纳米MgO对废水COD去除效果的研究_林玲玲

纳米MgO对废水COD去除效果的研究林玲玲，王风，张克强，李军幸，杜连柱（农业部环境保护科研监测所，天津300191）［摘要］以模拟废水为研究对象，评价纳米MgO对COD的去除效果。研究了常温下光源类型（避光、自然光、紫外光）、MgO投加量及光照时间等因素对废水COD去除效果的影响。结果表明：在模拟废水COD为140mg/L条件下，紫外光的作用明显优于避光和自然光条件；随着纳米MgO投加量的增加，COD去除率升高，在紫外光照射3.5h，纳米MgO投加量为20g/L时，COD去除率可达73%。在此最佳工艺条件下，养殖废水的COD去除率可达68.15%，达到农业灌溉标准。［关键词］纳米氧化镁；COD去除率；紫外光；养殖废水［中图分类号］X703［文献标识码］A［文章编号］1005-829X（2011）06-0028-04PreliminaryexperimentalstudyonremovalefficiencyofCODbynanocrystallinemagnesiaLinLingling，WangFeng，ZhangKeqiang，LiJunxing，DuLianzhu（InstituteofAgro-EnvironmentalProtection，MinistryofAgriculture，Tianjin300191，China）Abstract：SimulatedwastewaterhasbeenappliedtotheevaluationofCODremovalefficiencybyusingnano-MgO.Theeffectsofdifferenttypesoflightsources（light-tight，sunlight，ultraviolet）atnormaltemperature，nano-MgOdosageandlightapplicationtimeonthewastewaterCODremovalefficiencyarestudied.TheresultsshowthatwhentheCODofsimulatedwastewateris140mg/L，theCODremovalrateunderUVlightisbetterthanthatunderlight-tightorsunlightconditions.TheCODremo