited effect in the range of 3 ~ 9. The adsorption of methylene blue on activated sludge was in accordance with the Langmuir adsorption isotherm and pseudo - second - order kinetics model.