USE OF HYDRAULIC PHENOMENA IN ENHANCEMENT OF DISSOLVED OXYGEN CONCENTRATION

Rajkumar V. Raikar, Poornima B. Kamatagi

Abstract: The dissolved oxygen (DO) content of water bodies is an indicator of water quality and hence a measure of ability of water to sustain aquatic life. Hydraulic phenomena such as hydraulic drops and hydraulic jumps can increase the amount of DO in the water by creating turbulent conditions. The main reason for this oxygen transfer is the air entrainment into the flow through large number of air bubbles that helps in air-water transfer. The present study investigates the effect of different weir types and hydraulic jump on their aeration efficiency. Two types of weirs namely rectangular and triangular weirs were used in the study. Also, the hydraulic jump was studied as an aeration agent. From the experimental results, it was found that the triangular weir provides greater aeration efficiency of 0.1948 as compared with rectangular weir that had aeration efficiency of 0.1012. On the other hand, the hydraulic jump showed aeration efficiency of 0.14285. As the weirs are more efficient than hydraulic jump, they are most applicable in the field. Also, weir structures are less expensive when compared with the structural arrangement required for the formation of hydraulic jump

Keywords: Dissolved oxygen, Aeration efficiency, Weir, Hydraulic jump

DOI: https://doi.org/10.15623/ijret.2015.0402078