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首页> 中文期刊> 《环境工程技术学报》 >洨河沉积物中有机物、氮、磷浓度分布特征

洨河沉积物中有机物、氮、磷浓度分布特征

         
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摘要

Given the scarcity of fresh water resources in Haihe Basin, an increasing amount of wastewater has been used for irrigation in the area, posing a major threat to the environmental health. The contents and distribution of organic matter (OM), nitrogen and phosphorus in different forms in the sediments of the Xiao River, a typical sewage river, were analyzed, and the release mechanism of pollutants from the sediments and their impacts on the local environment were investigated. The results show that the release mechanism of total nitrogen (TN) in the sediments is similar to that of the OM, the distributions of OM and TN in the sediments have no relations to the content of OM and TN in the river water. This may be due to the fact that the OM and TN of sediments in different river section are governed by different factors; in the river section without sediments dredging, OM and TN are mainly caused by the diffusion and release of deep sediments to surface sediments, and in the river section with sediment dredging, the contents of OM and TN are associated with the water project condition, microbial activities and other factors. The total phosphorus (TP) in the sediments has no relation to the TP in water, primarily due to the fact that the Ca-P and Fe∕Al-P can be combined to form a kind of insoluble phosphate. The TP in the sediments has no relation to TN and OM, as the phosphate adsorption of sediments is significantly related to the contents of Ca2+, Al3+, and Fe2+(or Fe3+) in the water.%海河流域由于水资源匮乏,污染河水被用于灌溉的情况较为普遍,存在严峻的环境风险.研究了海河流域典型纳污河流洨河沉积物中有机物(OM)和不同形态氮、磷浓度与分布,分析了洨河沉积物沉积和释放的机理及其可能产生的环境影响.结果表明:沉积物中总氮(TN)的沉积和释放机理与OM类似,沉积物中OM和TN浓度分布与河水中的不相关,可能是由于沉积物中OM与TN浓度在不同河段受不同因子控制,在沉积物未疏浚河段,OM与TN主要源于深层沉积物向表层沉积物中的扩散释放,而在底泥疏浚河段,沉积物中OM与TN浓度与水利条件以及微生物活动等多种因素有关;沉积物中总磷(TP)浓度与水体中的相关性不显著,可能是因为钙磷(Ca-P)与铁铝磷(Fe∕Al-P)会结合成某种难溶性磷;沉积物中TP浓度与TN、OM浓度相关性不显著,因为沉积物对磷的吸附主要与水体中的Ca2+、Al3+、Fe2+(或Fe3+)浓度有关.

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  • 来源
    《环境工程技术学报》 |2018年第3期|241-247|共7页
  • 作者

    李任飞; 檀文炳; 高如泰; 黄彩红; 张慧; 李丹; 何小松; 席北斗;

  • 作者单位

    兰州交通大学环境与市政工程学院,甘肃 兰州 730070;

    中国环境科学研究院地下水与环境系统工程创新基地,北京 100012;

    中国环境科学研究院地下水与环境系统工程创新基地,北京 100012;

    中国环境科学研究院地下水与环境系统工程创新基地,北京 100012;

    中国环境科学研究院地下水与环境系统工程创新基地,北京 100012;

    中国环境科学研究院地下水与环境系统工程创新基地,北京 100012;

    中国环境科学研究院地下水与环境系统工程创新基地,北京 100012;

    中国环境科学研究院地下水与环境系统工程创新基地,北京 100012;

    兰州交通大学环境与市政工程学院,甘肃 兰州 730070;

    中国环境科学研究院地下水与环境系统工程创新基地,北京 100012;

    环境基准与风险评估国家重点实验室,中国环境科学研究院,北京 100012;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 河流;
  • 关键词

    洨河; 沉积物; 有机物; 氮; 磷; 沉积和释放机理; 污灌;

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