基于絮凝沉淀-人工湿地-回灌的水处理工程实践

Water Treatment Engineering Practice Based on Flocculation Sedimentation,Constructed Wetland and Artificial Recharge System

德阳市公共供水主要依靠地下水,水资源短缺问题严重制约着社会经济发展。将微污染河水经絮凝沉淀与人工湿地处理后回灌补给地下水并建立傍河地下水水源地,具有河水处理-再利用-调蓄开发三位一体的优势。通过构建一套絮凝沉淀-人工湿地-地下水回灌系统,并结合数值模拟,探讨了系统运行各阶段的水质净化效果及地下水回灌与开采供水的可行性。结果表明,经絮凝沉淀-人工湿地处理后,浊度、TP、TN、COD_(Mn)、NH_4^+-N均可达到工程设计回灌水质要求。地下水回灌-开采供水系统对原生地下水环境造成的影响有限,人工湿地-地下水回灌-供水系统能够正常运行。

The water supply of Deyang City mainly relies on groundwater, and the shortage of wa- ter resources seriously restricts its social and economic development. The micro-polluted river water was recharged groundwater after being treated by flocculation sedimentation and constructed wetland, and riv- erside groundwater resource field was established which had the advantages of river water treatment, re- use, storage and development. A set of flocculation sedimentation - constructed wetland - groundwater recharge system was established, and numerical simulation were carried out to investigate the water treat- ment effect at each operation stage and the feasibility of groundwater recharge and water supply. When the raw water was treated by flocculation sedimentation and constructed wetland, the turbidity, TP, TN, CODM,1 and NH4 -N could meet the water quality standards of artificial recharge. The groundwater re- charge and supply system had a limited impact on the original groundwater environment, and the con- structed wetland -groundwater recharge -water supply system could be operated normally.