【作者】 杨彩玲；

【导师】 魏瑞霞；

【作者基本信息】 河北理工大学 ， 市政工程， 2010， 硕士

【摘要】 通过研究国产的ND-99树脂、日本的SP-825树脂、美国的XAD-16树脂对苯酚和间甲酚的吸附行为,吸附热力学和吸附动力学,以指导树脂吸附法处理煤焦油废水实验。实验结果表明:在同一温度下,对同种吸附质的吸附能力呈现ND-99>SP-825>XAD-16的趋势;Freundlich吸附等温方程可以很好的解释298K、308K、318K时ND-99、SP-825和XAD-16三种树脂对苯酚和间甲酚的吸附行为;在研究的温度范围内,吸附焓变均为负值,即三种树脂对苯酚和间甲酚的吸附为放热反应;吸附自由能变均为负值,即三种树脂对苯酚和间甲酚的吸附均是自发反应,且ND-99树脂的吸附自由能变比SP-825树脂和XAD-16树脂大;三种树脂的熵变均为负值,这是由于吸附质分子运动的自由度由溶液的三维空间限制于吸附剂的二维表面,运动混乱度降低导致了熵值减少;298K、308K、318K时ND-99、SP-825和XAD-16三种树脂对苯酚和间甲酚的吸附动力学符合准一级动力学方程;达到吸附平衡所需时间XAD-16<SP-825<ND-99;随着温度的升高,达到吸附平衡所需时间缩短。酚类(苯酚及其衍生物)是工业废水中常见的高毒性、难降解有机物,同时又是有机化工的基本原料,在经济上具有重要意义。采用树脂吸附法处理废水容易实现废水的有效治理和污染物的资源化,因此,采用树脂吸附法处理煤焦油提取酚生产废水,将对社会效益、环境效益、经济效益产生重大意义。通过对ND-99树脂的吸附-脱附最佳工艺的研究,得出:ND-99树脂处理效果良好,出水无色透明,可生化性较处理前明显提高。最佳吸附-脱附工艺条件是:pH值为4.0~5.0,吸附流量为2BV/h,吸附温度为20～30℃,单柱处理量:15BV/批,双柱串联处理量:25BV/批;脱附剂采用1BV8%NaOH+1BV4%NaOH+3BVH2O,脱附温度为50℃,脱附流量为1BV/h;采用异丙醚萃取法可回收高浓度脱附液中的粗酚;多批次小试和放大稳定性实验表明,ND-99树脂的吸附-脱附性能稳定。更多还原

【Abstract】 It is aimed to guide the treatment and resource reuse of wastewater of phenol extraction from coal tar by studying adsorption behavior, adsorption thermodynamics and adsorption kinetics of the three kinds of resin to phenol and m-crenol, macroporous resin of ND-99 resin made in our nation, SP-825 resin produced in United States, XAD-16 resin made in Japan, and results show that: at the same temperature, adsorption capacities rendering ND-99>SP-825>XAD-16 trend to be the same kind of adsorbate; Freundlich isotherm equation can be a very good explanation of adsorption behaviors of phenol and m-cresol on ND-99, SP-825 and XAD-16 resin at 298K, 308K, and 318K; in the study temperature range, the adsorption enthalpies are negative, indicating that adsorptions of phenol and m-cresol on three kinds of resin are exothermic reaction; the adsorption free energy changes are all negative, indicating that adsorptions of phenol and m-cresol on three kinds of resin are spontaneous, the adsorption free energy change of ND-99 resin is larger than SP-825 and XAD-16 resin; the entropy change of the resins are negative, because freedom degrees of molecular movement of adsorbates are limited from three-dimensional space in solution to two-dimensional surface of adsorbents, the lower degree of movement disorder will lead to entropy reduction; adsorption kinetics of phenol and m-cresol on ND-99, SP-825 and XAD-16 resin at 298K, 308K, and 318K conform to the first-level dynamic equation; time for reaching adsorption equilibrium rendering XAD-16<SP-825<ND-99; the adsorption time decreases as temperature increases.Phenols (phenol and its derivatives) are common high toxic and difficultly biodegradable organic matter in industrial wastewater, but they are also basic raw materials of organic chemical and of economically significance. It will treat the wastewater and resource reusing the waste by resin adsorption. Accordingly, treating and resource reusing wastewater of phenol extraction from coal car will have significance for social, environmental and economical benefit. By the studies of the best adsorption-desorption process of ND-99 resin, it’s found that: the treatment result of ND-99 resin is good, the adsorbed water is colorless and transparent, biodegradability is markedly improved compared with pretreatment. The best adsorption-desorption process conditions are list as follows: pH is 4.0~5.0; adsorption flow is 2BV/h; adsorption temperature is 20~30℃; processing capacity of single-column is 15BV/batch; processing capacity of double-column by series is 25BV/batch; desorption temperature is 50℃; desorption agent is 1BV8%NaOH+1BV4%NaOH+3BVH2O; desorption flow is 1BV/h; crude phenol in high concentration desorption fluid can be recovered by isopropyl ether extraction; many small-scale and larger-batches of experiments show that the properties of adsorption-desorption of ND-99 resin is stable, and treating result of water is stable and reliable.更多还原