本文關(guān)鍵詞：過(guò)硫酸鹽高級(jí)氧化法降解水中草除靈的實(shí)驗(yàn)研究　出處：《江西理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 過(guò)硫酸鹽 過(guò)一氧硫酸氫鹽 高級(jí)氧化 影響因素 反應(yīng)動(dòng)力學(xué) 降解機(jī)理 自由基鑒定

【摘要】：飲用水源中頻繁檢測(cè)出的除草劑等農(nóng)藥污染物等已經(jīng)引起人們的廣泛關(guān)注,且已經(jīng)威脅到人們的身體健康。過(guò)硫酸鹽高級(jí)氧化技術(shù)作為一種新型的水處理技術(shù),是當(dāng)前的水處理技術(shù)中的研究熱點(diǎn)。本論文選取除草劑之一的草除靈為去除對(duì)象,研究用過(guò)硫酸鹽高級(jí)氧化法降解草除靈。主要研究了基于紫外激活的高級(jí)氧化系統(tǒng)和基于熱激活的高級(jí)氧化系統(tǒng),從影響因素、動(dòng)力學(xué)模型等角度對(duì)比考察了系統(tǒng)對(duì)草除靈的降解性能及其機(jī)理,為過(guò)硫酸鹽高級(jí)氧化法在實(shí)際水處理中的應(yīng)用提供理論基礎(chǔ)。在紫外激活PS和PMS系統(tǒng)和熱激活PS系統(tǒng)中均選取了草除靈初始濃度、氧化劑投加量、pH值、腐殖酸濃度作為影響因子進(jìn)行了研究,并在UV/PS系統(tǒng)和熱激活PS系統(tǒng)中研究了水中常見(jiàn)陰離子的影響。研究表明,UV/PS、UV/PMS和熱激活PS工藝均能夠有效的降解草除靈,并且在UV/PS、UV/PMS和熱激活PS的各個(gè)工況條件下,草除靈的降解反應(yīng)總是復(fù)合一級(jí)反應(yīng)動(dòng)力學(xué)。所有系統(tǒng)中隨著草除靈初始濃度的降低,草除靈的降解率都不斷提高,且一級(jí)動(dòng)力學(xué)常數(shù)kobs值和草除靈初始濃度之間呈指數(shù)關(guān)系。在所有系統(tǒng)中增加氧化劑的濃度能使草除靈的降解率得到提高,且氧化劑濃度和草除靈的一級(jí)降解速率常數(shù)kobs值和呈現(xiàn)線性關(guān)系。UV/PS系統(tǒng)中,溶液pH為酸性或堿性都對(duì)草除靈的降解速率有一定程度提升,在中性條件下的草除靈降解效率最差。在UV/PMS系統(tǒng)中,pH對(duì)草除靈的降解速率影響不明顯,整體來(lái)看在酸性條件的降解率好于中性和堿性條件。對(duì)熱激活PS系統(tǒng),中性條件下草除靈的降解速率最慢,而在堿性和酸性條件下降解速率都有上升,而且在堿性條件下的降解效果比酸性條件下要好。在所有系統(tǒng)中高濃度的腐殖酸的存在都會(huì)和草除靈的降解產(chǎn)生競(jìng)爭(zhēng)關(guān)系,但是在熱激活PS系統(tǒng)中發(fā)現(xiàn)低濃度的腐殖酸能促進(jìn)草除靈的降解。通過(guò)向系統(tǒng)中投加TBA和EtOH,發(fā)現(xiàn)在UV/PS體系中主要起作用的是OH·,在UV/PMS體系中OH·和SO_4~-·同時(shí)起作用。在熱激活系統(tǒng)中,酸性條件下系統(tǒng)中存在的自由基主要為SO_4~-·,在堿性條件下系統(tǒng)中存在的自由基主要為OH·。在UV/PS系統(tǒng)和熱激活PS系統(tǒng)中,投加不同濃度的Cl~-,NO_3~-,HCO_3~-后均符合一級(jí)動(dòng)力學(xué)模型,且投加Cl~-,NO_3~-,HCO_3~-均會(huì)在不同程度上抑制草除靈的降解,對(duì)草除靈的抑制程度大小符合HCO_3~-Cl~-NO_3~-的規(guī)律。
[Abstract]:Pesticide pollutants, such as herbicides, which are frequently detected in drinking water sources, have attracted extensive attention and have threatened people's health. Advanced oxidation technology of persulfate is a new water treatment technology. It is a hot research topic in the current water treatment technology. In this paper, one of the herbicides, Herbicide, is selected as the removal object. In this paper, the advanced oxidation system based on ultraviolet activation and the advanced oxidation system based on thermal activation were studied. The degradation performance and mechanism of the system were investigated from the point of view of kinetic model. In order to provide the theoretical basis for the application of persulfate advanced oxidation method in practical water treatment, the initial concentration and the dosage of oxidant were selected in UV activated PS, PMS system and thermal activated PS system. The pH value and humic acid concentration were used as the influencing factors, and the influence of common anions in water was studied in UV/PS system and thermally activated PS system. Both UV/PMS and heat activated PS process can effectively degrade Herba Chlorophylline, and under the conditions of UV / PSV / PSV / PMS and thermal activated PS under various operating conditions. The degradation rate of Caoziling was increased with the decrease of initial concentration in all systems. There was an exponential relationship between the kobs value of first-order kinetic constant and the initial concentration of Caoziling, and the degradation rate was increased by increasing the concentration of oxidant in all systems. The concentration of oxidant and the kobs value of the first-order degradation rate constant of Caoziling were linearly related. In the system of UV / PS, the pH value of the solution was acidic or alkaline, and the degradation rate of Caozidine was improved to a certain extent. In UV/PMS system, the effect of pH on the degradation rate was not obvious. On the whole, the degradation rate in acidic condition was better than that in neutral and alkaline condition. For thermally activated PS system, the degradation rate of Zaoziling was the slowest in neutral condition, but increased in alkaline and acidic conditions. And the degradation effect in alkaline condition is better than that in acid condition. In all systems, the existence of high concentration of humic acid will be competitive with the degradation of Herba Chlorophylline. However, it was found that the low concentration of humic acid could promote the degradation of Chlorophylline in the thermal activated PS system. By adding TBA and EtOH into the system, it was found that the main action in the UV/PS system was OH 路. In the UV/PMS system, OH 路and SO4- 路work simultaneously. In the thermal activation system, the main free radicals in the acidic system are so _ 4C _ (- 路). In the alkaline system, the main free radicals are OH 路. In the UV/PS system and the thermally activated PS system, different concentrations of Cl-No _ 3- are added to the system. All HCOs were in accordance with the first-order kinetic model, and the addition of Cl-No3C / HCO3- could inhibit the degradation of Chlorophyllum to varying degrees. The degree of inhibition to Caiziling was in accordance with the law of HCO3C- Cl-NO3-.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：X592;X703

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