膜科学与技术

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Study on the effect of pore size of ceramic membrane on the separation performance of biological fermentation broth

Authors： Ziyi Men, Yahan Ye, Haowei Yu, Juanjuan Wen, Xianfu Chen, Minghui Qiu, Yiqun Fan

Units： State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing Tech University, Nanjing 210009, China

KeyWords： anti-biofouling; pore size; ceramic membrane; critical operating flu

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(6):95-102

Abstract：

Biological fouling generally exists in the application of membrane separation technology to fermentation broth treatment due to the characteristics of complex composition, high viscosity, and instability of the biological fermentation broth, which reduces the filtration performance of membranes and greatly limits the application of membrane technology in the biological fermentation industry. This article focuses on the relationship between the membrane pore size and the composition of the target material and liquid, and investigates the critical operating flux of ceramic membranes with different pore sizes of 5-100 nm in different solution systems, and evaluates the effect of the membrane pore size control mechanism on the improvement of the anti-biofouling performance during the application of ceramic membranes. The bovine serum albumin solution was selected as the reference system, and D-fructose and Escherichia coli culture medium were added to prepare different solution systems. Through filtration experiments, the stable permeation flux of ceramic membrane tubes under different pressures was determined. The results show that in the bovine serum albumin simulation system, the critical operating pressure of the 10 nm ceramic membrane tube is about 0.3 MPa, and the critical operating flux is about 210.26 L·m-2·h-1. The critical operating pressure increases as the pore size decreases. With the complexity of the solution system increases, the critical operating pressure of the ceramic membrane tube gradually decreases, while the ultrafiltration membrane with a small pore size of 10nm shows better anti-pollution performance in the complex solution system.

Funds：

国家重点研发项目(2021YFC2101200)，国家自然科学基金(22078147，21921006)，国家合成生物技术创新中心科研项目(TSBICIP-KJGG-002-16)，江苏高等教育重点学科建设项目(PAPD)，国家级大学生创新创业训练计划项目（2020DC0387）

AuthorIntro：

孟子怡(1996)，女，江苏徐州人，硕士，研究方向为膜分离，E-mail：mengziyi96@163.com

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