The Study On Quick Start And Treatment Effect Of Removing Iron, Manganese And Ammonia In Contact Oxidation Filter

Iron, manganese and ammonia nitrogen is usually associated exists in groundwater, enables the groundwater for drinking water sources area must take effective methods to remove. Contact oxidation method is widely applied in groundwater synchronously to remove iron, manganese and ammonia nitrogen pollutants, but the active membrane maturity required for a long time, start slowly. Using oxidation + filtration can solve the problem of slow start. Through strong oxidant potassium permanganate oxidation, make the Fe2+ oxidation into Fe3+, and by Fe(OH)3 form precipitate, make the Mn2+ oxidation into Mn O2, then through filter to separate the intercept.In this paper, through potassium permanganate membrane run quick start filter, when filter material hanging membrane after maturity, the research of simultaneous removal of ammonia, iron and manganese from groundwater and their interaction will beginning. 1) In iron and manganese dosing quantity, it means that the total iron and manganese has the same amount of filter in the same time, using different filtration velocity to the cultivation of the active filter membrane, and effluent water of filter as the circulating water. 2) Keep the filter speed consistent, the concentration of iron and ammonia intake is the same, studying the effect of different manganese concentration on the filter to start the cycle. 3) The study on simultaneous removal iron, manganese and ammonia from groundwater after formation of the active filter material through hanging membrane, investigate its removal effect and interaction. The experimental results are as follows: 1 Combining two hanging film experiment, in the investigation of membrane under the experimental conditions, the best water of iron, manganese and ammonia concentration were 0.1~1mg/L, 0.1~4mg/L, 0.5~1.5mg/L. 2 Mass transfer process of filter material of removing ammonia nitrogen limiting steps during hang membrane, hanging membrane process, increase the water ammonia nitrogen concentration in the amount of ammonia nitrogen removal. 3 Filter material to form stable during the manganese removal ability and hanged membrane water manganese concentration has a positive correlation, in the investigation of manganese concentration range, the higher concentration of manganese, the higher manganese removal ability. 4 The layer thickness need for filter material remove manganese can be used as to decide if the basic of a stable manganese removal ability. 5 Removal iron, manganese and ammonia at same layer from groundwater can be accomplished by the contact catalytic oxidation filter column, the fastest removal rate layer of three kinds of pollutant are in 0-40 cm, the thickness of filter layer needed to remove ammonia nitrogen is relatively higher than iron and manganese. 6 The oxidation process of Mn2+ may induce NH4+-N oxidation, happened ‘induced oxidation reaction’, Mn2+ plays a main role in catalytic oxidation NH4+-N, Mn2+ could strengthen the activity of quartz sand surface membrane filter, to make the whole filter layer has higher removal rate of ammonia nitrogen, then increase the amount of NH4+-N removal. Therefore, according to the raw water concentration of NH4+-N is testing out the most suitable concentration of Mn2+ catalytic oxidation process to improve the contact biggest removal ability is of great significance.