复合垂直流人工湿地除氮正交试验研究_王全金

复合垂直流人工湿地除氮正交试验研究王全金1,李忠卫2,李丽1(1.华东交通大学土木建筑工程学院,江西南昌330013;2.中国瑞林工程技术有限公司,江西南昌330002)摘要[目的]为提高湿地除氮效率提供理论依据。[方法]选择美人蕉和风车草构建的复合垂直流人工湿地试验系统开展除氮正交试验研究,确定复合垂直流人工湿地流程、水力负荷、pH值、COD等因素对除氮效果的影响。[结果]复合垂直流人工湿地流程、水力负荷、pH值、COD等对除氮效果均具有影响,各因素对氨氮去除率的影响由大到小依次为:流程>水力负荷>pH值>COD,对总氮去除率的影响由大到小依次为:流程>水力负荷>COD>pH值;当流程为1100mm,水力负荷为181.25mm/d,pH值为7～8,COD为170mg/L时,除氮效果最好,美人蕉、风车草湿地对氨氮的去除率分别为55.90%和55.49%,对总氮的去除率分别为70.69%和65.80%。[结论]该研究确定了复合垂直流人工湿地除氮的最佳运行工况。关键词垂直流人工湿地;除氮效果;正交试验中图分类号X703.1文献标识码A文章编号0517-6611(2010)17-09211-03OrthogonalExperimentalResearchonNitrogenRemovalwithIntegratedVerticalFlowConstructedWetlandsWANGQuan-jinetal(CollegeofCivilandBuildingEngineering,EastChinaJiaotongUniversity,Nanchang,Jiangxi330013)Abstract[Objective]Theaimwastosupplythetheoreticalbasisforenhancingnitrogen(N)removalefficiencyofwetland.[Method]Theex-perimentalsystemofintegratedverticalflowconstructedwetlands,whichwereconstructedwithIndiacannaandwindmillgrasswereselectedfordevelopingorthogonalexperimentalresearchonNremoval.Thentheinfluencesoffactorssuchasflowlength,water-powerload,pHvalueandCODofintegratedverticalflowconstructedwetlandsonNremovaleffectwereconfirmed.[Result]Thefactorssuchasflowlength,water-powerload,pHvalueandCODofintegratedverticalflowconstructedwetlandsallhadinfluencesonNremovaleffect.TheinfluencesofvariousfactorsonremovalrateofammoniaNwereasfollows:flowlength>water-powerload>pHvalue>COD;theirinfluencesonremovalrateoftotalNwereasfollows:flowlength>water-powerload>COD>pHvalue.Whentheflowlengthwas1100mm,thewater-powerloadwas181.25mg/L,thepHvaluewas7-8andtheCODwas170mm/d,theNremovaleffectwasthebest.TheremovalratesofwetlandsconstructedwithI.cannaandwindmillgrassonammoniaNwere55.90%and55.49%resp.andtheirremovalratesontotalNwere70.69%and65.80%resp.[Conclusion]Inthisresearch,theoptimumoperationconditionforNremovalofintegratedverticalflowconstructedwetlandswasconfirmed.KeywordsVerticalflowconstructedwetland;Nitrogenremovaleffect;Orthogonalexperiment基金项目国家“十一五”科技支撑计划重点课题(2008BAD96B04);江西省自然科学基金项目(2007