滴水湖底泥内源营养盐释放行为与曝气运行模式的关系

环境污染与防治第36卷第lO期2014年10月滴水湖底泥内源营养盐释放行为与曝气运行模式的关系*李志洪李文超何岩黄民生。顾佩弟。陈冲。饶应福。(1．华东师范大学上海市城市化生态过程与生态恢复重点实验室，上海200241；2．华东师范大学资源与环境科学学院，上海200241；3．上海港城滴水湖建设管理有限公司，上海201306)摘要以滴水湖上覆水及底泥为研究对象，探讨了不同曝气运行模式对滴水湖底泥内源营养盐释放行为的影响，为曝气原位修复滴水湖等滨海盐碱化地区富营养化人工湖泊提供技术参考。结果表明，曝气能有效降低滴水湖上覆水体NH4+一N浓度，但此类滩涂底泥中较高的盐度能促进内源NH一N的释放并抑制硝化作用，使其NH4+一N削减率明显低于城市重污染河道；静置组TP浓度有所升高，而间歇曝气组及连续曝气组TP削减率分别为63．6和38．5，说明间歇曝气能有效降低上覆水体中的TP浓度；与曝气修复城市重污染河道相比，滴水湖较高的盐度及pH不利于TN去除，其中间歇曝气组对上覆水TN的控制优于连续曝气组与静置组；间歇曝气运行模式更适合于滴水湖等滨海盐碱化地区富营养化人工湖泊的底泥修复。关键词滴水湖盐碱化曝气内源释放沉积物Responsesofsedimentendogenous-nutrientsreleasebehaviorsinDishuiLaketoaerationoperationmodesLIZhi—hong1,2，LIWenchao，HEYan，HU_ANGMinsheng1,2，GUPeidi。，CHENChong。，RAoYingfu。．(1．ShanghaiKeyLabforUrbanEcologicalProcessesandEco—Restoration，EastChinaNormalUniversity，Shanghai200241；2．CollegeofResourcesandEnvironmentalScience，EastChinaNormalUniversity，Shanghai200241；3．ShanghaiHarbourCityDishuiLakeConstructionManagementCo．，Ltd．，Shanghai201306)Abstract：Theresponsesofendogenous—nutrientsreleasebehaviorstodifferentaerationoperationmodeswereinvestigatedusingtheoverlyingwaterandsedimentfromDishuiLakeasresearchobject．Thisthesiscouldprovideteehniea1referencesforin—situaeratedremediationofeutrophiccoasta1salinizationartifieiallakesuchastheDishuiLake．ResultsshowedthataerationcouldeffectivelyreducetheconcentrationofNH+-Ninoverlyingwater．Therela—tivelylowerammoniaremovalefficiencycouldbeattributedmainlybytheincreasedammoniareleaseaswellasthenitrificationinhibitionduetOthehighersalinityofbenchsediment，comparedwithhighlypollutedurbanriver．There—ductionrateofTPunderintermittent—aerationandcontinuous—aerationwas63．60Aand38．5，respectively，whiletheTPlevelwasincreasedwithoutaeration．Additionally，therelativelyhighlevelofsalinityandpHwasdetrimentaltOtheremovalofTN，whichmightaccountfortheworseTNremovalperformanceofDishuiLakethanthatofhighlypollutedurbanriver．Takentogether，theintermittentaerationcouldberecognizedasamoresuitableoperatingmodefortheremediationofeutrophicartificialcoastalsalinizationla