The phrase "air aeration" is not correct and is redundant in written English.
It can be used when discussing the process of introducing air into a liquid, but the repetition makes it unnecessary.
Example: "The air aeration process is crucial for maintaining the health of the aquatic ecosystem."
Alternatives: "oxygenation" or "aeration process".
These include diffused air aeration, mechanical aerators, and process design.
Among the four variables, glycerol and rate of stirring significantly affected 1,3-PD productivity, whereas air aeration and pH were not effective.
The optimum combinations for 1,3-PD productivity was glycerol, rate of stirring, air aeration, and pH of 50 g/l, 318 rpm, 0.6 vvm, 6.48, respectively.
A central composite design was used to study the effect of glycerol, rate of stirring, air aeration and pH on the synthesis of 1,3-propanediol (1,3-PD) by Klebsiella pneumoniae AC 15.
Initial medium volume was 3 L, and air aeration rate was 1.33 vvm.
The results show that the addition of the low-cost antioxidant sodium erythorbate (8 g L−1) significantly accelerates the growth of microalgae in the first stage with air aeration.
PS content in EPS declined from 27.0 to 14.3 mg/gMLSS at air intensive aeration rate of 50 L/h, while it declined to 37.9 and 43.1 mg/gMLSS at air intensive aeration rate of 150 and 200 L/h.
The governing parameters of the flow were established as the solid feeding flow rate, the fluidisation velocity, the solids holdup, the freeboard pressure and the secondary air injection (aeration) velocity.
The bioreactor was sparged with atmospheric air maintaining aeration of 1 volume per volume per minute (vvm) (1 standard liter per minute (slpm)).
However, PS content under different air intensive aeration rates changed a lot).
The granules reactivated at air intensive aeration rate of 100 L/h achieved better settling property and contaminants removal efficiency.
