| 天然沸石去除地下水中氨氮的研究 |
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| 引用本文： | 陈坚,黄国鑫,刘菲,秦晓鹏,辛晓华,金爱芳.天然沸石去除地下水中氨氮的研究[J].安徽农业科学,2011(10):6020-6022,6033. |
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| 作者姓名： | 陈坚 黄国鑫 刘菲 秦晓鹏 辛晓华 金爱芳 |
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| 作者单位： | 中国地质大学(北京)水资源与环境工程北京市重点实验室 |
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| 基金项目： | 国家水体污染控制与治理重大专项(2009ZX07424-002,2009-ZX07212-003);国家自然科学基金项目(40972162) |
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| 摘 要： | 针对地下水中氨氮（NH4-N）污染,采用天然沸石进行了试验研究,探讨了沸石种类、振荡强度、pH、吸附等温线等因素对去除地下水中氨氮的影响。结果表明,天然沸石对NH4-N具有＂快速吸附、缓慢平衡＂的特点,浙江缙云沸石对地下水中NH4-N具有较好的去除能力。当反应时间≤3 h,高振荡强度（200 r/min）的NH4-N去除率大于低振荡强度（100 r/min）的;振荡强度显著影响NH4-N的去除效果。当pH介于2.59～10.66时,去除率为74.23%～93.71%。中性初始pH（5.76～8.55）利于NH4-N的吸附去除,酸性（pH≤2.59）导致去除率略有下降,而碱性（pH≥10.66）致使去除率急剧下降。缙云沸石的Langmiur吸附等温公式为：Q=0.964 8μ/（1＋0.181 0μ）,而Freundlich吸附公式为：Q=0.815 8μ0.5762,推荐采用后者。
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| 关 键 词： | 天然沸石 氨氮 地下水 沸石种类 振荡强度 pH 吸附等温线 |
Study on Removal of Ammonium-Nitrogen in Groundwater by Natural Zeolites |
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| Institution: | CHEN Jian et al(Beijing Key Laboratory of Water Resources & Environmental Engineering,China University of Geosciences(Beijing),Beijing 100083) |
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| Abstract: | An experiment was carried out by using natural zeolites to deal with the NH4-N contamination in groundwater.The effects of zeolite type,vibration intensity,pH and adsorption isotherm curve on the removal effect of NH4-N were investigated.As indicated by the experimental results,NH4-N adsorption by natural zeolites was characterized by "fast adsorption and slow equilibration",and the zeolites in Jinyun of Zhejiang Province showed the excellent performance for NH4-N removal.The removal efficiency at high vibration intensity(200 r/min) was greater than that of low intensity(100 r/min) at reaction time ≤3 h,NH4-N removal efficiency was significantly influenced by the vibration intensity.The removal efficiency ranged from 74.23% to 93.71% at the pH of 2.59-10.66.The neutral pH(5.76-8.55) could promote NH4-N adsorption removal;the acidic pH value(pH≤2.59) caused a slight decrease in removal efficiency;however,the alk pH value(pH≥10.66) led to a sharp decrease in the removal efficiency.Langmiur adsorption isotherm curve of Jinyun zeolite was Q=0.964 8 μ/(1+0.181 0 μ),and its Freundlich adsorption isotherm curve was Q=0.815 8 μ0.576 2.The latter is recommended. |
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| Keywords: | Natural zeolites Ammonium-nitrogen(NH4-N) Groundwater Zeolite type Vibration intensity pH Adsorption isotherm curve |
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