西海后海连通渠生物填料更新工程适用性分析

Applicability Analysis on Biological Filling Renewal Project in the Connecting Canal between Xihai and Houhai

北京城市河湖担负着景观、供水、行洪、通航等多项功能,但受到水资源紧缺、水源水质差、点源及面源污染、水体自净能力弱等多方面因素影响,易处于严重的富营养化状态。选择西海、后海作为研究对象,针对西海后海污染现状及其特殊重要性,实施了西海后海连通渠生物填料更新工程,采取物理、生物等不同技术措施对水质予以改善。通过对西海后海连通渠生物填料更新工程开展背景监测和跟踪监测,对其水质修复效果予以定量评价,研究水质改善修复技术措施的合理性及适用性,从而为指导城市河湖水质改善技术选择与推广应用提供依据。通过测定总磷、化学需氧量、氨氮等指标,对所选择工程技术予以效果评估和适用性分析。结果表明:生物接触氧化技术结合曝气使得CODcr、NH_(3)-N、TP下降,分别达到Ⅲ类、Ⅲ类和Ⅳ类水标准,水质改善明显;但设备安装对水体地理位置要求高且对行洪有一定影响,适合用于城市相对静止的湖泊通道中,因此生物接触氧化技术在城市河湖相对静止的湖泊通道中可以使用,有一定的推广意义。

The urban rivers and lakes in Beijing are responsible for many functions such as landscape,water supply,flood discharge and navigation.However,they are vulnerable to severe eutrophication due to the shortage of water resources,poor water quality,point source and non-point source pollution,weak self-purification capacity of water bodies and other fac⁃tors.Regarding the pollution status and special importance of Xihai and Houhai,the biological filling renewal project in the connecting canal between Xihai and Houhai is conducted through physical,biological and other technical measures to im⁃prove the water quality.In this paper,background monitoring and tracking monitoring are carried out on the biological fill⁃ing renewal project in the connecting canal between Xihai and Houhai,and quantitative evaluation is made on the effect of water quality restoration,and the rationality and applicability of water quality improvement and restoration technical mea⁃sures are studied,so as to provide a basis for the selection and promotion of water quality improvement technology in urban rivers and lakes.By measuring total phosphorus,chemical oxygen demand,ammonia nitrogen and other indicators,the ef⁃fect of the selected engineering technology is evaluated and its applicability is analyzed.The results show that the CODcr,NH_(3)-N and TP decreased by biological contact oxidation combined with aeration,reaching Class Ⅲ,Class Ⅲ and Class Ⅳ water standard respectively and the water quality is improved obviously.However,the installation of the equipment has high requirements on the geographical location of water bodies and has a certain impact on flood discharge,so it is suitable for the relatively static lake passage in the city.Therefore,the biological contact oxidation technology can be used in the rela⁃tively static lake passage in the urban rivers and lakes and has a certain promotion significance.