新型缓释碳源的制备及其性能_王润众

第10卷第1期环境工程学报Vol．10，No．12016年1月ChineseJournalofEnvironmentalEngineeringJan．2016新型缓释碳源的制备及其性能王润众1，2郝瑞霞1赵文莉1(1．北京工业大学建筑工程学院，北京市水质科学与水环境恢复工程重点实验室，北京100124;2．北京碧水源科技股份有限公司，北京102206)摘要为了提高淀粉/聚乙烯醇(PVA)缓释碳源的反硝化速率，并有效控制碳源的释放速率，采用添加醋酸酯淀粉、疏水性乳化剂(SPAN80)以及二次包裹、表层交联等方法，制备了新型缓释碳源，通过释碳和脱氮实验考察了缓释碳源的最佳材料配比、脱氮效率以及碳源的释放规律。结果表明:缓释碳源中淀粉比例越高，反硝化效率越高，但释碳速率过快，容易造成出水COD偏高;当淀粉含量为58．2%时，能够获得适宜的脱氮效率和释碳速率，其反硝化滤柱的硝态氮去除率达100%，平均反硝化速率和出水COD分别为11．67mg/(L·h)和27．65mg/L，碳源释放与利用基本达到平衡。制备的新型缓释碳源其脱氮效率高、使用周期长、碳源释放得到有效控制，具有良好的工程应用前景。关键词醋酸酯淀粉聚乙烯醇新型缓释碳源释碳速率反硝化脱氮中图分类号X703文献标识码A文章编号1673-9108(2016)01-0081-07Preparationandpropertiesofnewslow-releaseorganiccarbonsourceWangＲunzhong1，2HaoＲuixia1ZhaoWenli1(1．KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentalＲecoveryEngineering，CollegeofArchitectureandCivilEngineering，BeijingUniversityofTechnology，Beijing100124，China;2．BeijingOriginWaterTechnologyCo．，Ltd．，Beijing102206，China)AbstractToimprovethedenitrificationrateofstarch/polyvinylalcohol(PVA)andeffectivelycontrolthecarbonreleaserate，anewslow-releaseorganiccarbonsource(SOC)wassynthesizedbyaddingacetatestarch/hydrophobicemulsifier(SPAN80)，secondaryencapsulationandsurfacecross-linkingreaction．Theoptimumma-terialratio，nitrogenremovalefficiencyandreleasemodelofSOCwereinvestigatedbycarbonreleaseanddenitri-ficationexperiments．TheresultsshowedthatthedenitrificationefficiencywouldascendrapidlywithaugmentingofstarchcontentinSOCwhiletheriseofreleasespeedmayincreasetheconcentrationofCODintheeffluent．Whenthecontentofstarchwas58．2%，theappropriatecarbonreleaserateandnitrogenremovalefficiencycouldbeobtainedandthenitrateremovalefficiency，averagedenitrificationrateandtheeffluentconcentrationofCODcouldreach100%，11．67mg/(L·h)and27．65mg/L，asthecarbonemissionandutilizationachievedabal-ance．Sothehighnitrogenremovalefficiency，longlifecycleandcontrolledcarbonreleaseratemadethenewSOCsuitableforengineeringapplication．Keywordsacetatestarch;polyvinylalcohol(PVA);newslow-releaseorganiccarbonsource;carbonre-leaserate;denitrificati