Enhanced cross-flow filtration with flat-sheet ceramic membranes by titanium-based coagulation for membrane fouling control

Highlights

• Ceramic membrane filtration showed high performance for surface water treatment.

• PTC pre-coagulation could enhance ceramic membrane filtration performance.

• Ceramic membrane fouling was investigated by four varied mathematical models.

• PTC pre-coagulation was high-effective for ceramic membrane fouling control.

Abstract

Application of ceramic membrane (CM) with outstanding characteristics, such as high flux and chemical-resistance, is inevitably restricted by membrane fouling. Coagulation was an economical and effective technology for membrane fouling control. This study investigated the filtration performance of ceramic membrane enhanced by the emerging titanium-based coagulant (polytitanium chloride, PTC). Particular attention was paid to the simulation of ceramic membrane fouling using four widely used mathematical models. Results show that filtration of the PTC-coagulated effluent using flat-sheet ceramic membrane achieved the removal of organic matter up to 78.0%. Permeate flux of ceramic membrane filtration reached 600 L/(m²·h), which was 10-fold higher than that observed with conventional polyaluminum chloride (PAC) case. For PTC, fouling of the ceramic membrane was attributed to the formation of cake layer, whereas for PAC, standard filtration/intermediate filtration (blocking of membrane pores) was also a key fouling mechanism. To sum up, cross-flow filtration with flat-sheet ceramic membranes could be significantly enhanced by titanium-based coagulation to produce both high-quality filtrate and high-permeation flux.

Graphical abstract

Keywords

Ceramic membrane / Coagulation / Polytitanium chloride / Membrane fouling

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 51978311), Taishan Scholars Young Experts Program (China) (No. tsqn202103080), and Shandong Provincial Natural Science Foundation, China (No. ZR2019BEE044).

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11783-022-1531-x and is accessible for authorized users.

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