Oxygen transfer model development based on activated sludge and clean water in diffused aerated cylindrical tanks

Comparison of empirical correlations for the estimation of the oxygen transfer coefficient in an aerobic bioprocess

“…), superficial area (" ) and depth (_ ) of the diffusers, bubble diameter ( " ), and dynamic viscosity in a cylindrical reactor aerated by diffusion. The correlation for clean water is (15) and for water with activated sludge is (16) [13]. 0.03 0.06…”

“…In 2014, Pittoors et al [13] proposed empirical correlations to determine the volumetric oxygen transfer coefficient in clean water and activated sludge water. These correlations are given in terms of volume (6 ), height (_ ), diameter (8 ) and cross-sectional area (" ) of the tank, air volumetric flow rate ( ?…”

“…The three empirical correlation to estimate the oxygen transfer coefficient were proposed by different authors between 2006 and 2014 in [11], [12] and [13], respectively. The main feature to note about these correlations is that are written in terms of the reactor geometric parameters, allowing an easier comparison from each other.…”

CFD simulation and optimization of membrane scouring and nitrogen removal for an airlift external circulation membrane bioreactor

“…The oxygen transfer rate (OTR) corresponding to _ m q i p j in Eq. (3) can be expressed as (Pittoors et al, 2014) OTR…”

“…Volumetric oxygen transfer rate (OTR) coefficient, k L a, is usually used for the description of oxygen source (Cockx et al, 2001). It is affected by many factors, such as configuration of bioreactor, surface tension, viscosity, temperature, and most importantly, the aeration condition including aeration intensity (Pittoors et al, 2014), aeration pattern (Capodici et al, 2015), bubble diameter and bubble shape (De Temmerman et al, 2015) and hydrodynamics (Braak et al, 2011). More than that, k L a is affected by the solution composition, biomass concentration and sludge rheological property in wastewater treatment systems (Pittoors et al, 2014).…”