Study of different flexible aeration tube diffusers: Characterization and oxygen transfer performance

Hongprasith, Narapong; Dolkittikul, Natchanok; Apiboonsuwan, Kamolnapach; Pungrasmi, Wiboonluk; Painmanakul, Pisut

doi:10.4491/eer.2015.082

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…The k L a 20C and AE were used for comparing and evaluating the oxygen transfer performance, as shown in the As shown in Figure 3.8-a, it was found that the values of k L a 20C obtained with the mechanical surface aerator (around 0.3-1.0 1/hr) were greater than those obtained with the LFFA system with stone tube diffuser by about 2 or 3 times (around 0.1-0.3 1/hr). The bubble size and related rising velocity were 3-5 mm and 21-28 cm/s, respectively [2]. According to the results from flexible tube diffuser, it can be noted that similar trend with paddle wheel aerator was observed (0.3-0.8 1/hr).…”

Section: Comparison Of Lffa and Mechanical Surface Aerator In Real Op...supporting

confidence: 61%

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Combination of Surface and Diffused Aerators in Term of Oxygen Transfer Efficiency and Energy Performance

Hongprasith

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Paddle wheels are widely used in aquaculture pond in Thailand due to convenient installation and operation, with an ability to supply oxygen together with making water circulation as their advantage. But the low oxygen transfer efficiency (OTE) and energy performance (Aeration efficiency, AE) should be considered as the main drawback of this aerator type, because they can make a contacting area between air (oxygen) and water at the water surface only. While diffused aerators present a high OTE and AE. However, their mixing performance in the vertical direction is not enough for a large aquaculture pond. Then it is necessary to apply another equipment to perform water flow or horizontal water circulation, such as axial propellers, water pump, or paddle wheels. To fulfill this gap, a combination aeration system was setup by combining the diffused aerators and water pumps: diffused aerators play the role for an oxygen transfer mechanism, while water pumps creating a horizontal circulation for the oxygen distribution. It was found that the highest AE (0.47 kg-O2/kW-hr) was obtained when applying 57 mm/s of the horizontal water velocity during the aeration by 2 sets of the flexible rubber tube diffuser. This AE value was closed to 0.51 kg-O2/kW-hr of 3 sets of diffusers, and higher than a system contained by 2 units of 60W water pumps, (which represented as a paddle wheels system) up to 47 times. The uniform DO distribution was obtained by 57 mm/s of the horizontal water velocity, and the improvement of oxygen transfer was obtained by reducing of bubble size (dB) and their rising velocity (UB) which can produce more interfacial area (a-area) up to 278%. Moreover, both of oxygen transfer parameters and bubble hydrodynamic parameters can be predicted accurately by the theoretical prediction models with an error lower than 10% for the combination aeration system that can be used as a criterion for the aeration system design.

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Section: Comparison Of Lffa and Mechanical Surface Aerator In Real Op...supporting

confidence: 61%

“…However, this result is specific for the flexible rubber tube only, so this topic has to be studied for further about oxygen transfer mechanism through bubble hydrodynamic parameters observation, and enlarge scope into other types of diffuser for several applications [2].…”

Section: Literature Reviewmentioning

confidence: 99%

Combination of Surface and Diffused Aerators in Term of Oxygen Transfer Efficiency and Energy Performance

Hongprasith

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“…Oxygen concentration can be estimated in a theoretical way as in equation no (1) [6,12] There are many types of aeration systems to supply oxygen to the biological pool as follows:…”

Section: • Aeration Systemmentioning

confidence: 99%

Study of Change Surface Aerator to Submerged Nonporous Aerator in Biological Pond in an Industrial Wastewater Treatment in Daura Refinery

Waheeb¹,

Salman²,

Kadhim³

2022

Wastewater Treatment

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Daura refinery, with a capacity of 140,000 barrel per stream day as a refining capacity, wastewater discharged from refining and treatment processing units, polluted water as foul water, drainages, oil spills, blowdown of boilers and cooling towers, and many other polluted water sources, aims to remove pollutants and reject clean water to the river; wastewater treatment system takes place in this treatment process. Wastewater treatment system suffers from many problems and specifically biological stage; at this stage, activated sludge with bacteria, should be supplied with oxygen, aeration system done by surface aerators with four surface fans; these fans suffer from high vibration, loss support, and in consequence, lack in oxygen supply to aerobic bacteria less than 4 ppm. The nonporous aerator is suggested as an oxygen source for the biological pool. The pilot plant builds the aim to study the ability to apply the new aeration system at the biological pool, pilot plant build with 1 cubic meter capacity tank and continuous overflow of wastewater of 10 liters.min−1, air injected with the pressure of (0.5–0.75) bar(g), and airflow of (7.6–9.7) liter.min−1 respectively. Oxygen concentration was recorded as (3.4–6.0) ppm; in terms of consumption power, changing the aeration system reduces it to less than 20%.

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Experimental and empirical investigation of mass transfer enhancement in multi-scale modified airlift reactors

Bun

Chawaloesphonsiya

Ham

et al. 2019

Multiscale and Multidiscip. Model. Exp. and Des.

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Study of different flexible aeration tube diffusers: Characterization and oxygen transfer performance

Cited by 9 publications

References 9 publications

Combination of Surface and Diffused Aerators in Term of Oxygen Transfer Efficiency and Energy Performance

Combination of Surface and Diffused Aerators in Term of Oxygen Transfer Efficiency and Energy Performance

Study of Change Surface Aerator to Submerged Nonporous Aerator in Biological Pond in an Industrial Wastewater Treatment in Daura Refinery

Experimental and empirical investigation of mass transfer enhancement in multi-scale modified airlift reactors

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