接触氧化滤池处理含铁锰氨氮地下水的快速启动与处理效果

发布时间：2018-04-18 15:23

本文选题：地下水 + 氨氮　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：铁、锰、氨氮通常伴生存在于地下水中,使得以地下水为饮用水水源的地区必须采取有效方法将其去除。接触氧化法广泛应用于地下水同步去除铁、锰、氨氮污染物,但该法活性滤膜成熟所需时间较长,启动速度慢。采用“氧化+过滤”工艺能够有效解决启动速度慢的问题,即通过强氧化剂高锰酸钾的氧化,将Fe2+氧化为Fe3+,并以Fe(OH)3形式析出,将Mn2+氧化成MnO2,再经过滤将其截留在滤料表面形成活性滤膜。本文采用高锰酸钾氧化使接触氧化滤池快速启动,滤料挂膜成熟后,进行同步去除地下水中铁、锰、氨氮污染物及其相互作用的研究,具体包括以下三方面的研究:1)在铁锰投加量一致,即相同时间进入滤池的铁锰总量相同,采用不同滤速进行活性滤膜的培养,并以滤池出水作为循环进水;2)保持滤速一致,进水铁和氨氮浓度相同,考察不同锰浓度对滤池启动周期的影响;3)经挂膜形成的活性滤料进行同步去除地下水中铁锰氨氮,考察其去除效果以及相互作用。实验结果如下:1.结合两次挂膜实验,在所考察的挂膜实验条件下,最佳进水铁、锰、氨氮的浓度分别为0.1~1mg/L、0.1~4mg/L、0.5~1.5mg/L。2.传质过程是影响滤料挂膜期间去除氨氮的限制步骤,挂膜过程中增大进水氨氮浓度,氨氮的去除量随之提高。3.滤料形成稳定除锰能力与挂膜期间进水锰浓度具有正相关性,在所考察的锰浓度范围内,进水锰浓度越高,除锰能力越强。4.滤料除锰所需的滤层厚度可以作为判定滤料是否具备稳定除锰能力的依据。5.接触催化氧化滤池可以实现对地下水中氨氮、铁、锰的同步去除,对三种污染物的最快去除速率均在0~40cm滤层,去除氨氮所需滤层厚度较铁、锰高。6.锰的氧化过程可能诱导氨氮氧化,发生“诱导氧化反应”,锰对石英砂接触催化氧化氨氮过程起主要作用,锰能够强化石英砂表面滤膜的活性,从而使得整个滤层对氨氮都具有较高的去除速率,进而提高了氨氮的去除量。因此,根据原水氨氮浓度试验出最适宜的锰浓度对提高接触催化氧化工艺最大去除能力具有重要意义。
[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.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X523

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