Abstract
Experimental analysis for a fabricated Low-Speed surface aerator that can be used in wastewater and water treatment is presented in this research. The designed impeller configuration was tested to determine its power consumption, standard oxygen transfer rate (SOTR), and standard aeration efficiency (SAE). Impeller oxygen transfer and power consumption in a scaled laboratory tank were measured during aeration phase. The impeller was consisting of 8 inclines flat blades with an angle of 45° from center of the disc, was operated at 3 different immersion depths and 5 different rotational speeds for examining the impact of such factors on impeller efficiency. The results recorded that the best standard aeration efficiency for this configuration is (0.206 Kg. O2/KW.hr) at 120rpm and 7cm depth of the submersion, i.e. submersion depth to impeller diameter (h/D) ratio equals 0.175. Submergence depth increase beyond this limit would result in SAE decrease and definitely result into more power consumption.
Highlights
Aeration is one of the important processes conducted in wastewater and water treatment
15 experiments were conducted with different submersion depth and speeds, dissolved oxygen concentrations (DO) and power consumption were measured and recorded at a fixed height of water of 50 cm
Experiments have been carried out to investigate the effects of different factors on AE and oxygen transfer rate in a mechanical surface aerator, with the following results: 1. The standard aeration efficiency and overall coefficient of the oxygen transfer KLa are affected by the aerator's relative submersion depth in the water
Summary
Aeration is one of the important processes conducted in wastewater and water treatment. This process' primary goal is transferring oxygen from atmosphere to water. Because of a low oxygen transfer rate and poor solubility of oxygen, enough oxygen to supply the aerobic waste demands doesn't enter through the natural air-water interface, making such process an important aspect of treatment. The aeration approach is utilized for adding more interfaces as well as boosting oxygen transfer rates such that dissolved oxygen rises to a particular level, allowing aerobic bacteria for removing the effluent's biochemical oxygen need. A variety of aeration systems were developed and implemented. The aeration systems divided into five major groups as listed below:
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