發(fā)布時(shí)間：2018-04-18 07:28

  本文選題：接觸氧化濾池 + 活性鐵錳氧化膜　； 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：砷是水體中的有毒污染物之一,飲用水砷污染已經(jīng)成為了全球范圍內(nèi)的嚴(yán)重問題,愈發(fā)威脅著人類的健康。砷(V)、鐵、錳和氨氮常共存于地下水中,鐵錳氧化物作為除砷吸附劑結(jié)合了鐵氧化物的強(qiáng)吸附性和錳氧化物的氧化性能,具有工藝簡單、操作簡便、環(huán)境友好、經(jīng)濟(jì)等優(yōu)點(diǎn)。本文通過對(duì)接觸氧化濾池去除地下水中砷(V)、鐵、錳和氨氮的效果研究,考察了濾池對(duì)四種污染物單獨(dú)及同步去除的效果,并對(duì)不同的水質(zhì)條件和工藝運(yùn)行參數(shù)對(duì)濾池除砷(V)效果的影響進(jìn)行了分析。結(jié)合活性鐵錳氧化膜吸附前后的材料表征,除砷(V)的特性及影響因素,探究接觸氧化濾池除砷(V)的機(jī)理,為接觸氧化濾池的工程實(shí)踐應(yīng)用提供了技術(shù)支持。接觸氧化濾池濾料表面的活性鐵錳氧化膜所含主要元素為鐵和錳,形態(tài)呈顆粒狀,具有豐富的空隙,為大量污染物吸附于鐵錳氧化膜上,提供了較大的接觸面積。濾池有較好的單獨(dú)去除砷(V)、鐵、錳、氨氮的能力,抗污染物沖擊負(fù)荷的能力較強(qiáng),同時(shí)也可以同步高效去除水中砷(V)、鐵、錳、氨氮。水中鐵、錳的存在可以促進(jìn)濾池對(duì)砷(V)的去除,且高負(fù)荷的鐵或錳共存時(shí),濾池依然能夠保證穩(wěn)定的除砷(V)能力。當(dāng)原水p H升高時(shí),砷(V)的去除效果略有下降,但在高砷地下水的p H(7.1~8.7)條件下,濾池除砷(V)效果良好。濾池進(jìn)水砷(V)負(fù)荷或?yàn)V池濾速的增大會(huì)導(dǎo)致濾層除砷(V)達(dá)標(biāo)深度增加,但中試實(shí)驗(yàn)中的進(jìn)水砷(V)濃度和濾速下,出水均能達(dá)標(biāo),表現(xiàn)出較優(yōu)異的抗沖擊負(fù)荷能力。接觸氧化濾池濾料表面的活性鐵錳氧化膜對(duì)砷(V)的去除機(jī)理實(shí)驗(yàn)表明,在吸附砷(V)的前后活性濾膜的形態(tài)特征沒有明顯的差別。在組成元素上,吸附前活性鐵錳氧化膜的主要組成元素是鐵和錳,吸附后有含有砷,表明其具有除砷的能力。在結(jié)構(gòu)上,吸附前后的晶體結(jié)構(gòu)基本沒有變化,吸附后活性鐵錳氧化膜形成了新的As-O鍵�；钚澡F錳氧化膜為性質(zhì)均一的吸附劑,對(duì)砷(V)的飽和吸附容量較大,吸附過程較快,為化學(xué)吸附,顆粒內(nèi)擴(kuò)散不是控制吸附過程的唯一步驟。活性鐵錳氧化膜表面電位和對(duì)砷(V)的吸附容量均隨p H值的升高而降低,CO_3~(2-)的共存會(huì)顯著抑制活性鐵錳氧化膜的吸附除砷(V)過程。隨活性鐵錳氧化膜投加量的增加,砷(V)的去除率增大,吸附容量隨之降低。
[Abstract]:Arsenic is one of the toxic pollutants in water. Arsenic pollution in drinking water has become a serious problem all over the world, which is increasingly threatening human health.Arsenic, iron, manganese and ammonia nitrogen often coexist in groundwater. Iron and manganese oxides, as adsorbents for arsenic removal, combine the strong adsorbability of iron oxides with the oxidation properties of manganese oxides, which have the advantages of simple process, simple operation, friendly environment, economic and so on.In this paper, the effects of contact oxidation filter on the removal of arsenic, iron, manganese and ammonia nitrogen from groundwater were studied, and the effects of the filter on the removal of four pollutants separately and synchronously were investigated.The effects of different water quality conditions and process parameters on the removal of arsenic and Von in the filter were analyzed.Combined with the characterization of materials before and after adsorption of active ferromanganese oxide film and the characteristics and influencing factors of arsenic removal, the mechanism of arsenic removal in contact oxidation filter was explored, which provided technical support for the engineering application of contact oxidation filter.The active ferromanganese oxide film on the surface of contact oxidation filter is mainly composed of iron and manganese, which is granular in shape and rich in void, which provides a large contact area for a large number of pollutants adsorbed on the ferromanganese oxide film.The filter has better ability of removing arsenic, iron, manganese and ammonia nitrogen alone, and has strong ability to resist the impact load of pollutants. At the same time, it can also simultaneously and efficiently remove arsenic, iron, manganese and ammonia nitrogen in water.The existence of iron and manganese in water can promote the removal of arsenic (V) from the filter, and when the iron or manganese coexists with high load, the filter can still guarantee the stable ability of removing arsenic and Von.When pH increased in raw water, the removal efficiency of arsenic (V) decreased slightly, but under the condition of high arsenic groundwater (pH 7.1 ~ 8. 7), the filter had a good removal effect.The increase of the influent arsenic (V) load or the filter speed of the filter will lead to the increase of the depth of arsenic removal in the filter layer. However, under the concentration and the filtration rate of the influent arsenic (V) in the pilot experiment, the effluent can reach the standard, showing a better ability of resisting the shock load.The removal mechanism of active ferromanganese oxide film on the surface of contact oxidized filter media shows that there is no obvious difference in the morphological characteristics of the active filter membrane before and after the adsorption of as _ (+) _ (V).The main components of the active ferromanganese oxide film before adsorption are Fe and mn, and there is arsenic after adsorption, which indicates that it has the ability to remove arsenic.In terms of structure, the crystal structure before and after adsorption is basically unchanged, and the active ferromanganese oxide film forms a new As-O bond after adsorption.The active ferromanganese oxide film is a homogeneous adsorbent with large saturated adsorption capacity and fast adsorption process. It is chemically adsorbed and the diffusion in particles is not the only step to control the adsorption process.Both the surface potential and the adsorption capacity of active ferromanganese oxide films decreased with the increase of pH value, and the coexistence of CO _ 3O _ 2) significantly inhibited the adsorption of arsenic removal from active ferromanganese oxide films.With the addition of active ferromanganese oxide film, the removal rate of arsenic oxide increases and the adsorption capacity decreases.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU991.2

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本文編號(hào)：1767376