Location: Warmwater Aquaculture Research UnitTitle: Performance evaluation of pumping systems used in commercial-scale, split-pond aquaculture Author
Submitted to: Annual Meeting World Aquaculture Society
Publication Type: Abstract Only
Publication Acceptance Date: 9/1/2015
Publication Date: 2/2/2016
Citation: Brown, T.W., Tucker, C.S. 2016. Performance evaluation of pumping systems used in commercial-scale, split-pond aquaculture. Annual Meeting World Aquaculture Society. P. 114.
Technical Abstract: Split-pond aquaculture systems have been adopted widely by United States catfish farmers as a way to improve production performance. The split-pond consists of a fish-culture basin that is connected to a waste-treatment lagoon by two water conveyance structures. Water is circulated between the two basins with high-volume pumps and many different pumping systems are being used on commercial farms. Pump performance was evaluated with four different pumping systems. Rotational speeds ranged from 0.5 to 3.5 rpm for a twin, slow rotating paddlewheel pump; 12.5 to 56.5 rpm for a paddlewheel aerator pump; 60 to 240 rpm for a high-speed screw pump; and 150 to 600 rpm for an axial-flow pump. Water flow rates ranged from 8.6 to 77.6 m3/min and increased with increasing rotational speed. Power input varied directly with flow rate and ranged from 0.24 to 13.43 kW for all four pumps. Water discharge per unit power input (i.e., pumping efficiency) ranged from 3.5 to 70.9 m3·min-1·kW-1 for the pumps tested. In general, pumping efficiency decreased as water flow rate increased. Initial investment cost for each pump and complete pumping system ranged from US$5,850 to $22,900, and $15,335 to $78,660, respectively. The least expensive pump to operate was the twin, slow-rotating paddlewheel pump, followed by the paddlewheel aerator pump, high-speed screw pump, and axial-flow pump (Fig. 1). Our results show that four different pumping systems can be effectively installed and used to circulate water in split-ponds, although water flow rate, rotational speed, required power input, efficiency, initial investment cost, and operational expense varied greatly between the pumping systems tested. Long term studies are underway to better define the relationship between water flow rate and fish production in split-ponds. That information will help identify the pumping system most appropriate for split-pond aquaculture.