| 城市重污染河道环境因子对底质氮释放影响 |
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| 引用本文： | 邢雅囡,阮晓红,赵振华.城市重污染河道环境因子对底质氮释放影响[J].水科学进展,2010,21(1):120-126. |
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| 作者姓名： | 邢雅囡 阮晓红 赵振华 |
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| 作者单位： | 1.河海大学环境科学与工程学院, 江苏, 南京, 210098; |
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| 基金项目： | 国家自然科学基金资助项目，国家水体污染控制与治理科技重大专项 |
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| 摘 要： | 以苏州市古城区劣Ⅴ类水体为研究对象,利用模拟试验方法,研究和探讨了水体环境条件(DO、Eh、pH值、温度)变化和疏浚深度对河道底泥氮释放的影响.底泥供试样中NH4+-N与NO3--N含量一般为0.277 g/kg与0.0012g/kg,上覆水体NH4+-N与NO3--N含量一般为6.743 mg/L与1.500 mg/L.试验结果表明:厌氧环境(DO<0.5 mg/L)、强还原环境(Eh<-108 mV)、酸性环境(pH<6.0)及温度升高均有利于底泥中NH4+-N的释放,NO3--N的迁移转化规律则相反;供试样控制疏浚深度5 cm、10 cm、15 cm、20 cm,当疏浚深度15 cm时,泥-水界面向上覆水体中扩散的氮通量最小;疏浚深度、DO和Eh对底泥NH4+-N释放程度的影响大于pH和温度,通过曝气等方式保持水体中适当的溶解氧或使底泥保持较强的氧化电位环境可以有效抑制底泥中NH4+-N的释放.
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| 关 键 词： | 底泥 氮释放 环境因子 主控因子 |
| 收稿时间： | 2008-10-22 |
Effect of environmental changes on nitrogen release from sediments in polluted urban river |
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| XING Ya-nan,RUAN Xiao-hong,ZHAO Zhen-hua.Effect of environmental changes on nitrogen release from sediments in polluted urban river[J].Advances in Water Science,2010,21(1):120-126. |
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| Authors: | XING Ya-nan RUAN Xiao-hong ZHAO Zhen-hua |
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| Institution: | 1.College of Environmental Science and Engineering, Hohai University, Nanjing 210098, China;2.Department of Hydrosciences, Nanjing University, Nanjing 210093, China |
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| Abstract: | Water and sediment samples were collected from a polluted river in the old town of Suzhou City.The water in the river is classified as poor quality V according to the National Surface Water Quality Standard of China.We examine the regularity of nitrogen release from sediments under different environmental conditions such as the dissolved oxygen(DO) level,the redox potential status measured as Eh level,the pH value,the temperature,and the dredging depth,using the indoor experimental method.The results show t... |
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| Keywords: | sediments release of nitride environmental condition main control factors |
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