Jet aerators

Jet aerators

Jet aerators are devices that efficiently mix and transfer mass, typically used in wastewater treatment. They have hollow jets that can be adjusted to vary the flow characteristics based on the aeration requirements of wastewater with fluctuations in organic load. The jet aerator combines mixed liquor suspended solids (MLSS) and diffused air in a jet to quickly transfer oxygen into the pumped fluid.From: Proceedings of the 44th Industrial Waste Conference May 9, 10, 11, 1989 [1990], Prediction of oxygen mass transfer of plunging hollow jets using regression models [2020], Environmental Pollution Control Microbiology [2019]

Design and Operation of Biological Nitrogen Removal Facilities

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Published in Richard Sedlak, Phosphorus and Nitrogen Removal from Municipal Wastewater, 2018

Richard Sedlak

Facility Description. The Del City WWTP is a 3.0 MGD sequencing batch reactor (SBR) facility which is operated in a nitrogen removal mode for energy conservation purposes and to control sludge settleability. The system consists of preliminary treatment (comminutor and grit removal), the SBR, ultraviolet disinfection, and aerobic sludge digestion. The SBR system consists of two circular basins, each 113 ft. in diameter with a 22 ft. total water depth. The total hydraulic residence time is 26 hours at the design average flow. Mixing and oxygen transfer are provided by jet aerators. Effluent discharge is provided by a floating, submerged, effluent decanter.

Prediction of oxygen mass transfer of plunging hollow jets using regression models

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Journal Information

Published in ISH Journal of Hydraulic Engineering, 2020

Munish Kumar, N. K. Tiwari, Subodh Ranjan

In practical applications, the jet flow characteristics of hollow jet aerators can be varied by simply varying the jet thickness, i.e. jet flow area based on the aeration requirements of wastewater having fluctuations in organic load. For shallow depth aeration tanks having larger surface area, 30° hollow jet aerator is useful in producing much larger interfacial area with the pool water surface, thereby adding more oxygen due to larger expansion of jet, while 60° jet angle hollow aerators can be effective with moderately deeper aeration tanks through which bubbles can penetrate deeper and remain in the liquid for a longer period of time before reaching the surface of water in the pool.

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Design and Operation of Biological Nitrogen Removal Facilities

Prediction of oxygen mass transfer of plunging hollow jets using regression models