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29种湿地填料对氨氮的吸附解吸性能比较

卢少勇 万正芬 李锋民 张学庆

卢少勇, 万正芬, 李锋民, 张学庆. 29种湿地填料对氨氮的吸附解吸性能比较[J]. 环境科学研究, 2016, 29(8): 1187-1194.
引用本文: 卢少勇, 万正芬, 李锋民, 张学庆. 29种湿地填料对氨氮的吸附解吸性能比较[J]. 环境科学研究, 2016, 29(8): 1187-1194.
LU Shaoyong, WAN Zhengfen, LI Fengmin, ZHANG Xueqing. Ammonia Nitrogen Adsorption and Desorption Characteristics of Twenty-Nine Kinds of Constructed Wetland Substrates[J]. Research of Environmental Sciences, 2016, 29(8): 1187-1194.
Citation: LU Shaoyong, WAN Zhengfen, LI Fengmin, ZHANG Xueqing. Ammonia Nitrogen Adsorption and Desorption Characteristics of Twenty-Nine Kinds of Constructed Wetland Substrates[J]. Research of Environmental Sciences, 2016, 29(8): 1187-1194.

29种湿地填料对氨氮的吸附解吸性能比较

基金项目: 国家水体污染控制与治理科技重大专项(2012ZX07105-002);中央级公益性科研院所基本科研业务专项(2012-YSKY-14);国家自然科学基金项目(41373027)

Ammonia Nitrogen Adsorption and Desorption Characteristics of Twenty-Nine Kinds of Constructed Wetland Substrates

  • 摘要: 为筛选出性能更好的人工湿地填料,采用等温吸附-解吸试验,测定了29种天然和非天然人工湿地填料的孔隙率、渗透系数及其对NH3-N的吸附-解吸特性. 结果表明:锯末、瓷砖、鸡蛋壳、瓷砂陶粒、火山岩等材料的孔隙率较大,瓷砂陶粒、海绵铁、石灰石、页岩陶粒、砾石等材料的渗透系数较大;Freundlich和Langmuir等温吸附方程能较好地拟合各填料对NH3-N的吸附特征,通过Langmuir等温吸附方程计算,对NH3-N的理论饱和吸附量居前5位的填料依次是火山岩(1.700 0 mg/g)、瓷砂陶粒(1.620 0 mg/g)、生物炭(1.353 0 mg/g)、沸石(1.350 0 mg/g)、石榴石(1.190 0 mg/g). 吸附速率的变化与填料吸附NH3-N的途径密切相关. 吸附饱和的生物炭、焦炭、大理黏土、沸石、磁铁矿、石英砂主要通过离子交换作用吸附NH3-N,稳定性好,解吸率均小于20%;瓷砂陶粒和火山岩对NH3-N的解吸率分别为24.50%和35.51%,既有物理吸附也有离子交换作用. 火山岩、瓷砂陶粒、生物炭、沸石对较高浓度NH3-N的吸附效果较好. 研究显示,火山岩、生物炭、瓷砂陶粒、沸石等适合作为人工湿地中吸附NH3-N的填料.

     

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  • 收稿日期:  2015-12-20
  • 修回日期:  2016-04-11
  • 刊出日期:  2016-08-25

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