反冲洗措施改善垂直潜流人工湿地水力特性的研究  

Changes of Hydraulics of Constructed Wetlands after Backwashing

作　　者：马飞[1,2] 蒋莉[1] 熊洁羽[1] 曾婷[1] 

机构地区：[1]江苏技术师范学院化学与环境工程学院,江苏常州213001 [2]河海大学水利水电学院,江苏南京210098

出　　处：《环境科学与技术》2011年第7期46-49,共4页Environmental Science & Technology

基　　金：江苏省自然科学基金项目资助(BK2009106);江苏技术师范学院基础及应用基础研究基金项目资助(KYY09023)

摘　　要：人工湿地污水处理工程中难以解决的问题之一是湿地基质堵塞,本研究尝试用反冲洗措施解决此问题。采用不同反冲洗方案研究了反冲洗措施对人工湿地堵塞程度的改善效果,同时分析了反冲洗措施对垂直潜流人工湿地污染物去除效果的改变和水力特性的影响。结果表明,反冲洗措施对解决垂直潜流人工湿地的堵塞有明显地改善;人工湿地发生淤堵使COD去除率下降,反冲洗后随着实际水力停留时间的延长,COD去除率较反冲洗前有所提高;在几种反冲洗方案中,气水联合反冲洗方案在单位面积流量为8～10 L（/m^2·s）,反冲洗时间为57 min时反冲洗效果最好。The purpose is that using backwashing method to resolve filter media clogging problem which is an intractable matter in constructed wetlands project.Improvement of filtration in vertical flow constructed wetlands by various backwashing methods was analyzed.Effects of backwashing on pollutant removal as well as the influence on characteristics of hydrodynamics of wetlands were studied.Results indicated that backwashing is effective in resolving clogging in the vertical flow constructed wetlands.Removal rate of COD would be reduced in clogged constructed wetlands,and then increased after backwashing due to the increase of actual hydraulic retention time.Air-water backwashing is the best method to improve constructed wetlands performance,with technical parameters as backwashing strength 810 L（/m^2·s）and backing washing time 57 min.

关 键 词：垂直潜流人工湿地 湿地淤堵 反冲洗 水力特性 水力停留时间 

分 类 号：X52[环境科学与工程—环境工程]