“A DESIGN RATIONALE FOR SIPHONING U-TUBE AIRLIFT PUMPS IN CLOSED LOOP RECIRCULATING AQUATIC SYSTEMS”
Abstract:Integrated design strategies in closed loop recirculating aquatic systems (RAS) enables unit operation refinement and process consolidation. With federally mandated increases in the levels of required waste water treatment, continued improvements in their economic competitiveness has resulted in closed loop systems receiving increased application in a wide variety of aquatic industries. The increasing favor of closed loop recirculating systems over open through flow is of substantial significance considering not only the decrease of suitable water supplies, but also the reduction of point source discharges from commercial aquatic operations; an industry that is experiencing rapid and continued growth. The amalgamation of particularly energy intensive operations can considerably cut installation and operational costs associated with recirculating aquatic operations. The novel development of Siphoning U-tube Air-Lift Pumps (SUTA) which utilize air to simultaneously move, oxygenate and strip carbon dioxide from water (characteristically the most energy intensive components of a Recirculating Aquatic Systems) in a single unit operation, significantly reduces the energy requirements of RAS. The amalgamation of such particularly energy intensive operations can considerably cut installation and operational costs associated with closed loop RAS. Integrated design strategies in closed loop recirculating aquatic systems (RAS) enables unit operation refinement and process consolidation. Formal design guidelines were formulated to facilitate the successful transfer of this technology into commercial operations. Standardized design curves were generated, which rate water delivery as a function of operational efficiency. This efficiency is expressed as gas-to-liquid ratios (G/L) and is defined as the rate of water delivery per unit of air supplied to the SUTA pump. These design curves were formulated over range a of head losses that typically occur in the filtration unit processes of closed loop RAS. From these design curves an optimal system geometry and configuration can be selected which will deliver water at a maximum rate of efficiency. In using water delivery rate as a function of the G/L ratio, the rating curves are standardized to a unitless operational parameter that enables direct performance efficiency comparisons across a spectrum of different system configurations.
Document Type: Research Article
Publication date: January 1, 2000
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