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Int. J. Environ. Res. Public Health 2017, 14(11), 1298; https://doi.org/10.3390/ijerph14111298

Application of Circular Bubble Plume Diffusers to Restore Water Quality in a Sub-Deep Reservoir

1
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
3
College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China
*
Author to whom correspondence should be addressed.
Received: 16 August 2017 / Revised: 19 October 2017 / Accepted: 22 October 2017 / Published: 26 October 2017
(This article belongs to the Section Environmental Science and Engineering)
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Abstract

Circular bubble plume diffusers have been confirmed as an effective technology for the restoration of the deep water system, but have never been applied in sub-deep water system. In this study, circular bubble plume diffusers were used, for the first time, to restore water quality in the Aha Reservoir, a typical sub-deep reservoir in Southwest China. Axisymmetric intrusive gravity currents were formed with a horizontal radius of 250 m at the equilibrium depth and the intrusion of oxygen-enriched water occurred within the depth of 10–14 m, while thermal stratification remained intact. A total of 95% of the imported oxygen was dissolved, but most was consumed by organic matter and other reduced substances within the hypolimnion. The oxygen consumption of organic matter, NH4+ and remaining reduced materials, accounted for 41.4–52.5%, 25% and 13.3–24.4% of the total imported oxygen, respectively. Compared with the control sites, dissolved oxygen level in the hypolimnion increased 3–4 times, and concentrations of NH4+, total Fe and total Mn were reduced by 15.5%, 45.5% and 48.9%, respectively. A significant decrease in total phosphorus and nitrogen concentrations was observed in the experimental zone (0.04–0.02 mg/L and 1.9–1.7 mg/L, respectively). This indicates that circular bubble plumes have great potential for oxygenation of the hypolimnion and improving water quality in the sub-deep water system. Nevertheless, further efforts are needed to improve the discrete bubble model to elaborate the oxygen transmission dynamics and the plume formation processes in sub-deep water systems, incorporating oxygen consumption processes. View Full-Text
Keywords: bubble plume diffusers; sub-deep water system; dissolved oxygen; water quality; consumption fate of oxygen bubble plume diffusers; sub-deep water system; dissolved oxygen; water quality; consumption fate of oxygen
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Lan, C.; Chen, J.; Wang, J.; Guo, J.; Yu, J.; Yu, P.; Yang, H.; Liu, Y. Application of Circular Bubble Plume Diffusers to Restore Water Quality in a Sub-Deep Reservoir. Int. J. Environ. Res. Public Health 2017, 14, 1298.

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