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Int. J. Environ. Res. Public Health 2017, 14(11), 1298;

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

State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
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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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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