水解-复合潜流人工湿地系统脱氮工艺优化研究

Process Optimization of Nitrogen Removal in Hydrolytic Tank- Vertical- Horizontal Subsurface Flow Constructed Wetland System

研究水解池-垂直潜流-水平潜流人工湿地系统处理农村生活污水中,水力停留时间、溶解氧、C/N等工艺参数和运行条件对COD、NH+4-N、NO-3-N、TN去除效率的影响,优化水解池、人工湿地结构和运行工艺,建立高效去除COD、NH+4-N、NO-3-N、TN的好氧/厌氧串联潜流人工湿地。结果表明,水解池HRT=3 h,垂直潜流湿地HRT=7 d,水平潜流湿地HRT=5 d;浅根植物与深根植物搭配,设置通气管建造垂直潜流湿地;提高水平潜流湿地的C/N,系统的NH+4-N、NO-3-N、TN的去除率分别达到了89%、51%、85%,提高了系统的脱氮能力。

A hydrolytic tank-vertical-horizontal subsurface flow constructed wetland system for treating rural domestic wastewater is studied and the effects of HRT, DO and C/Non the removal of COD,NH+ 4-N,NO-3-N,TN are discussed. The results show that the removal rate of NH+ 4-N,NO-3-N and TN can reach 89%,51% and 85% respectively and the nitrogen removal capacity can be improved under conditions that, this system is constructedwith hydrolytic tankHRT= 3 h, vertical subsurface flowwetlands HRT= 7 d and horizontal subsurface flow wetland HRT= 5 d, DO in vertical subsurface flowwetland is set up and C/N in horizontal subsurface flowwetland is improved.