Methodology to conserve energy in surface aerators

Based on the simulation equations, which were developed earlier (Rao, 1999 and Rao et al., 2007) relating the oxygen transfer coefficient k (= K-La20 (upsilon/g(2))(1/3)) with theoretical power per unit volume of water X (= (ND2/)-D-3/g(4/3)upsilon(1/3)) and k with actual power consumed by the surface aerators per unit volume P-nu (= P/(V gamma(g upsilon)(1/3)), methodology has been demonstrated to the save the energy consumption, defined by epsilon (=P-V/k), where K-La20 is the overall oxygen transfer coefficient at 20 degrees C, v is kinematic viscosity of the water, N is the speed of the rotor, D is the diameter of the rotor, P is the input power available to the rotor, V is the volume of water and gamma is the specific weight of the water. Present works demonstrate that while aerating a given volume of water at constant rotor speed to achieve a desired oxygen transfer coefficient (k) in square tank surface aerator, it is always economical to use a single tank rather than using a multiple numbers of smaller tanks.