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Structural characteristics of a spiral symmetry stream anaerobic bioreactor based on CFD by Jian Zhang; Xiaoguang Chen; Jianshe Liu; Bo Huang; Ming Xu is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The structural characteristics of a spiral symmetry stream anaerobic bioreactor (SSSABR) contribute to its super-high-rate performance. This study investigated the structural characteristics of SSSABR, including distribution zone, spiral reaction zone, and three-phase separation zone, by computational fluid dynamics (CFD). In distribution zone, uniformity and hydraulic head loss increased with increasing number of orifices, and five-orifice is deemed optimal for distributor. In spiral reaction zone, a 45° cutting angle produced a tangential velocity strong enough to spin the granular sludge and maintain a moderate mixing intensity. A 30° installation angle produced a wide range of spiral flows. The 120° symmetrical arrangement of plates formed a strong–weak periodic spiral flow that strengthened material exchange. In separation zone, a value of 0.625 for the frustum characteristic parameter i (i = r 1/r 2, where r 1 presented the bottom frustum radius of reverse cone, and r 2 presented radius of spiral reaction zone of SSSABR) provided moderate recirculation. The relative error of dead zone rate between CFD and tracer experiment was 4.66%.

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Author

Jian Zhang; Xiaoguang Chen; Jianshe Liu; Bo Huang; Ming Xu

Published

2018

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Physical Sciences)