Abstract
The reduction of dissolved oxygen (DO) in water is associated with the effect of climate change. The lack of oxygen in water bodies directly affects the biological species present in different shallow water bodies such as swamps and wetlands, as well as in aquaculture processes. An optimal value in the DO concentration favors the reproduction of these biological species present in both artificial and natural environments. For this, various equipment has been developed to favor the increase of DO in the water to acceptable values. However, some of these systems are expensive, energy inefficient, and noisy which generate adverse impacts in aquatic ecosystems due to perturbances in the water. This study measures the efficiency (KgO2·kWh-1) of introducing DO into the water using a paddle wheel aerator system at low RPMs destined for shallow bodies of water. Tests were performed on anoxic water samples using aerators with 6, 12, and 24 paddles at the laboratory level. By increasing the voltage (6, 9, and 12V), the RPMs applied to each device through a geared motor is also increased. The results show a higher DO transfer rate in the 1 and 5 mg of O2·L-1 range. The best configuration concerning energy consumption worked at low RPMs using the 6-paddle wheel aerator at 6V. This establishes that, in addition to the management of low revolutions, the use of a smaller number of wheels favors an increase in efficiency during the DO restoration process in shallow water bodies.
Highlights
Materials and experimental detailsAeration processes are a key factor for the treatment and restoration of wastewater, favoring bacterial growth, mineralization, and the removal of most contaminants present in wastewater [1]
Standard Oxygen Transfer Rate (SOTR) shows the amount of dissolved oxygen (DO) that has been transferred in the system per unit of time, which is calculated as follows: Where: = Volumetric mass transfer coefficient (°C-1), at 20 °C. = Saturation concentration for a steady-state
The results show that the application of a low voltage decreases the speed of rotation in each of the devices, decreasing the percentage of DO transfer in the water and resulting in a lower efficiency [20]
Summary
Materials and experimental detailsAeration processes are a key factor for the treatment and restoration of wastewater, favoring bacterial growth, mineralization, and the removal of most contaminants present in wastewater [1]. The purpose of this study seeks to measure the efficiency of DO transfer in shadow water samples concerning energy consumption of a rotating agitation system by varying the power supplied and the number of paddles within the device.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have