title: Optimization of Energy Consumption and Mass Transfer Parameters in a Surface Aeration Vessel.
abstract: This paper reports tests on a lab-scale surface aeration vessel was equipped with a Rushton turbine to examine its performance in terms of standard aeration efficiency (SAE), mixing time, and void fraction characteristics. These characteristics were investigated by tests using variations of rotor speed, impeller immersion depth, and water level. Results showed that variation of impeller immersion depth had a greater effect on the SAE compared to variation of water level. Moreover, the SAE increased with rotor speeds up to about 150 to 200 rpm and then decreased. In addition, void fraction improved by impeller immersion depth and rotor speed enhancement; however, mixing time and power number were reduced as rotor speed increased. According to the response surface methodology statistical optimizations, optimum values for rotor speed, impeller immersion depth, and water level were 168.90 rpm, 25 mm, and 30 cm, respectively, to achieve the maximum value of SAE.
authors.affiliation: Center of Excellence in Design and Optimization of Energy Systems (CEDOES), School of Mechanical Engineering College of Engineering University of Tehran P.O.Box: 11155-4563 Tehran, Iran.
authors.forename: A
authors.initials: A
authors.lastname: Mohammadpour
authors.forename: M A
authors.initials: MA
authors.lastname: AkhavanBehabadi
authors.forename: M
authors.initials: M
authors.lastname: Ebrahimzadeh
authors.forename: M
authors.initials: M
authors.lastname: Raisee
authors.forename: A R
authors.initials: AR
authors.lastname: MajdiNasab
authors.forename: M
authors.initials: M
authors.lastname: Nosrati
authors.forename: S M
authors.initials: SM
authors.lastname: Mousavi
mesh_terms: D019149:Bioreactors; D010100:Oxygen / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000295:instrumentation* / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D018508:Water Purification
chemical_list: D010100:Oxygen; D062065:Wastewater