REMOVAL OF SLUDGE ATTACHED TO THE WALL OF A PLANAR VESSEL DUE TO BUBBLE MOTION

被引：2

作者：

Kurimoto R. ^{[1
]}

Hayashi K. ^{[1
]}

Tomiyama A. ^{[1
]}

机构：

[1] Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe

来源：

Multiphase Science and Technology | 2021年 / 33卷 / 03期

基金：

日本学术振兴会;

关键词：

bubble; liquid circulation; membrane bioreactor; planar vessel; sludge removal;

D O I：

10.1615/MultScienTechn.2021039128

中图分类号：

学科分类号：

摘要：

The removal process of sludge attached to the wall of a planar vessel due to bubble motion was observed to understand the role played by bubbly flows in the removal of particulate contaminants on membranes in membrane bioreactors. The width, depth, and height of the planar vessel were 50, 3, and 380 mm, respectively. Pseudo sludge was attached to the left narrow wall of the vessel. Bubbles were released from the left bottom of the vessel in stagnant water. The bubble flow was classified into three regions in the vertical direction: bubble sliding region; liquid circulation region; and bubble approaching region. The difference in flow characteristics of the three regions affected the sludge removal rate and the bubble sliding region was the most effective. The shear stress acting on sludge in each region was estimated based on the observed flow characteristics, bubble diameter, and bubble velocity, and its magnitude was consistent with the removal rate. Bubble motion in the sliding bubble region was further discussed based on quantitative data obtained using an image processing method, which confirmed that the decrease in the increase rate of the ratio of the residence time of bubbles near the sludge to the recording time caused the plateau of the removal rate in a high gas flow rate. © 2021 Begell House Inc.. All rights reserved.

引用

页码：53 / 66

页数：13

共 10 条

[1]

Bohm L., Drews A., Prieske H., Berube P.R., Kraume M., The Importance of Fluid Dynamics for MBR Fouling Mitigation, Bioresour. Technol, 122, pp. 50-61, (2012)

[2]

Bohm L., Kraume M., Fluid Dynamics of Bubble Swarms Rising in Newtonian and Non-Newtonian Liquids in Flat Sheet Membrane Systems, J. Membr. Sci, 475, pp. 533-544, (2015)

[3]

Chan C.C.V., Berube P.R., Hall E.R., Shear Profiles inside Gas Sparged Submerged Hollow Fiber Membrane Modules, J. Membr. Sci, 297, pp. 104-120, (2007)

[4]

Fulton B.G., Redwood J., Tourais M., Berube P.R., Distribution of Surface Shear Forces and Bubble Characteristics in Full-Scale Gas Sparged Submerged Hollow Fiber Membrane Modules, Desalination, 281, pp. 128-141, (2011)

[5]

Hashida M., Hayashi K., Tomiyama A., Rise Velocities of Single Bubbles in a Narrow Channel between Parallel Flat Plates, Int. J. Multiphase Flow, 111, pp. 285-293, (2019)

[6]

Hashida M., Hayashi K., Tomiyama A., Effects of Fine Particles on Terminal Velocities of Single Bubbles in a Narrow Channel between Parallel Flat Plates, Int. J. Multiphase Flow, 127, (2020)

[7]

Javid S.M., Passandideh-Fard M., Faezian A., Goharimanesh M., Slug and Bubble Flows in a Flat Sheet Ultrafiltration Model: Experiments and Numerical Simulation, Int. J. Multiphase Flow, 91, pp. 39-50, (2017)

[8]

Maekawa M., Hosokawa S., Tomiyama A., Diameters of Bubbles Released from Single Holes, Trans. JSME, Ser. B, 73, 735, pp. 2220-2226, (2007)

[9]

Marubayashi O., Nagaoka H., Toyooka K., Sibuya S., Effects of Setting of Baffle Plates to Submerged Membrane Modules on the Production of Larger Bubbles and Change of Fluid Flow Field, J. Jpn. Soc. Civil Eng., Ser. G (Environ. Res.), 71, 7, pp. III467-III478, (2015)

[10]

Ueda T., Hata K., Kikuoka Y., Seino O., Effects of Aeration on Suction Pressure in a Submerged Membrane Bioreactor, Water Res, 31, 3, pp. 489-494, (1997)

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