Vol. 12, Issue 3 (2023)

Author(s):
Dibakar Mohodi and Amarjyoti Khound

Abstract:
Column diffuse aeration experiments were conducted in two types of aeration tank i.e., semi open and fully open tank with 200 L capacities sintex-renotuff water tank made up of FDA grade materials to study the effects of variable geometric parameter of total hole surface area (10%, 20% and 30%), diffuser pipe diameter (1.27 cm, 1.91 cm and 2.54 cm) and diffuser hole diameter (0.2 cm, 0.4 cm and 0.6 cm) on standard aeration efficiency (SAE). To evaluate the optimum condition among above three geometric parameter at a time one of each is kept constant while other two parameter were remained varied. The comparison result for semi open aeration tank and fully open aeration tank showed that the values of standard oxygen transfer rate (SOTR) and standard aeration efficiency (SAE) for fully open aeration tank was always maximum than semi open aeration tank. The standard aeration efficiency for both semi open and fully open aeration tank varies from 0.0111 Kg O₂/KWh to 0.0230 Kg O₂/KWh and 0.0104 Kg O₂/KWh to 0.0245 Kg O₂/ KWh respectively. Besides this, the best result drawn in this investigation for the standard aeration efficiency for fully open aeration tank is found as 0.0245 Kg O₂/ KWh at optimum geometric parameter of diffuser pipe diameter (DPD) of 1.27 cm hole diameter (DHD) of 0.2 cm and hole surface area (THSA) of 30% while for semi open aeration tank it is found as 0.0230 Kg O₂/KWh under optimum geometric parameter of hole diameter of 0.2 cm and hole surface area of 30% respectively.