不同離子對鐵錳氧化物催化氧化去除地下水中氨氮的影響
發(fā)布時間：2018-11-20 19:48
【摘要】：近年來,由于環(huán)境污染,地下水氨氮超標的現(xiàn)象越來越普遍。研究證明鐵錳氧化物催化氧化地下水中氨氮相較于生物法具有濾料成熟期短,能夠同步去除鐵錳等多種污染物等優(yōu)點。但由于我國幅員遼闊,地下水水質(zhì)變化很大,鐵錳氧化物催化氧化氨氮這種技術(shù)在其他地區(qū)的應用可能會出現(xiàn)新的問題,為了進一步完善鐵錳氧化物催化氧化氨氮的理論,本實驗主要研究內(nèi)容為不同離子對鐵錳氧化物催化氧化去除地下水中氨氮的影響。實驗利用已持續(xù)運行2年的石英砂濾柱中試系統(tǒng),通過改變進水中不同離子的種類和離子濃度,考察了不同濃度離子對石英砂濾料表面活性氧化膜催化氧化水中氨氮性能的影響。結(jié)果表明:高濃度鈉離子、鉀離子、氯離子、硫酸根離子、碳酸氫根離子對濾料去除氨氮性能基本沒有影響,去除率均達到了87%以上。高濃度鈣離子對濾料去除氨氮性能影響很大,當氯化鈣進水濃度為1000 mg/L,去除率降低到了51%。停止投加鈣離子后,濾料去除氨氮的性能可在8~9 h內(nèi)恢復。對濾料表面進行微觀表征發(fā)現(xiàn)濾料表面鈣的含量大幅上升,濾料的比表面積、孔體積降低,影響了濾料與氨氮污染物的接觸,造成氨氮去除效率下降。亞鐵離子和錳離子對氨氮去除性能的影響很大,當進水中亞鐵離子濃度為10 mg/L,去除率降低到了65%。隨著進水中亞鐵離子濃度的升高,出水中硝氮濃度降低,亞硝氮濃度增加。進水中較高濃度的錳離子會影響鐵錳氧化膜對氨氮的去除效果,進水中錳離子濃度超過4 mg/L以上時,氨氮去除率為81%。進水中同時投加錳離子和亞鐵離子時,亞鐵離子對鐵錳氧化膜去除氨氮的影響要比錳離子明顯很多,進水中亞鐵離子濃度越高,錳離子對鐵錳氧化膜去除氨氮的影響越不明顯。
[Abstract]:In recent years, due to environmental pollution, the phenomenon of groundwater ammonia nitrogen exceeding the standard is becoming more and more common. It has been proved that the ammonia nitrogen in groundwater catalyzed by iron and manganese oxides has the advantages of shorter maturation period and more simultaneous removal of iron and manganese and other pollutants. However, due to the vast territory of our country and the great changes in groundwater quality, the application of the technology of iron and manganese oxide catalytic oxidation of ammonia nitrogen in other regions may lead to new problems. In order to further improve the theory of iron and manganese oxide catalytic oxidation of ammonia nitrogen, The effect of different ions on the removal of ammonia nitrogen from groundwater by catalytic oxidation of iron and manganese oxide was studied in this experiment. The pilot system of quartz sand filter column, which has been running for 2 years, was used to change the species and concentration of different ions in the influent. The effects of different concentrations of ions on the catalytic oxidation of ammonia and nitrogen in water by surface active oxide film of quartz sand filter were investigated. The results showed that high concentration of sodium ion, potassium ion, chloride ion, sulfate ion and bicarbonate ion had no effect on the removal of ammonia and nitrogen, and the removal rate was over 87%. The high concentration of calcium ion has a great effect on the removal of ammonia and nitrogen, and the removal rate of calcium chloride decreases to 51 when the influent concentration of calcium chloride is 1000 mg/L,. After the addition of calcium ion was stopped, the performance of ammonia nitrogen removal could be recovered in 8 ~ 9 h. Microscopic characterization of the surface of the filter media found that the calcium content on the surface of the filter media increased significantly, and the specific surface area and pore volume of the filter media decreased, which affected the contact between the filter media and ammonia nitrogen pollutants, resulting in a decrease in the removal efficiency of ammonia nitrogen. The effect of ferrous ion and manganese ion on the removal performance of ammonia nitrogen was very great. When the concentration of ferrous ion in influent was 10 mg/L, the removal rate decreased to 65%. With the increase of the iron ion concentration in the influent, the nitrate concentration in the effluent decreased and the nitrite nitrogen concentration increased. The high concentration of manganese ion in the influent will affect the removal effect of ammonia nitrogen by ferromanganese oxide film. When the concentration of manganese ion in the influent is more than 4 mg/L, the removal rate of ammonia nitrogen is 81%. When both mn and Fe ions were added into the influent, the effect of ferrous ion on the removal of ammonia nitrogen by ferromanganese oxide film was more obvious than that by manganese ion. The higher the concentration of ferrous ion in influent, the less the effect of manganese ion on the removal of ammonia nitrogen in ferromanganese oxide film.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X523
本文編號：2345821
[Abstract]:In recent years, due to environmental pollution, the phenomenon of groundwater ammonia nitrogen exceeding the standard is becoming more and more common. It has been proved that the ammonia nitrogen in groundwater catalyzed by iron and manganese oxides has the advantages of shorter maturation period and more simultaneous removal of iron and manganese and other pollutants. However, due to the vast territory of our country and the great changes in groundwater quality, the application of the technology of iron and manganese oxide catalytic oxidation of ammonia nitrogen in other regions may lead to new problems. In order to further improve the theory of iron and manganese oxide catalytic oxidation of ammonia nitrogen, The effect of different ions on the removal of ammonia nitrogen from groundwater by catalytic oxidation of iron and manganese oxide was studied in this experiment. The pilot system of quartz sand filter column, which has been running for 2 years, was used to change the species and concentration of different ions in the influent. The effects of different concentrations of ions on the catalytic oxidation of ammonia and nitrogen in water by surface active oxide film of quartz sand filter were investigated. The results showed that high concentration of sodium ion, potassium ion, chloride ion, sulfate ion and bicarbonate ion had no effect on the removal of ammonia and nitrogen, and the removal rate was over 87%. The high concentration of calcium ion has a great effect on the removal of ammonia and nitrogen, and the removal rate of calcium chloride decreases to 51 when the influent concentration of calcium chloride is 1000 mg/L,. After the addition of calcium ion was stopped, the performance of ammonia nitrogen removal could be recovered in 8 ~ 9 h. Microscopic characterization of the surface of the filter media found that the calcium content on the surface of the filter media increased significantly, and the specific surface area and pore volume of the filter media decreased, which affected the contact between the filter media and ammonia nitrogen pollutants, resulting in a decrease in the removal efficiency of ammonia nitrogen. The effect of ferrous ion and manganese ion on the removal performance of ammonia nitrogen was very great. When the concentration of ferrous ion in influent was 10 mg/L, the removal rate decreased to 65%. With the increase of the iron ion concentration in the influent, the nitrate concentration in the effluent decreased and the nitrite nitrogen concentration increased. The high concentration of manganese ion in the influent will affect the removal effect of ammonia nitrogen by ferromanganese oxide film. When the concentration of manganese ion in the influent is more than 4 mg/L, the removal rate of ammonia nitrogen is 81%. When both mn and Fe ions were added into the influent, the effect of ferrous ion on the removal of ammonia nitrogen by ferromanganese oxide film was more obvious than that by manganese ion. The higher the concentration of ferrous ion in influent, the less the effect of manganese ion on the removal of ammonia nitrogen in ferromanganese oxide film.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X523
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