An experimental study of venturi aeration system

Abstract

Aeration with a venturi aerator is efficient method to increase the dissolved oxygen (DO) concentration in water sources like rivers, waterways, ponds and water treatment plants. It is employed in aquatic animals' respiration and other biological processes as well as the removal of dissolved gases, dissolved metals, and volatile organic chemicals (VOC) in water. Aeration system efficiency is a crucial design factor, as aeration systems often account for the most energy draw and consumption. The study aims to evaluate the standard oxygen transfer rate (SOTR), standard aeration efficiency (SAE), volumetric oxygen transfer coefficient (KLa20) of venturi aeration system, air velocity and airflow rates at different water levels of the tank. Venturi aerator designed by Green Pumps and Equipments was used for experimentation. Air entrainment hole was fixed to 25 mm and 66 mm water inlet diameter. It was discovered that the rate of air flow rises as the tank's water level falls. The KLa20 was achieved at a rate of 2.58 h−1, SOTR at a rate of 0.323191 kgO2/hr, and SAE at a rate of 0.293594 kgO2/KWh, respectively. The findings suggest that venturi aeration may have a considerable impact on air entrainment and aeration efficiency. As a result, the venturi aeration system can be employed as an efficient aerator in aeration procedures.