特别选题
严莉,黄炳彬,何春利,胡晓静,樊维杰.沙河水库周边典型排口降雨溢流污染特征研究[J].环境科学学报,2022,42(3):28-39
沙河水库周边典型排口降雨溢流污染特征研究
- Research on the pollution of the combined sewer overflow in Shahe Reservoir watershed
- 基金项目：国家水体污染控制与治理科技重大专项（No. 2017ZX07102-002）
- 作者
- 单位
- 严莉
- 北京市水科学技术研究院，北京 100048;河海大学水文水资源学院，南京 210098
- 黄炳彬
- 北京市水科学技术研究院，北京 100048
- 何春利
- 北京市水科学技术研究院，北京 100048
- 胡晓静
- 北京市水科学技术研究院，北京 100048
- 樊维杰
- 北京市昌平区水务局，北京 102299
- 摘要：在北运河源头区沙河水库选取4个典型溢流排口进行合流制溢流污染监测，分析沙河水库附近管网溢流水量水质变化特征.结果表明：由于TBD再生水厂尚未建成运行，沙河水库周边管网处于满负荷运行状态，0.5~3 mm降雨即可导致溢流发生，溢流水量与场次降雨量呈正相关，同时也受降雨历时、降雨强度等多种因素作用；溢流污染水平与排口性质以及管网收集区域具有直接联系，截污干管溢流排口是重点防控对象，其汛期COD、NH3-N、TN、TP平均浓度分别超地表水Ⅴ类标准6.77、8.35、14.36、7.73倍；不同场次降雨中汛期初期的降雨溢流污染水平最高，同一场次降雨中溢流前期200~400 min污染物平均浓度最高；汛期初期溢流水体中污染物主要以颗粒态存在，正式进入汛期之后污染物主要以溶解态存在.
- Abstract：Four typical overflow outlets were selected in Shahe Reservoir， which is the source area of the North Canal， to monitor the pollution of the Combined Sewer Overflow （CSO）. The overflow volume and water quality change in the pipeline near Shahe Reservoir are analyzed. The results show that the drainage pipeline around Shahe Reservoir is in full load， and the overflow can be caused by rainfall， because there is no reclaimed water plant. A positive correlation between the overflow volume and the rainfall was observed. The overflow volume is also affected by many factors such as rainfall duration and rainfall intensity. Moreover， the overflow pollution level is directly related to the nature of the discharge and the collection area of the pipeline. The overflow discharge of the main sewage pipeline is the key factor for water prevention and pollution control， and the average concentrations of COD， NH3-N， TN and TP in flood season were 6.77， 8.35， 14.36 and 7.73 times higher than the standard index of surface water Class V， respectively. The rainfall overflow pollution level was the highest at the beginning of flood season， and the average concentration was the highest at 200~400 minutes at the beginning of overflow in the same rainfall. At the beginning of flood season， the pollutants in the overflow were mainly present in granular form， while in dissolved form after the flood season.
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