Multiphase reacting flow studies of bubble column ozonation reactor for water remediation

Abstract

A multiphase Volume-of-fluid (VOF) model was developed to gain further insights into the reactive flow parameters and electrical capacitance tomography (ECT) measurements on the remediation of hazardous organic pollutants. Low ozone bubble frequencies were obtained for high surface tension fluids, and the liquid viscosity affected the ozone bubbling frequency. The VOF model indicated that the increase of inlet gas velocity enriched the ozone bubble detachment and concomitantly generated larger ozone bubbles, decreasing the detoxification rates. VOF mappings and ECT visualizations of gas-liquid unveiled preferential routes and highlighted the attenuation of the axisymmetric behavior of the ozonation bubble column under high-interaction regimes.

Analysis of Ozonation Processes Using Coupled Modeling of Fluid Dynamics, Mass Transfer, and Chemical Reaction Kinetics

“…Once it reached the top of the reactor, the liquid flow then moved downward along the side of the reactor to form a recirculation flow across the reactor. The velocity magnitude of the liquid phase in the ozone reactor was in the range of 0.05 to 0.3 m s −1 with these values typical of both bubble column and chamberin-series types of ozone reactors, 14,41,42 indicating that the model in this study can be applied to other ozonation reactors.…”

Linear Stability Analysis for a Reactive, Multiphase Bubble Column

“…Reactive bubble columns have become an increasingly important area of research in several diverse engineering applications, including water purification, aromatic oxidation, and industrial solvent remediation . Numerous computational strategies have been proposed, , including multiscaled approaches. , Recently, the authors have begun investigating transport-assisted microorganism growth, specifically of algae, by increasing the mass transfer between bubbled carbon dioxide (CO 2 ) in the gaseous phase and the microorganisms in an aqueous liquid phase. , In this way, the efficiency of continuous systems can be combined with enhanced mass transfer in a bubble column.…”

Optimization of the Continuous Polycondensation Process for Polyethylene Adipate

“…The result of preliminary experiments showed that the total reaction time of PEA production in a BRDT was within 6–7 h but it often took more than 13 h, even up to 24 h, for the same product quality with present popular industrial batch‐tank technology 7. The BRDT presented a multistage bubble column containing several reaction trays with special construction, thereby providing significant advantages during operation and maintenance such as high operating flexibility, high heat and mass transfer rates, compactness, and low operating and maintenance costs 8, 9. In continuous operation, monomers or molten oligomers flowed through each heated tray from the top to the bottom by gravity, without agitation, and were discharged from the bottom of the column, while vapor passed through the trays from the bottom to the top as reaction by‐product.…”