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Article

Direct Membrane Filtration for Wastewater Treatment Using an Intermittent Rotating Hollow Fiber Module

Departamento de Ingeniería Química y Tecnología Farmacéutica, Universidad de La Laguna (ULL), Facultad de Ciencias—Sección de Química, Avenida Astrofísico Francisco Sánchez, s/n. Campus de Anchieta, Apdo. de Correos 456, CP 38200 La Laguna, Tenerife, Spain
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Water 2020, 12(6), 1836; https://doi.org/10.3390/w12061836
Received: 8 June 2020 / Revised: 23 June 2020 / Accepted: 24 June 2020 / Published: 26 June 2020
(This article belongs to the Special Issue Membrane Technologies and Water Treatment)
Direct membrane filtration of municipal wastewater has attracted a considerable interest in recent years. Preventing severe membrane fouling is a crucial issue in the process development. This paper aims to assess the effectiveness of a rotating hollow fiber module in enhancing fouling control. The effect of rotation speed, intermittence and permeate flux was studied in short-term tests at lab-scale. A combined filtration model considering residual fouling, intermediate pore blocking and cake filtration was used to analyze the effect of the shear induced by rotation. Results showed a significant flux improvement by increasing rotation shear stress and showed a nearly linear correlation between the threshold flux (ranged between 12 and 32 L·h−1·m−2) and the rotation speed. A proper rotation intermittence (10/15 on/off) was found, which may maintain a fouling control comparable to that achieved for continuous rotation. For a given energy demand, the optimal operating conditions involve high speeds (≥180 rev·min−1) with low to moderate intermittences. Analyzing the relative contribution of the different feedwater fractions on membrane fouling, colloidal particles and macromolecules were found to be the main contributors. View Full-Text
Keywords: ultrafiltration; mechanical shear; threshold flux; fouling; shear-enhanced filtration ultrafiltration; mechanical shear; threshold flux; fouling; shear-enhanced filtration
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MDPI and ACS Style

Ruigómez, I.; González, E.; Rodríguez-Gómez, L.; Vera, L. Direct Membrane Filtration for Wastewater Treatment Using an Intermittent Rotating Hollow Fiber Module. Water 2020, 12, 1836. https://doi.org/10.3390/w12061836

AMA Style

Ruigómez I, González E, Rodríguez-Gómez L, Vera L. Direct Membrane Filtration for Wastewater Treatment Using an Intermittent Rotating Hollow Fiber Module. Water. 2020; 12(6):1836. https://doi.org/10.3390/w12061836

Chicago/Turabian Style

Ruigómez, Ignacio, Enrique González, Luis Rodríguez-Gómez, and Luisa Vera. 2020. "Direct Membrane Filtration for Wastewater Treatment Using an Intermittent Rotating Hollow Fiber Module" Water 12, no. 6: 1836. https://doi.org/10.3390/w12061836

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