Fenton-流化床处理制革废水的试验研究
发布时间：2018-11-23 07:04
【摘要】：作为主要工业污染源之一,制革废水通常具有污染物浓度高及难生物降解的特点,仅仅通过生化处理已难以满足愈发严格的排放标准要求,因此亟需开发出制革废水深度处理的新工艺。本文以某皮革厂制革废水为研究对象,针对该厂污水站生化处理部分原有氧化沟前新增A/O工艺后出水仍不达标的问题,决定通过Fenton反应对生化出水进行深度处理。首先通过小试试验对比传统Fenton和Fenton-流化床的处理效果,利用正交试验考察废水初始p H值、双氧水投加量、硫酸亚铁与过氧化氢摩尔浓度比(即硫酸亚铁投加量)及反应时间对COD去除率的影响程度,再经过单因素试验确定最佳反应条件。传统Fenton的正交试验结果表明,各因素对COD去除率的影响程度依次为:[Fe2+]/[H2O2](摩尔浓度比)p HH2O2投加量反应时间;单因素试验结果确表明最佳反应条件为:初始p H值3,30%双氧水投加量0.8m L/L,[Fe2+]/[H2O2]=0.8,搅拌反应时间20min,曝气时间30min,絮凝沉淀部分PAM(0.1%)投加量2m L/L,此时出水COD为49.9mg/L,COD去除率为59.8%。Fenton-流化床的正交试验结果表明各因素对COD去除率的影响程度依次为:H2O2投加量p H反应时间[Fe2+]/[H2O2](摩尔浓度比);单因素试验结果表明最佳反应条件为:铁氧化物负载石英砂填充率10%(140g/L),初始p H值3,30%双氧水投加量0.8m L/L,[Fe2+]/[H2O2]=0.1(Fe SO4·7H2O投加量0.22g/L),反应时间60min,曝气时间30min,絮凝沉淀部分PAM(0.1%)投加量2m L/L,此时出水COD为43.7mg/L,去除率为64.8%。对比两种工艺可看出在相同工艺条件下,双氧水投加量均为0.8m L/L时,Fenton-流化床比传统Fenton的COD去除率高5%,Fe SO4·7H2O投加量减少了87.5%,铁泥产率降低了64.0%。综上可知Fenton-流化床工艺深度处理制革废水的效果优于传统Fenton工艺,并且为进一步验证Fenton-流化床在工程中的实际应用效果,在小试阶段确定最佳加药量基础上,扩大至中试,以验证试验在工程上应用的效果并继续探索最佳加药量。此外,本研究也对污水站生化处理部分新建A/O工艺及深度处理部分Fenton-流化床的运行效果进行了简要的分析,并探讨了新建A/O对原有氧化沟的影响。
[Abstract]:As one of the main industrial pollution sources, tannery wastewater is usually characterized by high concentration of pollutants and difficult to biodegrade. It is difficult to meet the more stringent emission standards by biochemical treatment alone. Therefore, it is urgent to develop a new process for advanced treatment of tannery wastewater. In this paper, a tannery wastewater was studied. Aiming at the problem that the effluent was still not up to the standard after adding A / O process before the original oxidation ditch at the wastewater treatment station of this plant, it was decided to carry out advanced treatment of the biochemical effluent through Fenton reaction. Firstly, the initial pH value of wastewater and the dosage of hydrogen peroxide were investigated by orthogonal test compared with the conventional Fenton and Fenton- fluidized bed. The molar ratio of ferrous sulfate to hydrogen peroxide (that is, the dosage of ferrous sulfate) and the reaction time affect the removal rate of COD. The optimum reaction conditions were determined by single factor test. The orthogonal test results of traditional Fenton show that the degree of influence of each factor on COD removal efficiency is as follows: [Fe2] / [H2O2] (molar concentration ratio) p HH2O2 dosage reaction time; The results of single factor test show that the optimum reaction conditions are as follows: initial pH value of 30% hydrogen peroxide is 0.8 mL / L, [Fe2] / [H2O2] = 0.8, stirring time 20 min, aeration time 30 min. The dosage of PAM (0.1%) is 2m L / L, and the effluent COD is 49.9 mg / L, The orthogonal experiment of COD removal rate of 59.8% 路Fenton-Fluidized bed showed that the degree of influence of various factors on COD removal efficiency was as follows: H2O2 dosage pH reaction time [Fe2] / [H2O2] (molar concentration ratio); The results of single factor test show that the optimum reaction conditions are as follows: the filling ratio of ferric oxide loaded quartz sand is 10% (140g/L), the initial pH value is 3 ~ (30)% hydrogen peroxide, the dosage of hydrogen peroxide is 0.8 mL / L, [Fe2] / [H2O2] = 0.1 (Fe SO4 7H2O dosage 0.22g/L), reaction time 60 min, aeration time 30 min, flocculation sedimentation part PAM (0.1%) dosage 2m L / L, and effluent COD 43.7 mg / L, The removal rate was 64.8%. By comparing the two processes, it can be seen that under the same conditions, when the dosage of hydrogen peroxide is 0.8ml / L, the COD removal rate of Fenton- fluidized bed is 5% higher than that of traditional Fenton, and the dosage of Fe SO4 7H2O decreases by 87.5%. The yield of iron sludge decreased by 64.0%. It is concluded that the effect of advanced treatment of tannery wastewater by Fenton- fluidized bed process is superior to that of traditional Fenton process, and in order to further verify the practical application effect of Fenton- fluidized bed in engineering, the optimal dosage is determined in the small trial stage and expanded to the pilot test. In order to verify the application of the test in engineering and continue to explore the optimal dosage. In addition, the operation effect of the new A / O process and the Fenton- fluidized bed for advanced treatment were analyzed briefly, and the influence of the new A / O on the original oxidation ditch was discussed.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X794
本文编号：2350717
[Abstract]:As one of the main industrial pollution sources, tannery wastewater is usually characterized by high concentration of pollutants and difficult to biodegrade. It is difficult to meet the more stringent emission standards by biochemical treatment alone. Therefore, it is urgent to develop a new process for advanced treatment of tannery wastewater. In this paper, a tannery wastewater was studied. Aiming at the problem that the effluent was still not up to the standard after adding A / O process before the original oxidation ditch at the wastewater treatment station of this plant, it was decided to carry out advanced treatment of the biochemical effluent through Fenton reaction. Firstly, the initial pH value of wastewater and the dosage of hydrogen peroxide were investigated by orthogonal test compared with the conventional Fenton and Fenton- fluidized bed. The molar ratio of ferrous sulfate to hydrogen peroxide (that is, the dosage of ferrous sulfate) and the reaction time affect the removal rate of COD. The optimum reaction conditions were determined by single factor test. The orthogonal test results of traditional Fenton show that the degree of influence of each factor on COD removal efficiency is as follows: [Fe2] / [H2O2] (molar concentration ratio) p HH2O2 dosage reaction time; The results of single factor test show that the optimum reaction conditions are as follows: initial pH value of 30% hydrogen peroxide is 0.8 mL / L, [Fe2] / [H2O2] = 0.8, stirring time 20 min, aeration time 30 min. The dosage of PAM (0.1%) is 2m L / L, and the effluent COD is 49.9 mg / L, The orthogonal experiment of COD removal rate of 59.8% 路Fenton-Fluidized bed showed that the degree of influence of various factors on COD removal efficiency was as follows: H2O2 dosage pH reaction time [Fe2] / [H2O2] (molar concentration ratio); The results of single factor test show that the optimum reaction conditions are as follows: the filling ratio of ferric oxide loaded quartz sand is 10% (140g/L), the initial pH value is 3 ~ (30)% hydrogen peroxide, the dosage of hydrogen peroxide is 0.8 mL / L, [Fe2] / [H2O2] = 0.1 (Fe SO4 7H2O dosage 0.22g/L), reaction time 60 min, aeration time 30 min, flocculation sedimentation part PAM (0.1%) dosage 2m L / L, and effluent COD 43.7 mg / L, The removal rate was 64.8%. By comparing the two processes, it can be seen that under the same conditions, when the dosage of hydrogen peroxide is 0.8ml / L, the COD removal rate of Fenton- fluidized bed is 5% higher than that of traditional Fenton, and the dosage of Fe SO4 7H2O decreases by 87.5%. The yield of iron sludge decreased by 64.0%. It is concluded that the effect of advanced treatment of tannery wastewater by Fenton- fluidized bed process is superior to that of traditional Fenton process, and in order to further verify the practical application effect of Fenton- fluidized bed in engineering, the optimal dosage is determined in the small trial stage and expanded to the pilot test. In order to verify the application of the test in engineering and continue to explore the optimal dosage. In addition, the operation effect of the new A / O process and the Fenton- fluidized bed for advanced treatment were analyzed briefly, and the influence of the new A / O on the original oxidation ditch was discussed.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X794
【参考文献】
相关期刊论文 前1条
1 谢银德,陈锋,何建军,赵进才;Photo-Fenton反应研究进展[J];感光科学与光化学;2000年04期
，本文编号：2350717
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