Fenton催化氧化—生物联合处理硝基苯乙酮生产废水应用研究

发布时间：2018-06-17 21:13

本文选题：对硝基苯乙酮 + Fenton催化氧化　；参考：《扬州大学》2017年硕士论文

【摘要】：硝基苯类化合物是重要的化工原料之一,常用在染料、医药等行业。随着化工工业的发展,硝基苯类化合物不断的进入到人们的生活环境中。对硝基苯乙酮废水含有大量的硝基苯类化合物,高毒性、化学性质稳定、难生物降解、进入水体污染持续时间长等特点。由于该产品生产化工厂很少,导致当前对该种废水处理仍缺乏相对成熟的工艺。本文旨在研究物化法和生物法组合工艺对硝基苯乙酮生产废水的处理效果和适宜工艺条件。Fenton催化氧化技术在处理难降解有机污染物时具有独特的优势,由于试剂成本的较高,一般用于废水处理的预处理阶段,故选择Fenton催化氧化进行对硝基苯乙酮生产废水的化学预处理。通过一系列的试验研究,初步探究Fenton催化氧化体系中各因素对主要污染物降解效果的影响,以及最佳的Fenton试剂投加量。然而废水经过Fenton催化氧化处理后,对硝基苯乙酮生产废水可生化性得到明显的提高,但出水各项指标仍未达到《综合污水排放标准》。采用水解酸化/好氧对预处理后的对硝基苯乙酮生产废水进一步的生物处理,达到了对硝基苯乙酮废水的最终处理目标。同时采用探索的适宜工艺条件进行实际工程的技术指导,进一步的探究该组合工艺对该种废水的降解效果。研究表明:1.Fenton催化氧化体系处理对硝基苯乙酮生产废水的工艺最佳条件探索试验可得出:a)Fenton催化氧化体中FeS04 · 7H20的投加量对其影响最大,pH值和双氧水投加量的影响次之;b)在室温条件下,当FeS04·7H20的投加量为2.5g/L,pH值为3.0,双氧水的体积分数为0.9%,反应时间为120min时,Fenton处理效果最佳;c)最优条件下硝基苯类去除率为94.87%,CODcr的去除率达到57.58%。2.采用水解酸化/好氧组合处理工艺对经过Fenton催化氧化对硝基苯乙酮生产废水进行进一步的生化实验,达到了对硝基苯乙酮生产废水最终处理目标。试验发现,水解酸化能承受的最大进水浓度为CODcr=1200mg/L,此时CODcr去除率达到55.25%,硝基苯类的去除率为95.61%;水解酸化后出水好氧处理,CODcr总去除率上升至79.18%,满足出水指标国家污水综合排放三级标准(GB8978-1996)相关规定(CODcr500mg/L,硝基苯类含量5mg/L)。3.现场对硝基苯乙酮生产废水采用混合酸析-Fenton催化氧化-水解酸化-A/O-臭氧氧化-接触氧化工艺处理,参照实验室得出结果进行相关调试,出水CODcr为220mg/L(500mg/L)、硝基苯类含量为1.5mg/L(5mg/L)、色度为75倍(80倍)、总氮为35mg/L(75mg/L),各项指标达到园区管网接收的标准,且满足国家污水综合排放三级标准(GB8978-1996),且稳定运行达到半年以上。同时处理废水成本为3.91元/吨,适合工程化应用。
[Abstract]:Nitrobenzene compounds are one of the important chemical raw materials, commonly used in dye, medicine and other industries. With the development of chemical industry, nitrobenzene compounds come into people's living environment. P-nitroacetophenone wastewater contains a large number of nitrobenzene compounds, which is highly toxic, stable in chemical properties, difficult to biodegrade, and has long duration of entering water pollution. Due to the few chemical plants, there is still a lack of mature process for the treatment of this kind of wastewater. The purpose of this paper is to study the treatment effect of p-nitroacetophenone wastewater by physicochemical and biological processes and its suitable conditions. Fenton catalytic oxidation technology has unique advantages in the treatment of refractory organic pollutants, due to the high cost of reagent. It is generally used in the pretreatment stage of wastewater treatment, so Fenton catalytic oxidation is chosen for chemical pretreatment of p-nitroacetophenone production wastewater. Through a series of experimental studies, the effects of various factors on the degradation of main pollutants in Fenton catalytic oxidation system and the optimum dosage of Fenton reagent were studied. However, after Fenton catalytic oxidation, the biodegradability of p-nitroacetophenone wastewater was improved obviously, but the effluent indexes were still not up to the Comprehensive sewage discharge Standard. Further biological treatment of p-nitroacetophenone wastewater was carried out by hydrolytic acidification / aerobic treatment, and the final treatment goal of p-nitroacetophenone wastewater was achieved. At the same time, the technical guidance of practical engineering was carried out under the suitable technological conditions, and the effect of the combined process on the degradation of this kind of wastewater was further explored. The results show that: 1. Fenton catalytic oxidation system for the treatment of p-nitroacetophenone wastewater can be found that the addition of FeS04 7H20 in Fenton catalytic oxidation system has the greatest influence on the pH value and the amount of hydrogen peroxide. At room temperature, When the dosage of FeS04 7H20 is 2.5 g / L ~ (-1) pH = 3.0, the volume fraction of hydrogen peroxide is 0.9, and the reaction time is 120min, the removal rate of nitrobenzene is 94.87% and the removal rate of COD _ (cr) is 57.58 路2. Further biochemical experiments were carried out on the wastewater from p-nitroacetophenone production by Fenton catalytic oxidation with hydrolytic acidification / aerobic treatment process. The final treatment goal of p-nitroacetophenone wastewater was achieved. The experiment found that, The maximum influent concentration of hydrolytic acidification is 1 200 mg / L, the CODcr removal rate is 55.25 and the removal rate of nitrobenzene is 95.61%. Standard GB 8978-1996) related regulations CODCR 500 mg / L, nitrobenzene content 5 mg / L ~ (3). The wastewater from the production of p-nitroacetophenone was treated by mixed acid-eluter-Fenton catalytic oxidation-hydrolytic acidification-A / O -ozone oxidation-contact oxidation process, and the relevant debugging was carried out according to the results obtained from the laboratory. The effluent CODcr is 220 mg / L = 500 mg / L, the content of nitrobenzene is 1.5 mg / L / L ~ (5) mg / L, the chroma is 75 times ~ 80 times, the total nitrogen is 35 mg / L ~ (75) mg / L ~ (-1), all the indexes meet the standard of receiving the park pipe network, and meet the national comprehensive wastewater discharge standard (GB8978-1996), and run steadily for more than half a year. At the same time, the cost of wastewater treatment is 3.91 yuan / ton, which is suitable for engineering application.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X783

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