Membrane Science and Technology

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Effects of clearance between membranes and bubble shape upon membrane fouling in a flat-sheet membrane bioreactor

Authors： Wang Dong, Feng Chao, Chen Yazhong*, Zhu Hao, Wang Qi and Cui Peng

Units： Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering, School of Chemical Engineering, Hefei University of Technology, Hefei, 230009

KeyWords： flat-sheet membrane bioreactor; membrane fouling; membrane clearance; bubble shape; Orifice diameter

ClassificationCode：X703.1

year,volume(issue):pagination： 2014, 34(6):100-105

Abstract：

Membrane bioreactor constructed from flat-sheet membranes was built on a lab scale to study the influences of clearance between membranes (4.0, 8.0 and 12.0 mm, respectively), air bubbling intensity and air bubbling size (tubular bubbling device with orifices of different diameter of 1.0, 2.0 and 3.0 mm) on the membrane fouling process. A simulated membrane bioreactor was constructed to study the bubble formation, shapes and rising between membrane clearances using clean water as permeate. The results indicated that when the membrane clearance was 4.0 mm, membrane fouling rate was the smallest. Observation of the bubble formation and movement through image pickup in the simulated membrane bioreactor and image analysis revealed that when the clearance of the membranes was 4.0 mm, the bubble deforms through distortion to the largest extent and emerges as cap shape, providing the largest scouring surface of the membranes. The uprising velocity of bubble is significantly reduced due to the “wall effects”. For the bubbling devices with different orifice diameter, the one with 1.0 mm orifice diameter efficiently reduced the membrane fouling rate, simultaneously providing higher concentration dissolved oxygen for the aeration MBR.

Funds：

安徽省高等学校自然科学研究项目(KJ2012A240)

AuthorIntro：

王栋(1988—), 男, 安徽省安庆市人, 硕士, 主要从事膜生物反应器过程的膜污染及其控制研究.

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