【作者】 陈伟；

【导师】 韩伟； 吴华志；

【作者基本信息】 华东理工大学 ， 化学工程， 2010， 硕士

【摘要】 在芳香族羧酸的生产过程中会产生大量高浓度有机废水,这种废水它具有污染物浓度高、水质水量变化大、污染物种类多及pH值波动范围大等特点,是较难处理的石油化工废水之一,如果将其直接排放,将会对水生生态造成破坏,所以必须予以处理。本文采用Fenton氧化法对PTA精制废水1进行研究,考察了pH值、FeSO4·7H2O投加量、过氧化氢投加量、过氧化氢投加方式和反应时间等条件对处理效果的影响,结合正交试验,并且考虑生产实际,得到了较佳的操作条件：pH为3.0,过氧化氢一次性投加量为20mL/L, FeSO4·7H2O加入量1.5g/L,曝气时间3h,操作温度55℃,在该条件下PTA精制废水1的COD去除率达到65.5%。对比各种型号大孔树脂对预处理后PTA精制废水2的处理效果,选用HPD-950型大孔树脂。考察了树脂加入量、吸附温度、吸附pH值及振荡强度对大孔树脂吸附过程的影响,发现温度降低、pH值降低、振荡强度增加对吸附处理过程有利；得到了大孔树脂处理废水的较佳操作条件：树脂加入量为8g/L、振荡时间为2.5h、吸附温度为25℃、振荡强度为200rpm和pH值为4。通过动态实验考察了工业化所关注的停留时间,运行时间和再生时间对树脂吸附效果的影响,得出了最佳的操作条件为：停留时间为30min,运行时间为50h,再生时间为30min, PTA精制废水2中COD去除率可达到90%以上。在此基础上采用离子交换法对PTA精制废水3进行深化处理,使PTA精制废水3中金属离子含量达标。通过树脂的筛选实验,发现LS101较为合适PTA废水的处理,当树脂的加入量为5mL/L废水时,废水中金属离子的去除达到了89.7%。随着温度的升高,离子交换反应速度加快,交换容量变化也加快,达到平衡所需时间减少,温度过高时树脂结构会发生微小变化,从而影响了交换能力,所以体系温度超过45℃以后,树脂的效率明显降低。我们选择45℃为最优温度。通过盐酸再生可以恢复饱和树脂的活性,使用静态浸泡方式,再生剂用量：LS101树脂用量仅为90mL:60mL。更多还原

【Abstract】 The process of producing PTA produces large amount of organic waste water, which contain high concentration of various organic pollutants (acidic aromatic organic compounds) with wide range of pH values. The organic pollutants with benzene ring structure in waste water are stable, so they are difficult to biodegradate. Photocatalytic degradation has been developed for degradation of molecule-structure complex contaminants recently. Meanwhile, photocatalytic reaction sensitized by TiO2 has attracted extensive interests as a potential way to treat wastewater due to its high photocatalytic stability and efficiency, and non-toxic to the health of human livings:The treatment of PTA wastewater one by Fenton oxidation has been investigated. The influence of pH, the dosage of FeSO4·7H2O and H2O2, the dosing method of H2O2 and reaction time on treatment efficiency have been studied. With orthogonal experiments and considering of the actual production, the optimized operating conditions had been obtained: pH 3.0, one-time dosage of H2O2 20mL/L, dosage of FeSO4·7H2O 1.5g/L, reaction time 3h, 55℃, COD removal efficiency of the PTA wastewater was 65.5%.The HPD-950 macroporous resin was ultimately chosen to reduce COD of PTA wastewater two further. The influences of the usage of HPD-950, temperature of adsorption, pH value, and oscillation intensity had been investigated. The results showed that with the decrease of temperature and pH, and increase of oscillation intension, adsorption efficiency increased. The obtained optimum adsorption conditions were:pH value 4, temperature 25℃, usage of macroporous resin 8g, and the oscillation intention 200rpm. The effects of residence time, running time and regeneration time on resin adsorption efficiency had been investigated through dynamic experiments. The optimum operating conditions:residence time was 30min, running time was 50h, regeneration time was 30min, COD removal efficiency of the PTA wastewater was above 90%.Handle the wastewater with ion exchange method to make the metal ion reach the standard. Through screening experiment, the resin LS101 was suitable for PTA wastewater three treatment relatively. When the resin addition amount was 5mL/L wastewater, the metal ions removal reached 89.7%. As the temperature increases, ion exchange reaction speed-up, the exchange capacity change also accelerates, the time needed for balance decreases. Resin structure will happen small changes at high temperature, which affects the exchange capacity, so when the temperature system over 45℃, resin efficiency decreased obviously. we choose 45℃for the best temperture.The hydrochloric acid regeneration can restore the activity of saturated resin. Using a static immersion method, the rate of regeneration agent and the resin LS101 is only 90mL:60mL.更多还原