扬水曝气器对水源水库水质改善及沉积物控制

Improvement of water quality and sediment control by WLAs in a source water reservoir

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.

The paper focused on the dissolved oxygen consumption rate of water and sediment as well as the sedimentrelease potential in situ.Improvement effects the operation of WLAs(water lifting aerators)of water quality and sedimentwas also researched.The dissolved oxygen consumption rate of water and sediment was at high levels showed by in situexperiment,which were0.106~0.132mg/(L·d)and0.358~0.410mg/(L·d).In the main reservoir the maximum releasepotential of Fe,TOC,TN and TP was2.3~2.7,4.4~5.2,3.0~3.3and0.165~0.224mg/L in480h.In the controlled area ofthe WLAs,the reduction rates of Fe,TOC,TN and TP in water were78.6%,22.9%,47.8%and66.7%,and those insurface sediment were8.7%,17.4%,18.0%and17.4%.The results of Biolog measurement indicated that microbialactivity both in water and in surface sediment have been enhanced through the operation of WLAs.WLAs technology hasbeen proved to be effective in in situ improvement of water quality and sediment in deep stratified reservoirs.And fieldapplication of WLAs has achieved remarkable results.