Diffusion of nitrate nitrogen in sediment of stream segment of Fuyang River through Hengshui City

doi:10.3969/j.issn.1000-1565.2016.03.009

Abstract

Abstract: To solve the internal pollution,sediment and overlying water from xiaocao River were analyzed.Xiaocao River is the stream segment of Fuyang River through Hengshui City.The release of nitrate nitrogen is studied by static simulation in the laboratory.The diffusion flux of nitrate nitrogen on the interface of sediment-water is calculated.The results show that the content of carbon,nitrogen and phosphorus gradually decrease with the increase of the sampling depth.The dissolved oxygen is very lower,which indicates the overlying water is in an anoxic condition.The organic pollution is serious.The nutrient concentrations are close to or even more than the limits of Ⅴ class surface water environmental quality standard.The river has high nutritional risk.Under different temperatures,the release of nitrate nitrogen in the surface sediments rises first and then falls,and the lower the temperature,the more serious the release.At the temperature of 5 ℃,the release of nitrate nitrogen in different depths of sediments increases first and then becomes- DOI:10.3969/j.issn.1000-1565.2016.03.009滏阳河衡水市区段沉积物硝酸盐氮的扩散规律边蔚,田在锋,李楠,魏全伟,徐元强(河北省环境科学研究院水环境科学研究所,河北石家庄 050037)摘要:为解决内源负荷污染问题,对滏阳河衡水市区主城区小漕河沉积物和上覆水的性质进行了分析测试,采用实验室静态模拟法研究了硝酸盐氮的释放规律,并计算了其沉积物-水界面的扩散通量.结果表明:垂向沉积物中C、N、P营养盐随着深度的增加,含量逐渐降低.上覆水呈缺氧状态,有机污染严重,营养盐浓度接近甚至超过地表水环境质量标准Ⅴ类限值,富营养化风险高.不同温度下,表层沉积物硝酸盐的释放先上升再下降,且温度越低,越有利于其释放.温度为5 ℃时,不同深度沉积物硝酸盐的释放先增加后平缓再逐渐下降,且随着深度的增加,释放强度逐渐减弱.硝酸盐氮释放通量为-0.49 mg/(m²·d),总体表现为由上覆水向沉积物扩散.研究结果为滏阳河衡水市区段环境综合整治工程以及子牙河流域水污染防治与水质改善提供数据支持.关键词:滏阳河;沉积物;上覆水;内源污染;硝酸盐氮;扩散规律中图分类号:X522 文献标志码:A 文章编号:1000-1565(2016)03-0269-09Diffusion of nitrate nitrogen in sediment of stream segmentof Fuyang River through Hengshui CityBIAN Wei,TIAN Zaifeng,LI Nan,WEI Quanwei,XU Yuanqiang(Institute of Water Environmental Sciences,Hebei Provincial Academy of Environmental Sciences,Shijiazhuang 050037,China)Abstract:To solve the internal pollution,sediment and overlying water from xiaocao River were analyzed.Xiaocao River is the stream segment of Fuyang River through Hengshui City.The release of nitrate nitrogen is studied by static simulation in the laboratory.The diffusion flux of nitrate nitrogen on the interface of sediment-water is calculated.The results show that the content of carbon,nitrogen and phosphorus gradually decrease with the increase of the sampling depth.The dissolved oxygen is very lower,which indicates the overlying water is in an anoxic condition.The organic pollution is serious.The nutrient concentrations are close to or even more than the limits of Ⅴ class surface water environmental quality standard.The river has high nutritional risk.Under different temperatures,the release of nitrate nitrogen in the surface sediments rises first and then falls,and the lower the temperature,the more serious the release.At the temperature of 5 ℃,the release of nitrate nitrogen in different depths of sediments increases first and then becomes- 收稿日期:2015-08-25 基金项目:国家水体污染控制与治理科技重大专项(2012ZX07209-003) 第一作者:边蔚(1983-),女,河北石家庄人,河北省环境科学研究院工程师,博士,主要从事水环境保护方面的研究.E-mail:bianbianweiwei@126.com 通信作者:田在锋(1971-),男,河北邢台人,河北省环境科学研究院高级工程师,主要从事环境保护方面的研究.E-mail:tianzaifeng@sina.com第3期边蔚等:滏阳河衡水市区段沉积物硝酸盐氮的扩散规律stable and eventually gradually decrease,and when the depth is deeper,the release intensity is weaker.The amount of the NO₃^--N diffusion flux is -0.49 mg/(m²·d),and its releasing trend is from the overlying water to the sediment.The results provide data support to the environmental comprehensive renovation project of stream segment of Fuyang River through Hengshui City and to the water pollution control and water quality improvement of Ziya River basin.

Key words: Fuyang River, sediment, overlying water, internal pollution, nitrate nitrogen, diffusion law

CLC Number:

X522

BIAN Wei,TIAN Zaifeng,LI Nan,WEI Quanwei,XU Yuanqiang. Diffusion of nitrate nitrogen in sediment of stream segment of Fuyang River through Hengshui City[J]. Journal of Hebei University (Natural Science Edition), 2016, 36(3): 269-277.

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