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

International Journal of Environmental Research and Public Health
Chen LanYong Liu

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...Continue Reading

References

Aug 2, 2005·Water Research·Makoto Higashino, Heinz G Stefan
Jan 30, 2007·Environmental Science & Technology·Vickie L Singleton, John C Little
Feb 21, 2009·Science·Daniel J ConleyGene E Likens
Feb 18, 2010·Ocean & Coastal Management·Donald M Anderson
Aug 9, 2012·Environmental Science & Technology·Beat MüllerAlfred Wüest

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