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Article

Tanning Wastewater Treatment by Ultrafiltration: Process Efficiency and Fouling Behavior

by 1,2, 1,2, 1,2, 1,2, 1,2,3 and 1,2,*
1
College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China
2
Key Laboratory for Leather and Engineering of the Education Ministry, Sichuan University, Chengdu 610065, China
3
National Engineering Research Center of Solid-State Manufacturing, Luzhou 646000, China
*
Author to whom correspondence should be addressed.
Academic Editors: Anthony Szymczyk and Patrick Loulergue
Membranes 2021, 11(7), 461; https://doi.org/10.3390/membranes11070461
Received: 26 May 2021 / Revised: 17 June 2021 / Accepted: 17 June 2021 / Published: 22 June 2021
(This article belongs to the Special Issue Advanced Membrane Processes in Water Treatment)
Ultrafiltration is a promising, environment-friendly alternative to the current physicochemical-based tannery wastewater treatment. In this work, ultrafiltration was employed to treat the tanning wastewater as an upstream process of the Zero Liquid Discharge (ZLD) system in the leather industry. The filtration efficiency and fouling behaviors were analyzed to assess the impact of membrane material and operating conditions (shear rate on the membrane surface and transmembrane pressure). The models of resistance-in-series, fouling propensity, and pore blocking were used to provide a comprehensive analysis of such a process. The results show that the process efficiency is strongly dependent on the operating conditions, while the membranes of either PES or PVDF showed similar filtration performance and fouling behavior. Reversible resistance was the main obstacle for such process. Cake formation was the main pore blocking mechanism during such process, which was independent on the operating conditions and membrane materials. The increase in shear rate significantly increased the steady-state permeation flux, thus, the filtration efficiency was improved, which resulted from both the reduction in reversible resistance and the slow-down of fouling layer accumulate rate. This is the first time that the fouling behaviors of tanning wastewater ultrafiltration were comprehensively evaluated, thus providing crucial guidance for further scientific investigation and industrial application. View Full-Text
Keywords: tanning wastewater; ultrafiltration; membrane fouling; fouling propensity; pore blocking tanning wastewater; ultrafiltration; membrane fouling; fouling propensity; pore blocking
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MDPI and ACS Style

Yang, F.; Huang, Z.; Huang, J.; Wu, C.; Zhou, R.; Jin, Y. Tanning Wastewater Treatment by Ultrafiltration: Process Efficiency and Fouling Behavior. Membranes 2021, 11, 461. https://doi.org/10.3390/membranes11070461

AMA Style

Yang F, Huang Z, Huang J, Wu C, Zhou R, Jin Y. Tanning Wastewater Treatment by Ultrafiltration: Process Efficiency and Fouling Behavior. Membranes. 2021; 11(7):461. https://doi.org/10.3390/membranes11070461

Chicago/Turabian Style

Yang, Fu, Zhengkun Huang, Jun Huang, Chongde Wu, Rongqing Zhou, and Yao Jin. 2021. "Tanning Wastewater Treatment by Ultrafiltration: Process Efficiency and Fouling Behavior" Membranes 11, no. 7: 461. https://doi.org/10.3390/membranes11070461

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