The Effects of Sparger Design and Gas Flow Rate On, Gas Holdup Distribution and Liquid (Slurry) Recirculation Velocity Have Been Studied in a Surrogate Anaerobic Bioreactor Used for Treating Bovine Waste with a Conical Bottom Mixed by Gas Recirculation. a Single Orifice Sparger (SOS) and a Multi-Orifice Ring Sparger (MORS) with the Same Orifice Open Area and Gas Flow Rates (Hence the Same Process Power Input) Are Compared in This Study. the Advanced Non-Invasive Techniques of Computer Automated Tomography (CT) and Computer Automated Radioactive Particle Tracking (CARPT) Were Employed to Determine Gas Holdup, Liquid Recirculation Velocity, and the Poorly Mixed Zones. Gas Flows (Q 8) Ranging of 0.017 X 10-3 M3/s to 0.083 X 10-3 M3/s Were Used Which Correspond to Draft Tube Superficial Gas Velocities Ranging from 1.46 X 10-2 M/s to 7.35 X 10-2 M/s (based on Draft Tube Diameter). Air Was Used for the Gas, as the Molecular Weights of Air and Biogas (Consisting Mainly of CH4 and CO2) Are in the Same Range (Biogas: 28.32-26.08 Kg/kmol and Air: 28.58 Kg/kmol). When Compared to the SOS for a Given Gas Flow Rate, the MORS Gave Better Gas Holdup Distribution in the Draft Tube, Enhanced the Liquid (Slurry) Recirculation, and Reduced the Fraction of the Poorly Mixed Zones. the Improved Gas Holdup Distribution in the Draft Tube Was Found to Have Increased the overall Liquid Velocity. Hence, for the Same Process Power Input the MORS System Performed Better by Enhancing the Liquid Recirculation and Reducing the Poorly Mixed Zones. © 2007 Wiley Periodicals, Inc.


Chemical and Biochemical Engineering

Keywords and Phrases

Bioreactor; CARPT; CT; Power input; Sparger design

International Standard Serial Number (ISSN)

1097-0290; 0006-3592

Document Type

Article - Journal

Document Version


File Type





© 2023 Wiley, All rights reserved.

Publication Date

15 Dec 2007

PubMed ID