SSiiddeewwaallll--BBooxx AAiirrlliifftt PPuummpp PPrroovviiddeess LLaarrggee FFlloowwss ffoorr AAeerraattiioonn,, CCOO 22 SSttrriippppiinngg,, aanndd WWaatteerr RRoottaattiioonn iinn DDuuaall--DDrraaiinn CCiirrccuullaarr TTaannkkss Steven Summerfelt & Dane Schiro Freshwater Institute, Shepherdstown, WV Timothy Pfeiffer USDA ARS, Fort Pierce, FL OObbjjeeccttiivveess Develop a simplified partial water reuse system  that relies on a sidewall-box airlift pump reduce variable and fixed costs  simple system  does not compromise water quality  2 IInnttrroodduuccttiioonn –– AAeerraattiioonn OOppttiioonnss Diffused aeration in circular tanks  interferes with: hydrodynamics of water rotation  speed and efficiency of solids  fractionation to the bottom-center drain 3 CCiirrccuullaarr TTaannkkss:: RRaaddiiaall FFllooww Primary rotating flow creates secondary radial flow:  transports settleable solids to bottom center  creates self-cleaning tank  aeration breaks apart fecal matter and interferes w/ hydrodynamics  4 MMeetthhooddss:: SSiiddeewwaallll BBooxx AAiirrlliifftt 1st Version used a 30 cm (12 inch) wide weir wall  180 cm2 (0.196 ft2) plan area in airlift chamber  Three snap-cap diffusers (Aquatic-Eco Systems)  Courtesy of Red Ewald, Inc. 5 MMeetthhooddss:: SSiiddeewwaallll BBooxx AAiirrlliifftt 1st Version used a 30 cm (12 inch) wide weir wall  6 MMeetthhooddss:: SSiiddeewwaallll BBooxx AAiirrlliifftt 2nd Version used a 46 cm (18 inch) wide weir wall  2060 cm2 (2.25 ft2) plan area = 10-times more airlift area  diffuser grid w/ 1.2 m of Aero-Tube Tubing (Colorite Plastics)  Courtesy of HE Products foam outlet skim mer airlift inlet 7 MMeetthhooddss:: SSiiddeewwaallll BBooxx AAiirrlliifftt 2nd Version used a 46 cm (18 inch) wide weir wall  Courtesy of HE Products INLET OUTLET INLET OUTLET OUTLET 8 MMeetthhooddss:: SSiiddeewwaallll BBooxx AAiirrlliifftt Process flow diagram  11.5 m3 culture tank (3.66 m dia x 1.22 m deep) 80 kg/m3 rainbow trout Standpipe Discharge Standpipe Discharge Airlift Air Blower 9 MMeetthhooddss:: RReeggeenneerraattiivvee BBlloowweerrss 1st Airlift: 0.25 KW (1/3-HP) blower  Model S21, Aquatic-Eco Systems, Boca Raton, Florida  2nd Airlift: 0.38 KW (1/2-HP) blower  Model S31, Aquatic-Eco Systems  10