污泥基吸附剂对邻苯二甲酸二甲酯（DMP）吸附性能研究

发布时间：2018-01-15 17:25

本文关键词：污泥基吸附剂对邻苯二甲酸二甲酯（DMP）吸附性能研究　出处：《广州大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着社会的发展和城市用水量的增加,污水处理厂排放污泥的数量越来越多,但现有的污泥处理方法和能力导致“污泥围城”的现象越来越严重。本研究提出以污泥作为原材料,通过化学活化法制备污泥基吸附剂,并用于邻苯二甲酸二甲酯(Dimethyl phthalate,DMP)的吸附。本文通过比表面积分析仪、扫面电子显微镜(Scanningelectron microscopy,SEM)、傅里叶变换红外光谱仪(Fourier transform infrared red,FT-IR)、Boehm滴定法、X-射线衍射光谱仪(X-ray diffraction,XRD)、同步热分析仪系统地对原始污泥和污泥基吸附剂的物理和化学特性进行对比分析。本文考察了污泥基吸附剂投加量、溶液pH值、吸附时间、温度和DMP初始浓度对DMP吸附效果的影响。结果表明:在吸附剂投加量4 g/L、pH=6、吸附时间2 h、DMP初始浓度1000 mg/L时,污泥基吸附剂对DMP的去除率为92.73%。通过动力学和吸附等温线研究可知,DMP吸附过程符合准二级动力学模型和Freundlich吸附等温线模型。本文还通过孔隙分布和表面相互作用(π-π键、氢键)对DMP吸附机理进行深层次的剖析,从而进一步了解污泥基吸附剂对DMP的吸附过程。本文采用化学再生法考察了再生时间、再生液浓度对饱和吸附剂再生附效果影响。结果表明,在再生时间2 h、再生液浓度1 mol/L时,DMP析出量大于230 mg/g。通过再生吸附剂的重复使用性实验可知,经过化学再生后的饱和吸附剂具有良好的重复使用性,重复使用7次后DMP去除率仍80%以上。通过安全性分析可知,原始污泥及其吸附剂中主要重金属含量和它们的浸出液浓度均低于最高允许浓度值,因此本实验所制备的污泥基吸附剂应用于污废水处理是安全可行的。
[Abstract]:With the development of society and the increase of urban water consumption, the quantity of sludge discharged from sewage treatment plant is increasing. However, the existing sludge treatment methods and capacity lead to more and more serious phenomenon of "sludge besieging". In this study, sludge is used as raw material to prepare sludge based adsorbent by chemical activation method. And used for the adsorption of dimethyl phthalate dimethyl phthalate DMP.The specific surface area analyzer was used in this paper. Scanning electron microscope (SEM). Fourier transform infrared red FT-IRT / Boehm titration method is used in Fourier transform infrared spectrometer. X-ray diffractometry (XRD). The physical and chemical properties of raw sludge and sludge based adsorbent were systematically analyzed by simultaneous thermal analyzer. The dosage of sludge based adsorbent, the pH value of solution and the adsorption time were investigated in this paper. The effect of temperature and initial concentration of DMP on the adsorption of DMP was studied. The results showed that the adsorption time was 2 h when the adsorbent dosage was 4 g / L ~ (-1) pH ~ (-1) ~ (6). When the initial concentration of DMP was 1 000 mg/L, the removal rate of DMP by sludge based adsorbent was 92.73. The kinetics and adsorption isotherm were studied. The adsorption process of DMP is in accordance with the quasi-second-order kinetic model and the Freundlich adsorption isotherm model. The pore distribution and surface interaction (蟺-蟺 bond) are also used in this paper. The adsorption mechanism of DMP was deeply analyzed to further understand the adsorption process of DMP by sludge based adsorbents. The regeneration time was investigated by chemical regeneration method. The results showed that the regeneration time was 2 h and the regeneration solution concentration was 1 mol/L. The amount of DMP precipitates is more than 230mg / g. The reusability experiment of regenerative adsorbent shows that the saturated adsorbent after chemical regeneration has good reusability. The DMP removal rate was still more than 80% after 7 times of repeated use. According to the safety analysis, the main heavy metals in the original sludge and its adsorbent and the concentration of their leachate were lower than the maximum allowable concentration. So it is safe and feasible to use sludge-based adsorbent in wastewater treatment.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X703

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