發(fā)布時(shí)間：2018-04-18 15:23

  本文選題：地下水 + 氨氮�。� 參考：《西安建筑科技大學(xué)》2015年碩士論文

【摘要】：鐵、錳、氨氮通常伴生存在于地下水中,使得以地下水為飲用水水源的地區(qū)必須采取有效方法將其去除。接觸氧化法廣泛應(yīng)用于地下水同步去除鐵、錳、氨氮污染物,但該法活性濾膜成熟所需時(shí)間較長(zhǎng),啟動(dòng)速度慢。采用“氧化+過(guò)濾”工藝能夠有效解決啟動(dòng)速度慢的問(wèn)題,即通過(guò)強(qiáng)氧化劑高錳酸鉀的氧化,將Fe2+氧化為Fe3+,并以Fe(OH)3形式析出,將Mn2+氧化成MnO2,再經(jīng)過(guò)濾將其截留在濾料表面形成活性濾膜。本文采用高錳酸鉀氧化使接觸氧化濾池快速啟動(dòng),濾料掛膜成熟后,進(jìn)行同步去除地下水中鐵、錳、氨氮污染物及其相互作用的研究,具體包括以下三方面的研究:1)在鐵錳投加量一致,即相同時(shí)間進(jìn)入濾池的鐵錳總量相同,采用不同濾速進(jìn)行活性濾膜的培養(yǎng),并以濾池出水作為循環(huán)進(jìn)水;2)保持濾速一致,進(jìn)水鐵和氨氮濃度相同,考察不同錳濃度對(duì)濾池啟動(dòng)周期的影響;3)經(jīng)掛膜形成的活性濾料進(jìn)行同步去除地下水中鐵錳氨氮,考察其去除效果以及相互作用。實(shí)驗(yàn)結(jié)果如下:1.結(jié)合兩次掛膜實(shí)驗(yàn),在所考察的掛膜實(shí)驗(yàn)條件下,最佳進(jìn)水鐵、錳、氨氮的濃度分別為0.1~1mg/L、0.1~4mg/L、0.5~1.5mg/L。2.傳質(zhì)過(guò)程是影響濾料掛膜期間去除氨氮的限制步驟,掛膜過(guò)程中增大進(jìn)水氨氮濃度,氨氮的去除量隨之提高。3.濾料形成穩(wěn)定除錳能力與掛膜期間進(jìn)水錳濃度具有正相關(guān)性,在所考察的錳濃度范圍內(nèi),進(jìn)水錳濃度越高,除錳能力越強(qiáng)。4.濾料除錳所需的濾層厚度可以作為判定濾料是否具備穩(wěn)定除錳能力的依據(jù)。5.接觸催化氧化濾池可以實(shí)現(xiàn)對(duì)地下水中氨氮、鐵、錳的同步去除,對(duì)三種污染物的最快去除速率均在0~40cm濾層,去除氨氮所需濾層厚度較鐵、錳高。6.錳的氧化過(guò)程可能誘導(dǎo)氨氮氧化,發(fā)生“誘導(dǎo)氧化反應(yīng)”,錳對(duì)石英砂接觸催化氧化氨氮過(guò)程起主要作用,錳能夠強(qiáng)化石英砂表面濾膜的活性,從而使得整個(gè)濾層對(duì)氨氮都具有較高的去除速率,進(jìn)而提高了氨氮的去除量。因此,根據(jù)原水氨氮濃度試驗(yàn)出最適宜的錳濃度對(duì)提高接觸催化氧化工藝最大去除能力具有重要意義。
[Abstract]:Iron, manganese and ammonia nitrogen are usually associated with groundwater, which makes it necessary to take effective measures to remove them in areas where groundwater is the source of drinking water.Contact oxidation is widely used in the simultaneous removal of iron, manganese and ammonia nitrogen pollutants from groundwater, but it takes a long time to mature the active filter membrane and the start-up speed is slow.The process of "oxidation filtration" can effectively solve the problem of slow starting speed, that is, Fe2 is oxidized to Fe3 through the oxidation of strong oxidizer potassium permanganate and precipitated in the form of Fe(OH)3.Mn2 was oxidized to MNO _ 2 and then filtered to form active filter membrane on the surface of filter media.In this paper, potassium permanganate oxidation is used to make contact oxidation filter to start up quickly. After the maturation of filter media membrane, the simultaneous removal of iron, manganese and ammonia nitrogen pollutants from groundwater and their interactions are studied.The specific research includes the following three aspects: (1) the amount of iron and manganese added in the filter is the same, that is, the total amount of iron and manganese entering the filter tank is the same at the same time, the active filter membrane is cultured at different filtration rates, and the filter effluent is used as the circulating influent 2) to maintain the same filtration rate.The influent iron and ammonia nitrogen concentration were the same. The effect of different manganese concentration on the start-up cycle of filter tank was investigated. 3) the active filter media formed by hanging membrane was used to simultaneously remove iron and manganese ammonia nitrogen from groundwater, and its removal efficiency and interaction were investigated.The results of the experiment are as follows: 1.Under the experimental conditions, the optimum influent concentrations of iron, manganese and ammonia nitrogen were 0.1 mg / L 0.1 mg / L 0.1 mg / L 0.1 mg / L 0. 5 mg / L 0. 5 mg / L -1. 2 mg / L. 2, respectively.The mass transfer process is the limiting step to remove ammonia nitrogen during the membrane suspension period, and the ammonia nitrogen removal amount increases with the increase of the influent ammonia nitrogen concentration during the membrane suspension process.The stable manganese removal capacity of filter media was positively correlated with the influent manganese concentration during the period of membrane suspension. In the range of manganese concentration investigated, the higher the influent manganese concentration was, the stronger the manganese removal capacity was. 4.The thickness of filter layer needed for removing manganese from filter media can be used as the basis for determining whether the filter material has the ability to remove manganese stably.The contact catalytic oxidation filter can realize simultaneous removal of ammonia nitrogen, iron and manganese in groundwater. The fastest removal rate of the three pollutants is in the 0~40cm filter layer. The thickness of the filter layer required for ammonia nitrogen removal is higher than that of iron, and manganese is higher.The oxidation process of manganese may induce the oxidation of ammonia nitrogen and "induced oxidation reaction". Manganese plays a major role in the process of catalytic oxidation of ammonia nitrogen by contact with quartz sand. Manganese can enhance the activity of filter membrane on quartz sand surface.Thus, the ammonia nitrogen removal rate is higher in the whole filter layer, and the ammonia nitrogen removal rate is improved.Therefore, according to the ammonia nitrogen concentration of raw water, the most suitable manganese concentration is very important to improve the maximum removal capacity of contact catalytic oxidation process.
【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】：2015
【分類號(hào)】：X523

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