Hydrodynamics and mass transfer of concentric-tube internal loop airlift reactors: A review

Li, Lifeng; Xu, Xiaoyun; Wang, Wujun; Lau, Raymond; Wang, Chi-Hwa

doi:10.1016/j.biortech.2022.127451

Cited by 17 publications

(5 citation statements)

References 142 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[8,20] The hydrodynamics and mass transfer characteristics in ALRs have been extensively studied. [19,[21][22][23][24][25][26][27][28][29][30][31][32][33][34] How to enhance the mass transfer performance of ALRs is becoming an important issue in practical applications. In gas-liquid two-phase flow, the interphase mass transfer is dependent on the mass transfer rate and specific interfacial area.…”

mentioning

confidence: 99%

Gas holdup, bubble size distribution, and mass transfer in an airlift reactor with ceramic membrane and perforated plate distributor

et al. 2023

View full text Add to dashboard Cite

The airlift reactor is one of the most commonly used gas–liquid two‐phase reactors in chemical and biological processes. The objective of this study is to generate different‐sized bubbles in an internal loop airlift reactor and characterize the behaviours of the bubbly flows. The bubble size, gas holdup, liquid circulation velocity, and the volumetric mass transfer coefficient of gas–liquid two‐phase co‐current flow in an internal loop airlift reactor equipped with a ceramic membrane module (CMM) and a perforated‐plate distributor (PPD) are measured. Experimental results show that CMM can generate small bubbles with Sauter mean diameter d32 less than 2.5 mm. As the liquid inlet velocity increases, the bubble size decreases and the gas holdup increases. In contrast, PPD can generate large bubbles with 4 mm < d32 < 10 mm. The bubble size and liquid circulation velocity increase as the superficial gas velocity increases. Multiscale bubbles with 0.5 mm < d32 < 10 mm can be generated by the CMM and PPD together. The volumetric mass transfer coefficient kLa of the multiscale bubbles is 0.033–0.062 s−1, while that of small bubbles is 0.011–0.057 s−1. Under the same flow rate of oxygen, the kLa of the multiscale bubbles increases by up to 160% in comparison to that of the small bubbles. Finally, empirical correlations for kLa are obtained.

show abstract

mentioning

confidence: 99%

Gas holdup, bubble size distribution, and mass transfer in an airlift reactor with ceramic membrane and perforated plate distributor

et al. 2023

View full text Add to dashboard Cite

show abstract

“…An internal‐loop airlift reactor is composed of two concentric tubes. [ 21 ] The aerobic three‐phase airlift fluidized bed reactors with internal circulation (ATPAFBRWIC) use the action of the biofilm attached to a mobile carrier and have as advantages the use of little space, the retention of a large concentration of active biomass, as well as the simultaneous removal of carbonaceous and nitrogenous matter. [ 22 ] The system is highly efficient due to the large reactor biomass concentration (30–90 kg m −3 ) and to the intimate contact between biomass and substrate created by high upflow liquid velocities (5–10 m h −1 ).…”

Section: Introductionmentioning

confidence: 99%

Organic matter and nutrients removal from landfill leachate by airlift aerobic three‐phase fluidized bed reactor

Pantoja‐Quiroz,

Burbano‐Moreno,

Sánchez Ortiz

2023

CLEAN Soil Air Water

View full text Add to dashboard Cite

The treatment of leachate from the Antanas Landfill in the municipality of Pasto, Colombia, was evaluated by means of aerobic three‐phase airlift fluidized bed reactors with internal circulation (ATPAFBRWIC) with an external and internal diameter ratio of 2 and an individual effective volume of 53 L. Silica sand was used as a carrier at a concentration of 104 g L−1, and the reactors were operated with hydraulic retention times (HRT) of 1, 2 and 4 h. For a period of 45 days, the following parameters were monitored at the influent and effluent of the reactors: biochemical oxygen demand (BOD), chemical oxygen demand (COD), total phosphorus (TP), total ammonia nitrogen (TAN), total Kjeldahl nitrogen, nitrites and nitrates, where the respective average concentrations recorded in the influent were 4225.9, 7115.2, 14.1, 1664.1, 1591.1, 0.41, and 31.8 mg L−1. The best performance in the removal of organic matter and nutrients was recorded for a 2‐h HRT, with average removal efficiency of 52.9% for BOD and 26.8% for COD, and 52.5, 5.6, and 56.2% for TP, TAN, and nitrates, respectively. The low volumes required for ATPAFBRWIC suggest their potential use as compact leachate treatment units.

show abstract

“…The improvement in airlift loop reactors based on numerical algorithms is currently a research hotspot. Li et al [16] reviewed the hydrodynamics and mass transfer of concentric-tube internal loop airlift reactors. The internal components of the airlift loop reactor can improve the transfer performance.…”

Section: Introductionmentioning

confidence: 99%

The Study of Fluid Dynamics Simulation of the Internal Flow Field in a Novel Airlift Oscillation Loop Bioreactor

Liu,

Sun,

Liu

2023

Processes

View full text Add to dashboard Cite

The three-dimensional flow and mass transfer conditions in 5 L and 40 L airlift oscillation loop reactors were studied and compared with existing two-dimensional simulation and experimental data to verify the accuracy of the method. Then, the fluid dynamics behavior of the 2500 L reactor was simulated via supercomputing and provided guidance for production data. The results indicate that the application of oscillation operation in the 40 L multi-guide tube reactor can effectively improve the gas holdup and mass transfer coefficient in the reactor, with a maximum increase of 38% and 29%. For the 2500 L multi guide tube reactor, oscillation operation oscillation operation can significantly improve gas holdup and mass transfer coefficient increase gas holdup by 46% under 0.5 vvm operating conditions; the mass transfer coefficient increased by 54%. Therefore, oscillation operation can greatly improve the mass transfer coefficient for actual production reactors. After digging a hole in the middle sleeve, the circulating liquid speed has no effect. Although the gas holdup and mass transfer coefficient decreased by 1.3%, the gas holdup inside the entire reactor was more uniform, effectively reducing the average bubble aggregation.

show abstract

Hydrodynamics and mass transfer of concentric-tube internal loop airlift reactors: A review

Cited by 17 publications

References 142 publications

Gas holdup, bubble size distribution, and mass transfer in an airlift reactor with ceramic membrane and perforated plate distributor

Gas holdup, bubble size distribution, and mass transfer in an airlift reactor with ceramic membrane and perforated plate distributor

Organic matter and nutrients removal from landfill leachate by airlift aerobic three‐phase fluidized bed reactor

The Study of Fluid Dynamics Simulation of the Internal Flow Field in a Novel Airlift Oscillation Loop Bioreactor

Contact Info

Product

Resources

About