Comparison of the Performance of Internal and External Loop Air-lift Reactors for Water Treatment by Activated Sludge

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Salehi Mohammad Ali; Hakimghiasi Nasrin

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Journal: JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY Year:2019 | Volume:21 | Issue:9 (88) Page(s): 82-93

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Information Journal Paper

Title

Comparison of the Performance of Internal and External Loop Air-lift Reactors for Water Treatment by Activated Sludge

Author(s)

Salehi Mohammad Ali | Hakimghiasi Nasrin | Issue Writer Certificate

Keywords

Airlift reactorQ1

Gas holdupQ1

Mass transferQ2

superficial gas velocityQ1

Abstract

Background and Objective: In This study the impacts of operating conditions such as aeration rate, the downcomer-to-riser cross-sectional area ratio (Ad/Ar), and liquid phase properties on the hydrodynamics and volumetric Mass transfer coefficient in three-phase Airlift reactors was investigated. Method: Experiments were conducted in external loop air-lift reactor with downcomer to riser cross-sectional area ratio (AD/AR=0. 14) and internal air-lift reactors with downcomer to riser cross-sectional area ratios 0. 36 and 1. Air and Water were used as gas and liquid phases, respectively and activated sludge is used as the solid phase. Findings: The liquid circulation velocity, Gas holdup and Mass transfer coefficient increased with an increase in the superficial gas velocity, decrease the sludge concentration and decrease downcomer to riser cross-sectional area ratio. The maximum amount of gas hold up, 0. 178 in external air-lift reactor with 1%(w/w) activated sludge in superficial gas velocity 0. 24(m/s) was observed. A model to predict the effect of activated sludge concentration, the superficial gas velocity and the downcomer-to-riser cross-sectional area ratio on the Mass transfer activated sludge Airlift reactors provided which with the experimental results are in good agreement. Discussion and Conclusion: The evaluation of internal and external reactors performance at different concentration and superficial gas velocity show that the air-lift reactor with external loop has better performance in comparison with internal Airlift reactors.

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APA: Copy

Salehi, Mohammad Ali, & Hakimghiasi, Nasrin. (2019). Comparison of the Performance of Internal and External Loop Air-lift Reactors for Water Treatment by Activated Sludge. JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, 21(9 (88) ), 82-93. SID. https://sid.ir/paper/395900/en

Vancouver: Copy

Salehi Mohammad Ali, Hakimghiasi Nasrin. Comparison of the Performance of Internal and External Loop Air-lift Reactors for Water Treatment by Activated Sludge. JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY[Internet]. 2019;21(9 (88) ):82-93. Available from: https://sid.ir/paper/395900/en

IEEE: Copy

Mohammad Ali Salehi, and Nasrin Hakimghiasi, “Comparison of the Performance of Internal and External Loop Air-lift Reactors for Water Treatment by Activated Sludge,” JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY, vol. 21, no. 9 (88) , pp. 82–93, 2019, [Online]. Available: https://sid.ir/paper/395900/en

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