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《Journal of Anhui Agricultural Sciences》 2011-10
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Study on Removal of Ammonium-Nitrogen in Groundwater by Natural Zeolites

CHEN Jian et al(Beijing Key Laboratory of Water Resources & Environmental Engineering,China University of Geosciences(Beijing),Beijing 100083)  
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.
【Fund】: 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)
【CateGory Index】: X523
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