好_厌氧多级串联潜流人工湿地对COD的去除效果_李锋民

第33卷好/厌氧多级串联潜流人工湿地对COD的去除效果李锋民，宋妮，单时，王震宇*（中国海洋大学环境科学与工程学院，山东青岛266100）摘要：为了调整传统潜流湿地内部溶解氧分布状态，提高其对生活污水水质净化的效率，对传统潜流湿地进行了不同区段的划分及功能强化，设计了不同结构的好氧/厌氧多级串联潜流人工湿地，研究了好氧/厌氧段比例、位置及人工曝气等因素对出水COD的影响，并与传统潜流湿地进行净化效果的比较。结果表明，传统潜流湿地对COD的去除率为70.3%，以好氧/厌氧/好氧段方式串联采用前部和后部曝气并作厌氧处理的潜流湿地(即O-A-O强化曝气组)对COD的去除率为90.1%，比传统潜流湿地提高了19.8%；O-A-O强化曝气组平均出水浓度为17.4mg/L，不曝气的O-A-O出水COD浓度基本维持在50.0~60.0mg/L；对O-A-O前部和后部曝气处理后COD的去除率分别提高了30.4%和20.8%。可见，在实验条件下O-A-O强化曝气组对COD的去除率最高，结构相同的湿地曝气处理后出水水质有显著改善，在湿地前部曝气对COD的去除效果尤为显著。关键词：曝气；溶解氧；好氧/厌氧串联；COD；去除率中图分类号：X703文献标志码：Adoi：10.3969/j.issn.1003-6504.2010.6E.003文章编号：1003-6504(2010)5E-0008-04RemovalEfficiencyofCODinAerobic/anaerobicSubsurfaceFlowConstructedWetlandsLIFeng-min,SONGNi,SHANShi,WANGZhen-yu﹡（CollegeofEnvironmentalScienceandEngineering,OceanUniversityofChina,Qingdao,266100）Abstract：Inordertoadjustthedissolvedoxygeninthetraditionalsubsurfaceflowconstructedwetlands(SFCWs)andincreasethepurificationefficiencyofsewagewater,thetraditionalSFCWsweredividedintodifferentsectionswithenhancedfunctions.Differentkindsofaerobic/anaerobicSFCWsweredesignedtostudytheinfluenceofratioandlocationofaerobic/anaerobic,artificialaerationandotherfactorsontheCODineffluent.ThepurificationefficiencyofthewaterinthisstudywascomparedwiththatintraditionalSFCWs.TheresultsshowthattheremovalefficiencyofCODintraditionalSFCWswas70.3%but90.1%inaerobic/anaerobic/aerobicSFCWswithaeration(O-A-OSFCWswithaeration)treatment.Aerationinthefrontandintherear,andanaerobictreatmentinthemiddlewasusedinthistreatment.CODconcentrationintheeffluentofO-A-OSFCWswithaerationtreatmentwas17.4mg/L,whilethatofO-A-OSFCWswithoutaerationwasat50.0~60.0mg/L.TheremovalefficienciesofCODinnewSFCWswithaerationinthefrontandintherearwereincreasedby30.4%and20.8%.Intheexperimentalconditions,O-A-OSFCWswithaerationhadthehighestremovalefficiencyofCOD,andthewaterqualityofthesamestructureSFCWshadsignificantimprovementafteraeration.Inaddition,SFCWswithaerationinthefrontcouldincreaseremovalrateofCODremarkablely.Keywords：aeration；dissolvedox