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潮汐流人工湿地的除氮效果及影响因素

张亚琼 崔丽娟 李 伟 李 凯

张亚琼, 崔丽娟, 李 伟, 李 凯. 潮汐流人工湿地的除氮效果及影响因素[J]. 环境科学研究, 2015, 28(7): 1172-1178.
引用本文: 张亚琼, 崔丽娟, 李 伟, 李 凯. 潮汐流人工湿地的除氮效果及影响因素[J]. 环境科学研究, 2015, 28(7): 1172-1178.
ZHANG Yaqiong, CUI Lijuan, LI Wei, LI Kai. Depth Variations and Factors Influencing Nitrogen Removal in Tidal Flow Constructed Wetlands[J]. Research of Environmental Sciences, 2015, 28(7): 1172-1178.
Citation: ZHANG Yaqiong, CUI Lijuan, LI Wei, LI Kai. Depth Variations and Factors Influencing Nitrogen Removal in Tidal Flow Constructed Wetlands[J]. Research of Environmental Sciences, 2015, 28(7): 1172-1178.

潮汐流人工湿地的除氮效果及影响因素

基金项目: 中央级公益性科研院所基本科研业务专项(CAFYBB2014QA029,CAFINT2013C13)

Depth Variations and Factors Influencing Nitrogen Removal in Tidal Flow Constructed Wetlands

  • 摘要: 为研究TF-CW(tidal flow constructed wetland,潮汐流人工湿地)的除氮效果及其主要影响因素,以连续流模拟装置(A组)为对照,设置3种潮汐进水方式〔RAT(闲置时间∶反应时间)分别为1∶1、1∶2、2∶1,依次记做B组、C组、D组〕,运行175 d,分析不同进水方式下TF-CW模拟装置对TN、NH4+-N、NO3--N、TOC的去除效果及其在不同处理深度上的变化. 结果表明:A、B、C、D组TN平均去除率分别为82.41%±4.84%、84.82%±5.09%、86.09%±3.99%、90.23%±3.05%. A组TN和NH4+-N的去除效果与B、C、D组均差异显著(P<0.05),其中D组TN和NH4+-N的去除效果均最好;A组对NO3--N的总体去除效果较优;RAT并不影响TOC的去除率. 不同进水方式下,NH4+-N的去除率均在0~15 cm深度内最大,ρ(TOC)处于较低水平(0~20 mg/L),二者均随处理深度的不断增加而逐渐下降;ρ(NO3--N)在0~15 cm深度内迅速上升. 随着闲置时间的增加,ρ(DO)逐渐升高. TN和NH4+-N的去除率随着运行时间的增加基本保持恒定,主要影响因子有ρ(DO)、RAT、ORP(oxidation reduction potential,氧化还原电位)和ρ(TOC);而NO3--N的去除率随着运行时间的增加而逐渐降低,其主要影响因子有pH、电导率和水温等.

     

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