再生水利用是解决水资源短缺和水污染问题的有效途径，越来越受到世界各国的重视。在我国，特别是在严重缺水的北方地区，再生水利用势在必行。北京市人口密集，水资源紧缺，人均占有量不足300m3，是全国人均量的1/8，属于重度缺水区。来源于污水处理厂经深度处理后的再生水水量水质稳定，不仅可以节约宝贵的水资源，同时也缓解污水减排的压力，因此，近年来城市再生水利用工程迅速发展。潮白河在北京城市发展中具有重要战略地位，是顺义新城的主要生态屏障和水环境的重要支撑。自2007年起，潮白河顺义段再生水利用工程将经MBR处理后的温榆河水调入减河，旨在恢复潮白河生态用水，改善奥运场馆周边及顺义新城水环境。本文旨在研究分析潮白河顺义段再生水利用工程中再生水通过河道入渗方式补给地下水产生的水质安全风险问题。再生水补充河道地表水的同时水中携带的少量残余污染物质可能会造成环境风险。通过调研国内外关于再生水水质、再生水利用对地下水的影响等领域的研究进展及前沿，基于国内现有水质标准规范、效应评估和综合评分，建立了风险影响指标识别评估方法，对风险影响指标进行识别、风险等级评定，提出针对该工程的风险管理对象及目标。基于地下水污染风险评估提出的潮白河顺义段再生利用地下水污染风险管理的对象和目标，结合再生水下渗补充地下水过程分析，提出包括再生水水源水质控制、地表水自净作用、包气带截留作用和地下水利用保护等环节的补水过程风险管理方法和措施。
Reclaimed water reuse as an effective way solving water shortage and water contamination has been payed more attention worldwide. It is required in China, especially in the northern area with a desperate shortage of water. Beijing features a dense population and a lack of water resource with an average per capital amount less than 300 m3, only about 1/8 of the national per capital amount. The quality of reclaimed water from advanced treatment of wastewater treatment plant is stable, which not only saves water resource but also alleviates wastewater discharge pressure. In recent years, reuse of reclaimed water has been developed rapidly. Chaobai River is of great strategic position in Beijing urban development. It is the main ecological barrier and important water environmental support of new Shunyi town. Reclaimed water from Wenyu River treated with MBR has been discharged to Shunyi segment of Chaobai River to recover ecological water of Chaobai River and to improve the water quality surrounding the Olympic stadium and the new Shunyi Town. The main purpose of this research was to analyze the water quality safety risk of the reclaimed water which was discharged to Shunyi segment of Chaobai River for groundwater supplement. However, the trace contaminants remained in reclaimed water might be of potential risk to environment. Researches about the quality of reclaimed water and its impact to groundwater during recharge were summarized. Based on the water quality standards, effect assessment, and comprehensive ranking, the risk identification system was established to identify risk and assess risk level. And the object and goal for risk management of this project were raised. The object and goal of groundwater contamination risk management during reclaimed water recharge project at Shunyi Segment of Chaobai River was raised based on groundwater contamination risk assessment. The risk management method and provisions including water quality control of reclaimed water, self-purification of surface water, retain of vadose zone, and groundwater protection were carried out according to the analysis of reclaimed water infiltration to groundwater.
