Effects of a novel bimetallic catalytic biofilter-based pretreatment technique on the form of ultrafiltration membrane fouling

doi:10.1016/j.cjche.2020.03.015

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (10): 2513-2522.DOI: 10.1016/j.cjche.2020.03.015

• Separation Science and Engineering • Previous Articles Next Articles

Effects of a novel bimetallic catalytic biofilter-based pretreatment technique on the form of ultrafiltration membrane fouling

Songze Hao^1,2, Xuehui Zhao^1,3, Hongwei Zhang^1,3, Yun Wu^1,3, Cheng Fang¹, Xujia Wang¹

1 State Key Laboratory of Separation Membrane and Membrane Process, Tiangong University, Tianjin 300387, China;
2 School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China;
3 School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China

Received:2019-12-16 Revised:2020-03-03 Online:2020-12-03 Published:2020-10-28
Contact: Xuehui Zhao
Supported by:
This study is financially supported by the National Natural Science Foundation of China (No. 51638011, No. 51678410, No. 51878448, No. 51578374), National Program on Key Research Project [No. YS2017YFGH000386], Tianjin Science and Technology Plan Project [No. 16PTGCCX00070]. We also thank for the support of Tianjin Education Council, the Key of Science and Technology Plan Project (No. 2019ZD06).

Effects of a novel bimetallic catalytic biofilter-based pretreatment technique on the form of ultrafiltration membrane fouling

Songze Hao^1,2, Xuehui Zhao^1,3, Hongwei Zhang^1,3, Yun Wu^1,3, Cheng Fang¹, Xujia Wang¹

1 State Key Laboratory of Separation Membrane and Membrane Process, Tiangong University, Tianjin 300387, China;
2 School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China;
3 School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China

通讯作者: Xuehui Zhao
基金资助:
This study is financially supported by the National Natural Science Foundation of China (No. 51638011, No. 51678410, No. 51878448, No. 51578374), National Program on Key Research Project [No. YS2017YFGH000386], Tianjin Science and Technology Plan Project [No. 16PTGCCX00070]. We also thank for the support of Tianjin Education Council, the Key of Science and Technology Plan Project (No. 2019ZD06).

Abstract

Abstract: Pretreatments of influents using bimetallic catalytic biofilter (BC-biofilter) can help reduce transmembrane pressures. For ultrafiltration membranes coupled with a conventional biofilter pretreatment, the cake layer resistance accounts for 25.0% of the total resistance. However, for those coupled with BC-biofilter pretreatment, the cake layer resistance accounts only for 12.5% of the total resistance. Confocal laser scanning microscopy is employed to determine the porosity of cake layer. It is found that ultrafiltration membranes with BC-biofilter pretreatment show a cake layer porosity of up to 0.56 or greater, whereas those with a conventional biofilter pretreatment exhibit a cake layer porosity of only 0.36. This is because micro-flocculation occurs in the effluents of BC-biofilter. The flocs generated through flocculation deposit on membrane surfaces to create highly porous cake layer. Moreover, catalytic reduction can increase the zeta potentials of the biofilter effluents. This makes the deposition of colloidal particles and flocs on membrane surfaces difficult under electrostatic repulsion. Simultaneously, micro-flocculation after BC-biofilter pretreatment can remove colloidal particles with particle sizes of 200-350 nm in water. This can effectively prevent the blockage of ultrafiltration membrane pores. Furthermore, compared to conventional biofilter, BC-biofilter pretreatment can more effectively reduce the number of colloidal particles and the van der Waals forces of ultrafiltration membranes. They can also change the action directions of electric double layers and thereby mitigate ultrafiltration membrane fouling.

Key words: Catalytic reduction, Micro-flocculation, Cake layer, Membrane pore, Membrane fouling

摘要： Pretreatments of influents using bimetallic catalytic biofilter (BC-biofilter) can help reduce transmembrane pressures. For ultrafiltration membranes coupled with a conventional biofilter pretreatment, the cake layer resistance accounts for 25.0% of the total resistance. However, for those coupled with BC-biofilter pretreatment, the cake layer resistance accounts only for 12.5% of the total resistance. Confocal laser scanning microscopy is employed to determine the porosity of cake layer. It is found that ultrafiltration membranes with BC-biofilter pretreatment show a cake layer porosity of up to 0.56 or greater, whereas those with a conventional biofilter pretreatment exhibit a cake layer porosity of only 0.36. This is because micro-flocculation occurs in the effluents of BC-biofilter. The flocs generated through flocculation deposit on membrane surfaces to create highly porous cake layer. Moreover, catalytic reduction can increase the zeta potentials of the biofilter effluents. This makes the deposition of colloidal particles and flocs on membrane surfaces difficult under electrostatic repulsion. Simultaneously, micro-flocculation after BC-biofilter pretreatment can remove colloidal particles with particle sizes of 200-350 nm in water. This can effectively prevent the blockage of ultrafiltration membrane pores. Furthermore, compared to conventional biofilter, BC-biofilter pretreatment can more effectively reduce the number of colloidal particles and the van der Waals forces of ultrafiltration membranes. They can also change the action directions of electric double layers and thereby mitigate ultrafiltration membrane fouling.

关键词: Catalytic reduction, Micro-flocculation, Cake layer, Membrane pore, Membrane fouling

Songze Hao, Xuehui Zhao, Hongwei Zhang, Yun Wu, Cheng Fang, Xujia Wang. Effects of a novel bimetallic catalytic biofilter-based pretreatment technique on the form of ultrafiltration membrane fouling[J]. Chinese Journal of Chemical Engineering, 2020, 28(10): 2513-2522.

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Effects of a novel bimetallic catalytic biofilter-based pretreatment technique on the form of ultrafiltration membrane fouling

Effects of a novel bimetallic catalytic biofilter-based pretreatment technique on the form of ultrafiltration membrane fouling

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