Fenton氧化法—水解酸化法预处理巯基丙酸废水的实验研究

发布时间：2018-04-22 08:33

本文选题：巯基丙酸废水 + Fenton氧化法　；参考：《重庆三峡学院》2017年硕士论文

【摘要】：巯基丙酸是一种重要的精细化工产品,在其生产过程中产生了大量高浓度难降解有机废水,这种高浓度难降解有机废水是废水处理的一大难点。本研究主要针对此疏基丙酸废水难处理这一问题,对其生物处理前的预处理工艺进行实验研究。同时针对实际废水内含Fe2+的特征,提出将Fenton氧化技术与水解酸化技术联合应用于疏基丙酸废水的预处理。研究内容主要包括:Fenton氧化技术的最佳运行条件及处理效果、Fenton氧化技术的动力学实验、水解酸化工艺对Fenton氧化出水处理的最佳运行条件及效果,最后针对联合工艺预处理之后的出水进行了初步的后续生化实验研究,本研究以COD作为水质的主要评价指标。Fenton氧化技术预处理巯基丙酸废水单因素实验,确定了 Fenton氧化法的最佳运行参数:30%H2O2投加量为1/6Qth(34.8mL/L),分三次投加,pH值为4,反应时间为120min,废水COD去除率为92.96%。正交实验结果表明,各因素对出水COD的影响主次顺序为:pH值H202投加量反应时间投加方式。最优组合为pH值为4.0,反应时间为90min,H2O2投加量为1/6Qth(34.8ml/L),分三次投加,COD去除率可达到90%。Fenton氧化法降解COD动力学研究表明,Fenton氧化反应基本符合二级反应动力学规律。通过实验数据的分析和计算得到Fenton氧化法降解巯基丙酸废水的动力学模型。研究了不同pH值、容积负荷、水力停留时间对水解酸化工艺处理Fenton氧化出水效果的影响。结果表明,pH=7时,COD去除效果最好,平均去除率达到9.3%,最高可达13.5%;在最佳pH条件下,反应器经过5次负荷冲击,随着进水COD浓度的增大,营养物质增多,微生物活性增强,COD去除率增大,呈上升趋势,在第8天去除率达到最大值,随后由于化工废水毒性的积累,导致微生物活性和降解能力下降,从而使COD去除率又呈下降趋势,最终反应器内微生物与有毒物质的积累达到平衡状态,废水COD去除率达到15%。随着反应时间的增加,在反应前4h内,COD去除率极速增大,之后增加缓慢,当反应时间为24h时COD去除率达到最大值15.3%。Fenton氧化-水解酸化联合预处理出水COD浓度为3820～4215 mg/L,COD去除率达到91.5%,Fenton氧化-水解酸化联合预处理工艺有利于废水的生化处理。后续生化实验表明,厌氧/好氧工艺出水COD浓度为955～1054 mg/L,原水COD去除率达到97%。
[Abstract]:Mercaptopropionic acid is an important fine chemical product, which produces a large amount of high concentration refractory organic wastewater, which is a major difficulty in wastewater treatment. In this study, the pretreatment process before biological treatment was studied in order to solve the problem of difficult treatment of sparsely propionic acid wastewater. At the same time, according to the characteristics of the actual wastewater containing Fe2, the combined application of Fenton oxidation technology and hydrolytic acidification technology in the pretreatment of sparse propionic acid wastewater was put forward. The main contents of the study include the optimal operation conditions and treatment effect of the Fenton oxidation technology and the kinetic experiment of the Fenton oxidation technology, and the optimum operation conditions and effects of hydrolytic acidification process on the oxidation of water out of Fenton. Finally, a preliminary biochemical experiment was carried out on the effluent treated by the combined process. In this study, COD was used as the main evaluation index of water quality. Fenton oxidation technology was used to pretreat mercapto propionic acid wastewater by single factor experiment. The optimal operation parameters of Fenton oxidation method were determined as follows: the dosage of H _ 2O _ 2 was 1 / 6QthH _ 2O _ 2 34.8 mL 路L ~ (-1), the pH value was 4, the reaction time was 120 min, and the removal rate of COD was 92.96%. The results of orthogonal experiment showed that the primary and secondary order of the influence of various factors on the effluent COD was the dosage of H _ (202) H _ 2O _ 2 as the reaction time. The optimum combination was pH 4.0, reaction time 90 min, H _ 2O _ 2 dosage 1 / 6 Q _ thH _ 2O _ 2 34.8 ml / L ~ (-1). The removal rate of COD by three times could reach the kinetics of COD degradation by 90%.Fenton oxidation method. The results showed that the oxidation of 90%.Fenton was basically in accordance with the second-order reaction kinetics. The kinetic model for degradation of mercapto propionic acid wastewater by Fenton oxidation was obtained by analyzing and calculating the experimental data. The effects of different pH values, volumetric loading and hydraulic retention time on the treatment of Fenton oxidized effluent by hydrolytic acidification process were studied. The results showed that the removal efficiency of COD was the best at pH = 7, the average removal rate was 9.3 and the highest was 13.5.The under the optimum pH condition, the reactor was subjected to five loading shocks, and the nutrient content increased with the increase of influent COD concentration. The removal rate of COD increased with the increase of microbial activity, and reached the maximum on the 8th day. Subsequently, the accumulation of toxicity of chemical wastewater led to the decrease of microbial activity and degradation ability, which made the removal rate of COD decrease again. Finally, the accumulation of microorganisms and toxic substances in the reactor reached equilibrium, and the COD removal rate of wastewater reached 15%. With the increase of reaction time, the removal rate of COD increased rapidly within 4 hours before the reaction, and then increased slowly. When the reaction time is 24 h, the COD removal rate reaches the maximum value. The COD removal rate of the effluent treated by 15.3%.Fenton oxidation combined with hydrolytic acidification is 3820 ~ 4215 mg / L ~ (-1). The combined pretreatment process of 91.5% Fenton oxidation and hydrolytic acidification is beneficial to the biochemical treatment of wastewater. The following biochemical experiments showed that the effluent COD concentration of anaerobic / aerobic process was 955 ~ 1054 mg / L, and the removal rate of COD in raw water was 97%.
【学位授予单位】：重庆三峡学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X78

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