北京地区再生水补给型河湖水质改善工程案例分析与问题诊断

发布时间：2018-05-03 17:56

本文选题：再生水 + 城市河湖　；参考：《环境科学研究》2016年12期

【摘要】：由于北京地区水资源严重紧缺,再生水作为补给城市河湖景观水体的重要水源,用量逐年加大,随之带来的水环境问题也引起关注,往往需要采用适宜的技术和工程改善水质.通过对北京城市部分再生水补给型河湖现有水质改善工程的调研,分析与评估北京市再生水补给城市河湖景观水体生态修复技术工程建设与运行效果,并与国内外河流、湖泊生态修复经典案例进行了对比分析.结果表明,修复工程受运行时间、季节及后续维护的影响,其运行效果不稳定且逐渐下降.受汛期降水充沛及水量人为调控影响,城市河湖6—9月水质较好;水质恶化时ρ(CODCr)为40~50 mg/L,ρ(NH3-N)为2~5 mg/L,ρ(TN)为10~15 mg/L,ρ(TP)为0.4~1.0 mg/L.水力流动循环、循环过滤、化学除藻和生物调控等单项及相应组合技术是当前北京市再生水补给型河湖水质改善的主要手段.对于水质要求较高的再生水补给型河湖,可以考虑辅膜生物反应器或生物滤池等旁路生化组合工艺.与国外的整流域近自然水生态系统修复相比,我国河湖水生态修复更注重区域水质的改善,以控制水体富营养化为主;对流域生态系统修复的整体性与长效性关注不够,缺乏与园林景观的融合.为更好地发挥河湖水体生态修复工程效果,未来应在政策法规、协调管理及投融资机制等方面加大投入力度.
[Abstract]:Due to the serious shortage of water resources in Beijing, reclaimed water is an important source of water supply for the landscape water of rivers and lakes in the city. The amount of water used increases year by year, and the problems of water environment are also concerned, so it is often necessary to adopt appropriate technology and engineering to improve the water quality. Based on the investigation of the existing water quality improvement projects of some reclaimed water recharge rivers and lakes in Beijing, this paper analyzes and evaluates the construction and operation effect of the ecological restoration engineering of the river and lake landscape water bodies in the reclaimed water supply cities of Beijing, and compares with the rivers at home and abroad. The classic cases of lake ecological restoration were compared and analyzed. The results show that the operation effect of the restoration project is unstable and gradually decreased due to the influence of operation time, season and subsequent maintenance. Under the influence of abundant precipitation in flood season and artificial regulation of water quantity, the water quality of urban rivers and lakes is better in June-September. When the water quality deteriorates, 蟻 ~ (CODCr) is 4050 mg / L, 蟻 ~ (NH _ 3-N) is 2 ~ 5 mg / L, 蟻 _ (TN) is 1 010 ~ (15) mg / L, 蟻 ~ (TGP) is 0.41.0 mg / L. Hydraulic flow cycle, circulating filtration, chemical algal removal and biological regulation are the main methods to improve the water quality of reclaimed rivers and lakes in Beijing. The secondary membrane bioreactor or biofilter and other by-pass biochemical combination processes can be considered for reclaimed water recharge type rivers and lakes with high water quality requirements. Compared with the whole watershed near natural water ecosystem restoration abroad, the river and lake water ecological restoration in China pays more attention to the improvement of regional water quality, mainly to the control of water eutrophication, and does not pay enough attention to the integrity and long-term effect of watershed ecosystem restoration. Lack of integration with the landscape. In order to give full play to the effect of ecological restoration of rivers and lakes, we should increase the investment in the aspects of policies and regulations, coordinated management and investment and financing mechanism in the future.
【作者单位】：北京林业大学环境科学与工程学院;水体污染源控制技术北京市重点实验室;北京市水科学技术研究院;
【基金】：北京市科技计划项目(Z151100002115008)
【分类号】：X52

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