Study Of Enhancing Removal High Concentration Ammonium And Manganese From Surface Water By Oxygenating In Reverse Flow

Nitrogen is one of the main pollutants in water source pollution.With the expansion of population base,production,development and construction,water resources are constantly threatened by ammonia nitrogen and manganese.When the concentration is too high,it will do great harm to human health and safety,as well as the smooth progress of industrial production.When manganese element exceeds the upper limit of human body,it will cause a great burden on organs and nervous system.Meanwhile,manganese is one of the main causes of bacteria proliferation,which will lead to pipeline corrosion,.When the content of ammonia nitrogen in water is too high,the phenomenon of excessive consumption of dissolved oxygen will appear,which will affect the growth of aquatic animals and plants,and ammonia nitrogen is toxic in water.Therefore,it is urgent to develop a process which can remove ammonia nitrogen and manganese simultaneously and efficiently.In this project,quartz sand is prepared into a kind of iron manganese composite oxide membrane filter material with the activity of catalytic oxidation to remove ammonia nitrogen and manganese from water,which has the characteristics of high efficiency,safety and stability.At present,it has been successfully used in groundwater treatment projects.Due to the fluctuation of pollutant concentration in surface water and its seasonality,the application of composite iron manganese oxide film in surface water still needs to be studied.In this paper,based on the existing research,using the counter current oxygen charging equipment,the key substance dissolved oxygen for ammonia nitrogen and manganese removal is supplemented,and the removal effect of iron manganese composite oxide film is strengthened.The problem of poor activity at low temperature is overcome,and the influencing factors of simultaneous removal of ammonia nitrogen and manganese under the condition of oxygen charging are explored.On this basis,this set of equipment is applied to the ammonia nitrogen treatment of surface water in South China in order to improve the adaptability of composite manganese oxide membrane filter material in surface water and optimize the treatment effect of manganese in surface water,so as to guide the engineering practice.The main conclusions of this paper are as follows:(1)The removal of ammonia nitrogen and manganese from high concentration surface water was enhanced by countercurrent oxygenation at low temperature.The experimental results show that the difference of temperature greatly affects the performance of simultaneous removal of ammonia nitrogen and manganese by iron manganese composite oxide film.Keeping the best oxygen charge can make the dissolved oxygen in water sufficient without stirring the filter layer,and improve the removal efficiency of ammonia nitrogen and manganese to a great extent.On this basis,reducing the filtration rate is helpful to improve the removal efficiency,and the high concentration of influent ammonia nitrogen and manganese will inhibit each other.(2)The factors influencing the enhanced removal of high concentration ammonia nitrogen / manganese from surface water under the condition of non countercurrent oxygenation were studied.The experimental results show that the removal effect of oxide film is significantly enhanced at 21 ? compared with that at low temperature,and the removal effect is significantly enhanced after oxygenation.When the oxygenation position is selected at the bottom 1/3,the oxygenation efficiency is the largest;the increase of TOC concentration in the influent can inhibit the simultaneous removal of ammonia nitrogen and manganese.The analysis results of the characterization of the filter material show that there is no structural change in the filter material The organic matters attached to the filter material inhibit the combination of ammonia nitrogen,manganese and filter material.(3)Compared with that in May and June in the south of China(water temperature 20-22 ?),the removal difference of ammonia nitrogen by composite iron manganese oxide film under different water quality in the north and south of China was compared,and the removal of ammonia nitrogen was strengthened by countercurrent oxygenation,and a series of factors affecting the removal were explored.The experimental results show that for every 1mg/L ammonia nitrogen removed from surface water in South China,2.9 mg/L dissolved oxygen needs to be consumed,which is less than that in North China.Under the condition of oxygen filling,the oxide film can completely treat 3.5 mg/L ammonia nitrogen,and run at the oxygen filling intensity of 0.4,0.5,0.6 and 0.7ml/cm2·min,respectively.The utilization ratio of oxygen in the film is 47.2%,41.2%,45.9% and 39.3% respectively,which is lower than that in the north.With the increase of oxygen filling intensity,the removal rate of ammonia nitrogen from surface water in North China is faster...