硫酸活化市政污泥对氨氮的吸附研究

发布时间：2018-04-16 04:30

本文选题：硫酸活化 + 剩余污泥　；参考：《中国给水排水》2016年17期

【摘要】：采用污水厂剩余污泥作为原料,以硫酸作为活化剂制备吸附剂,并将其应用到含氨氮废水处理中。进而系统地研究了溶液初始p H值、氨氮初始浓度、吸附时间等因素对硫酸活化市政污泥吸附氨氮的影响。结果表明,在吸附剂投加量为2 g/L、p H值为7.5、温度为303 K条件下,硫酸活化市政污泥对氨氮的吸附效果最佳。吸附动力学和热力学研究结果表明,吸附剂对氨氮的吸附过程可用准二级动力学模型(R2=0.998 6)来描述,且均符合Langmuir等温吸附模型、Freundlich等温吸附模型和Temkin等温吸附模型。由Langmuir等温吸附模型计算得到活化市政污泥对氨氮的最大吸附容量为44.84 mg/g。颗粒内扩散速率也是其吸附反应的限制因素,但不是唯一限制因素。该研究表明硫酸活化剩余污泥可以作为处理含氨氮废水的材料。
[Abstract]:The adsorbent was prepared by using the excess sludge of the wastewater treatment plant as raw material and sulfuric acid as the activator, and was applied to the treatment of wastewater containing ammonia nitrogen.Furthermore, the effects of initial pH value of solution, initial concentration of ammonia nitrogen and adsorption time on the adsorption of ammonia nitrogen by municipal sludge activated by sulfuric acid were studied systematically.The results showed that the adsorption effect of activated municipal sludge on ammonia nitrogen was the best when the adsorbent dosage was 2 g / L ~ (-1) H = 7.5 and the temperature was 303K.The results of adsorption kinetics and thermodynamics show that the adsorption process of ammonia nitrogen by adsorbent can be described by the quasi-second-order kinetic model R20.998 6) and all of them are in accordance with the Langmuir isothermal adsorption model and the Temkin isothermic adsorption model.According to the Langmuir isothermal adsorption model, the maximum adsorption capacity of activated municipal sludge for ammonia nitrogen was 44.84 mg / g.Intraparticle diffusion rate is also the limiting factor for the adsorption reaction, but it is not the only limiting factor.This study showed that activated sludge with sulfuric acid can be used as a material for the treatment of wastewater containing ammonia nitrogen.
【作者单位】：湖南城市学院市政与测绘工程学院;
【基金】：湖南省教育厅一般项目(15C0260);湖南省教育厅优秀青年项目(13B009) 湖南省高校产学研合作示范基地项目(湘教通[2014]239号)
【分类号】：X703

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