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Subject: Fish Processing Technology × Author: MALOTH MOHAN × End date: 2020 × Thesis Type: M.F.Sc ×
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    ThesisItemOpen Access
    STUDY ON THE EFFICIENCY OF FABRICATED AERATORS AND ITS INFLUENCE ON DISSOLUTION OF OXYGEN IN POND WATER
    (KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR, 2019) MALOTH MOHAN; S.VARADARAJU
    In the present study, four different types of aerators were designed and fabricated such as three tier perforated tray aerator, cascading wooden plank aerator, rotating wheel aerator and vertical perforated cylindrical aerator. Experiments have been carried out to check the efficiency of the above aerators and also dissolution of oxygen in pond water during day and night. These experiments have been conducted at the Research and Instructional Fish Farm of the College of Fisheries, Mangaluru. Three uniform square shaped cement ponds of the size (5 × 5 × 1 m) without soil base were selected for conducting the experiments. These fabricated aerators performance evaluation was tested in triplicate using Unsteady-State Test Procedure. Results of these experiments showed that the Standard Oxygen Transfer Rate (SOTR) of vertical perforated cylindrical aerator (Ponds V₁, V₂ and V₃) were recorded as 0.167 kg O2/h, 0.150 kg O2/h and 0.146 kg O2/h respectively. Three tier perforated tray aerator (Ponds T₁, T₂ and T₃) shows the SOTR as 0.165 kg O2/h, 0.156 kg O2/h and 0.142 kg O2/h respectively. In R₁, R₂ and R₃ ponds by using rotating wheel aerator, the SOTR was raised up to 0.107 kg O2/h, 0.102 kg O2/h and 0.099 kg O2/h respectively. The SOTR of cascading wooden plank aerator in the ponds C₁, C₂ and C₃ were 0.097 kg O2/h, 0.084 kg O2/h and 0.077 kg O2/h respectively. From the above results it was noticed that the vertical perforated cylindrical aerator shows better SOTR value followed by three tier perforated tray aerator, rotating wheel aerator and cascading wooden plank aerator. Aeration by using the above aerators increases the dissolution of oxygen during day time, while decrease in dissolved oxygen levels at night was evident. The increased oxygen dissolution during day time was probably due to congenial environmental temperature that complimented the dissolution of oxygen in to pond water. While the drop in environmental