Water Supply (Nov 2022)
Research on the release relationship between dissolved oxygen (DO) and total dissolved gas (TDG) in standing water
Abstract
Supersaturation of dissolved oxygen (DO) and total dissolved gas (TDG) is generated by high dam discharge, excess oxygen production in photosynthesis and increasing temperature in water, which may directly lead to fish suffering from ‘gas bubble disease’ or death. In this paper, under a series of experimental aeration conditions in standing water, it was concluded that aeration had a positively promoting effect on releases of supersaturated DO and TDG, while aeration aperture and aeration depth had inhibitory effects on them. For single factor analysis, aeration had the greatest effect on the release of DO and TDG, the second effect on DO was that of aeration depth and the smallest effect was that of aeration aperture, but the second effect on TDG was that of aeration aperture and the smallest effect was that of aeration depth. Most importantly, the release coefficient of DO was greater than that of TDG, and a quantitative relationship between the release coefficient of DO and TDG and aeration conditions, respectively, was established. An exponential function relationship of the release coefficients of DO and TDG was also established. The results of the research have important guiding significance and theoretical value for reducing the harm caused by supersaturated DO and TDG. HIGHLIGHTS The relationships between dissolved oxygen (DO) and total dissolved gas (TDG) and aeration, aeration depth and aeration aperture were established respectively.; A quantitative relationship between release coefficient (DO/TDG) and aeration conditions was established.; The root mean square error and the absolute average error were used for error analysis to judge the applicability of the equation. These equations were within 10%.; The relationship between dissolved oxygen (DO) and total dissolved gas (TDG) was established.;
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