摘要
Abstract
[Objective]This paper takes a factory constructed wetland with a water treatment capacity of 40 000 cubic meters per day in the southern Jiangsu region as an example to analyze the design characteristics and key points in the operation process of constructed wetlands in areas with low winter temperatures and humid and hot summers.The aim is to provide reasonable reference for the design,operation and management of similar wetlands,as well as subsurface and surface flow constructed wetlands.[Methods]The paper introduced the characteristics of low pollutant content in the influent of the constructed wetland of Jiangbian wastewater treatment plant(WWTP).The design of the constructed wetland adopted a combination of subsurface flow wetland and surface flow wetland.The treatment effects of COD,ammonia nitrogen,TN,and TP in tailwater during the wetland start-up period(0～6 weeks),transition period(7～18 weeks),and stable period(19～30 weeks and nearly a year)were analyzed,and the mechanisms of pollutant reduction were explored.The operation of constructed wetlands should be started in spring.During the management process,regular maintenance of channels and pipelines should be carried out,plants in the wetland should be maintained,human intervention in wetland animals should be controled,and wetland water quality monitoring should be well done,and explain the compositions and allocation of wetland operating costs.[Results]The actual operation result showed that the project started quickly,operated easily,and the average removal rates of COD,ammonia nitrogen,TN,and TP during the stable operation stage were 21.7％,20.0％,10.9％,and 10.4％.After the stable operation of wetlands,they could transform"engineering water"into"ecological water",change the public's inherent impression of WWTP's tailwater,won the understanding of surrounding people,and achieved better social benefits.[Conclusion]Constructed wetlands can reduce COD,ammonia nitrogen TN,TP of WWTP's tailwater,further optimize water quality,enhance people's acceptance of tailwater,and provide a foundation for the resource utilization of wastewater.关键词
人工湿地/生态缓冲/运行要点/适时采收/生态水/社会效益Key words
constructed wetland/ecological buffering/key points of operation/timely collecting/ecological water/social benefit分类
资源环境
