扬水曝气器对水源水库水质改善及沉积物控制

中国环境科学2017,37(1)：210~217ChinaEnvironmentalScience扬水曝气器对水源水库水质改善及沉积物控制周子振,黄廷林*,李扬,龙圣海,周石磊(西安建筑科技大学环境与市政工程学院,陕西西安710055)摘要：研究了分层型深水水库(金盆水库)水体和沉积物的耗氧速率及沉积物原位释放状况,以及扬水曝气系统运行对水体和沉积物的原位改善效果.原位测定结果表明,金盆水库水体和沉积物耗氧速率处于较高水平分别为0.106~0.132mg/(L·d)和0.358~0.410mg/(L·d).在480h内,主库区沉积物Fe、TOC、TN和TP最大释放浓度达到2.3~2.7,4.4~5.2、3.0~3.3和0.165~0.224mg/L.扬水曝气系统运行时期,对作用区域水质和沉积物原位改善结果表明,水体中Fe、TOC、TN和TP浓度削减率分别达到78.6%、22.9%、47.8%和66.7%,其在沉积物中的浓度削减率分别为8.7%、17.4%、18.0%和17.4%.Biolog测定结果表明扬水曝气系统运行过程中,水体和表层沉积物的微生物活性都得到了增强.扬水曝气器系统是深水水库水质和沉积物原位改善的有效技术,且其现场应用已取得显著效果.关键词：原位沉积物释放；耗氧速率；扬水曝气系统；原位改善中图分类号：X524文献标识码：A文章编号：1000-6923(2017)01-0210-08ImprovementofwaterqualityandsedimentcontrolbyWLAsinasourcewaterreservoir.ZHOUZi-zhen,HUANGTing-lin*,LIYang,LONGSheng-hai,ZHOUShi-lei(SchoolofEnvironmentalandMunicipalEngineering,Xi'anUniversityofArchitectureandTechnology,Xi'an,710055China).ChinaEnvironmentalScience,2017,37(1)：210~217Abstract：Thepaperfocusedonthedissolvedoxygenconsumptionrateofwaterandsedimentaswellasthesedimentreleasepotentialinsitu.ImprovementeffectstheoperationofWLAs(waterliftingaerators)ofwaterqualityandsedimentwasalsoresearched.Thedissolvedoxygenconsumptionrateofwaterandsedimentwasathighlevelsshowedbyinsituexperiment,whichwere0.106~0.132mg/(L·d)and0.358~0.410mg/(L·d).InthemainreservoirthemaximumreleasepotentialofFe,TOC,TNandTPwas2.3~2.7,4.4~5.2,3.0~3.3and0.165~0.224mg/Lin480h.InthecontrolledareaoftheWLAs,thereductionratesofFe,TOC,TNandTPinwaterwere78.6%,22.9%,47.8%and66.7%,andthoseinsurfacesedimentwere8.7%,17.4%,18.0%and17.4%.TheresultsofBiologmeasurementindicatedthatmicrobialactivitybothinwaterandinsurfacesedimenthavebeenenhancedthroughtheoperationofWLAs.WLAstechnologyhasbeenprovedtobeeffectiveininsituimprovementofwaterqualityandsedimentindeepstratifiedreservoirs.AndfieldapplicationofWLAshasachievedremarkableresults.Keywords：sedimentreleaseinsitu；dissolvedoxygenconsumptionrate；WLAs；improvementinsitu水体污染物质长时期吸附并沉积于湖泊、水库沉积物.沉积物作为污染物质汇的同时也可能演变为污染物的源[1-3].尤其对于深水分层型水库,夏季水体分层时期,底部水体溶解氧被水体和沉积物中还原性物质及底栖生物呼