Abstract
Vortex flow regulators (VFR) are used in urban drainage systems as a replacement for traditional flow throttling devices. Vortex regulators are not only very efficient energy dissipators but also atomizers which are beneficial for sewer aeration. A deficit of dissolved oxygen can be a problem in both natural waters and sewerage. Hydrodynamic flow regulators can boost oxygen concentration preventing putrefaction and improving treatment of stormwater and wastewater. We were first to investigate the aeration efficiency of semi-commercial scale cylindrical vortex flow regulators to determine the potential of their application in environmental engineering and to propose modification to enhance the aeration capacity of basic designs. Different device geometries and arrangements of active outlets for both single and double discharge vortex regulators were tested in a recirculating system. In this study, we present a concise review of the current state of our extensive research on the aeration efficiency of vortex flow regulators and their application in sewerage systems.
Highlights
Vortex flow regulators (VFR) are used in urban drainage systems as a replacement for traditional flow throttling devices
We aim to present the current state-of-the-art cylindrical vortex regulator (CVR) designs and a concise summary of several years of research on aeration efficiency of vortex flow regulators
We found that the oxygen transfer coefficient and the oxygen transfer rate (SOTR) are in direct proportion to the flow rate and that all regulators types follow the same trend
Summary
Vortex flow regulators (VFR) (known as hydrodynamic flow regulators) are used in urban drainage systems as a replacement for traditional flow throttling devices. Vortex regulators are very versatile and can be used in gravitational as well as pressurised systems with different configurations. Their application is not limited to storm or wastewater systems. They can be used in other fields too, e.g. in water distribution – for water hammer protection or in hydraulic structures – for limiting outflow from a dam [1]. From a practical point of view, vortex regulators are compact, efficient in throttling, reliable and free from common disadvantages of the traditional regulation devices. Vortex devices are fascinating with their simple design and straightforward operational principle, as opposed to a highly complex vortex motion employed, which defies a complete solution for over 100 years [2,3,4,5]
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