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Improvement of water quality and sediment control by WLAs in a source water reservoir |
ZHOU Zi-zhen, HUANG Ting-lin, LI Yang, LONG Sheng-hai, ZHOU Shi-lei |
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055 China |
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Abstract The paper focused on the dissolved oxygen consumption rate of water and sediment as well as the sediment release potential in situ. Improvement effects the operation of WLAs (water lifting aerators) of water quality and sediment was also researched. The dissolved oxygen consumption rate of water and sediment was at high levels showed by in situ experiment, which were 0.106~0.132mg/(L·d) and 0.358~0.410mg/(L·d). In the main reservoir the maximum release potential of Fe, TOC, TN and TP was 2.3~2.7, 4.4~5.2, 3.0~3.3 and 0.165~0.224mg/L in 480h. In the controlled area of the WLAs, the reduction rates of Fe, TOC, TN and TP in water were 78.6%, 22.9%, 47.8% and 66.7%, and those in surface sediment were 8.7%, 17.4%, 18.0% and 17.4%. The results of Biolog measurement indicated that microbial activity both in water and in surface sediment have been enhanced through the operation of WLAs. WLAs technology has been proved to be effective in in situ improvement of water quality and sediment in deep stratified reservoirs. And field application of WLAs has achieved remarkable results.
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Received: 25 February 2016
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