| 不同铁锰浓度的低温铁锰氨地下水净化中氨氮去除途径 |
| 摘要点击 1356 全文点击 492 投稿时间：2019-12-16 修订日期：2019-12-28 |
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| 中文关键词 低温 亚铁 锰 氨氮 吸附 硝化 |
| 英文关键词 low temperature ferrous manganese ammonia nitrogen adsorption nitrification |
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| 中文摘要 |
| 在某地下水除铁锰氨氮水厂，以中试滤柱开展了低温（5~6℃）、铁锰氨[Fe（Ⅱ）0~19.26 mg·L-1、Mn（Ⅱ）0.52~2.05 mg·L-1和NH4+-N 0.37~2.59 mg·L-1]净化工艺实验研究，探究了不同铁锰浓度时氨氮的去除途径.结果表明，当保持进水锰浓度约为0.6 mg·L-1，提高进水亚铁浓度时，随着滤层中铁氧化物的增加，通过铁氧化物吸附去除的氨氮比例会升高，通过硝化作用去除的氨氮比例会降低，且吸附作用先于硝化作用.当保持进水亚铁浓度分别约为8 mg·L-1和11 mg·L-1，提高进水锰浓度时，通过吸附去除的氨氮比例并没有随着锰氧化物的增加而增加，即氨氮的去除途径几乎未发生改变.其原因是，在滤层前20 cm形成的锰氧化物较少，对此范围内吸附的氨氮影响较小，锰氧化物的生成区域集中在滤层的20 cm以下，而绝大部分氨氮在该区域之前已经通过吸附和硝化作用去除，该区域中的锰氧化物并没有吸附氨氮. |
| 英文摘要 |
| In a groundwater plant, removal of iron, manganese, and ammonia nitrogen was performed via a purification process using a filter column at a low temperature (5-6℃). Iron, manganese and ammonia [Fe(Ⅱ) 0-19.26 mg·L-1, Mn(Ⅱ) 0.52-2.05 mg·L-1, and NH4+-N 0.37-2.59 mg·L-1] were analyzed to explore the ammonia nitrogen removal efficiency under different iron and manganese concentrations. The results showed that when the concentration of manganese in the inlet water was maintained at approximately 0.6 mg·L-1 and the concentration of ferrous iron in the inlet water was increased, with the increase of iron oxides in the filter layer, the ratio of ammonia nitrogen removed by adsorption of iron oxides increased, while the ratio of ammonia nitrogen removed by nitrification will decreased and adsorption preceded nitrification. When the concentration of ferrous iron in the water was maintained at approximately 8 mg·L-1and 11 mg·L-1, and the concentration of manganese in the water was increased, the proportion of ammonia nitrogen removed by adsorption did not increase with the increase of manganese oxide, and the removal route of ammonia nitrogen hardly changed. This is because less manganese oxides were formed 20 cm before the filter layer, which had little effect on the ammonia nitrogen adsorbed in this range. The production area of manganese oxides was concentrated below 20 cm of the filter layer, and most ammonia nitrogen was removed by adsorption and nitrification before this area, and the manganese oxides in this area did not adsorb ammonia nitrogen. |
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