Study on oxygen transfer by solid jet aerator with multiple openings

Shukla, Bishnu Kant; Goel, Arun

doi:10.1016/j.jestch.2018.03.007

Cited by 27 publications

(18 citation statements)

References 12 publications

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“…The liquid flowing through such a nozzle ensures the turbulization of the jet before it leaves the nozzle, which can lead to its higher injecting capacity. Abaev, Safronova, and others came to the same conclusion [20,21,22].…”

Section: Introductionmentioning

confidence: 52%

Sizes of the actively aerated zone and methods of the jet aerator calculation

et al. 2021

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The possibilities of using jet aeration for biological wastewater treatment in small facilities were considered in the article. In shallow depth reservoirs, studies were carried out to change the sizes of the actively aerated zone with a decrease in the height of the liquid layer in the reservoir. The research was conducted for jet aerators with nozzles of the "keyway" type holes. It was established that a decrease in the relative depth of the reservoir makes it possible to increase the share of the beneficial use of the reservoir volume. This suggests that jet aeration will be most effective for reservoirs of relatively shallow depth. Based on the research results, a method for calculating a jet aerator was proposed, which makes it possible to evaluate the necessary parameters of the aerator based on the determination of the volumetric mass transfer coefficient.

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Section: Introductionmentioning

confidence: 52%

Sizes of the actively aerated zone and methods of the jet aerator calculation

et al. 2021

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“…The The loss function has initiated due to sudden contraction from the tap area to the nozzle aerator entry because of the reduction in diameters of aerator rear side entry from the pipeline. By using the reduction of loss due to sudden contraction is mentioned by this equation, Q=A1V1 and Q=A2V2 (3) where," v" velocity of flow; "g" force due to gravity; hc is contraction loss in the pipeline.…”

Section: Figure 9 Holes At the Backside Of The Nozzle Aerator For Various Diametersmentioning

confidence: 99%

“…They found that the trapezoidal rib showed the best performance with the Reynolds Number ranging from 100 to 900. Shukla et al [3] discussed that the increase in the number of openings and the increase in total surface area of openings used to elevate the discharge with the increase in oxygen transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Comparative design and CFD analysis of 3-D printed acrylonitrile butadiene styrene nozzle aerator for discharge reduction

Bejaxhin

Basavaraj²,

Köten

et al. 2022

THERM SCI

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The flow nozzle aerator, which is the part of the water tap made up of Acrylonitrile Butadiene Styrene (ABS), can be modified entirely with a new design. The curved and cone-shaped slopes are used to improve the smooth flow at uniform velocity. Simultaneously, discharge is optimum by modified interior design. The smooth laminar delivery of water with optimum pressure, the liquid element at the aerator end becomes smooth. The assembled nozzle aerator solid model has been generated before experimentation. This can promote through the prediction by the modern tool ANSIFLUENT and Computational Fluid Dynamics (CFD) for finding the flow behavior and its outlet characters. The solid model can be fabricated to prototype for accurate dimensions by using 3D printing technology. Comparing fluid motion with the time consumption of filling water has been done over these different kinds of aerator and nozzle models, which are fabricated by 3-dimensional printing.

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“…Aeration by pressurized air (jet aerators) [8,9]: In the mixing chamber, water and air are in close contact at relatively high pressure, so that the water becomes supersaturated and is then expunged by a jet diffuser. The drawback is that this water is introduced into the water body quite wildly, and therefore the risk of resuspending and perturbing the top sediment is non-negligible.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study on Mini-Modus Device Designed to Oxygenate Bottom Anoxic Waters without Perturbing Polluted Sediments

Perin

Romagnoli

Perin³

et al. 2020

Environments

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The Tangential Guanabara Bay Aeration and Recovery (TAGUBAR) project derives its origins from a Brazilian government decision to tackle the planning and management challenges related to the restoration of some degraded aquatic ecosystems such as Guanabara Bay (state of Rio de Janeiro), Vitória Bay, and Espírito Santo Bay (state of Espírito Santo). This was performed by using the successful outcomes of a previous Ministry of Foreign Affairs and Directorate General for Cooperation and Development (i.e., Direttore Generale alla Cooperazione allo Sviluppo, MFA–DGCS) cooperation program. The general objective of the program was to contribute to the economic and social development of the population living around Guanabara, Vitória, and Espírito Santo Bays, while promoting the conservation of their natural resources. This objective was supposed to be achieved by investing money to consolidate the local authorities’ ability to plan and implement a reconditioning program within a systemic management framework in severely polluted ecosystems such as Guanabara Bay, where sediments are highly contaminated. Sediments normally represent the final fate for most contaminants. Therefore, it would be highly undesirable to perturb them, if one wishes to avoid contaminant recycling. In this context, we explored a bench-scale novel technology, called the module for the decontamination of units of sediment (MODUS), which produces an oxygenated water flow directed parallel to the sediment floor that is aimed to create “tangential aeration” of the bottom water column. The purpose of this is to avoid perturbing the top sediment layer, as a flow directed toward the bottom sediment would most probably resuspend this layer. Three kinds of tests were performed to characterize a bench-scale version of MODUS (referred to as “mini-MODUS”) behavior: turbulence–sediment resuspension tests, hydrodynamic tests, and oxygenation–aeration tests. In order to understand the functioning of the mini-MODUS, we needed to eliminate as many variables as possible. Therefore, we chose a static version of the module (i.e., no speed for the mini-MODUS as well as no water current with respect to the bottom sediment and no flume setting), leaving dynamic studies for a future paper. The turbulence tests showed that the water enters and exits the mini-MODUS mouths without resuspending the sediment surface at all, even if the sediment is very soft. Water flow was only localized very close to both mouth openings. Hydrodynamic tests showed an interesting behavior. An increase of low air flows produced a sharp linear increase of the water flow. However, a plateau was quickly reached and then no further increase of water flow was observed, implying that for a certain specific geometry of the equipment and for the given experimental conditions, an increase in the air flow does not produce any reduction of the residence time within the aeration reactor. Oxygenation–aeration tests explored three parameters that were deemed to be most important for our study: the oxygen global transfer coefficient, KLa; the oxygenation capacity, OC; and the oxygenation efficiency, OE%. An air flow increase causes an increase of both KLa and OC, while OE% decreases (no plateau was observed for KLa and OC). The better air flow would be a compromise between high KLa and OC, with no disadvantageous OE%, a compromise that will be the topic of the next paper.

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Study on oxygen transfer by solid jet aerator with multiple openings

Cited by 27 publications

References 12 publications

Sizes of the actively aerated zone and methods of the jet aerator calculation

Sizes of the actively aerated zone and methods of the jet aerator calculation

Comparative design and CFD analysis of 3-D printed acrylonitrile butadiene styrene nozzle aerator for discharge reduction

Preliminary Study on Mini-Modus Device Designed to Oxygenate Bottom Anoxic Waters without Perturbing Polluted Sediments

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