TY - JOUR
T1 - Chlorine-induced permeability recovery for low-pressure membrane filtration of natural waters
AU - Huang, Haiou
AU - Young, Thayer A.
AU - Jacangelo, Joseph G.
N1 - Funding Information:
The authors are grateful for Mr. James Lozier and Dr. Chandra Mysore for directing the pilot-scale study. We would also like to thank Dr. Jean-Philippe Croué for conducting contact angle and streaming potential analyses and Dr. NoHwa Lee and Dr. Gary Amy for SEC–DOC analyses. Assistance from the membrane manufacturer and the Tampa Bay Regional Water Treatment Plant are cordially appreciated. This study was partially supported by American Water Works Association Research Foundation and United States Environmental Protection Agency.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/11/15
Y1 - 2008/11/15
N2 - Chlorine treatment is widely used by membrane filtration plants to recover the loss of membrane permeability encountered in low-pressure membrane (LPM) filtration of natural waters. However, there are few methodical studies in the literature addressing the efficacy of chlorine in cleaning membranes. Thus, the purpose of this study was to assess chlorine-induced permeability recovery (CIPR) of LPMs using the Ct concept (product of chlorine dose concentration and treatment time) commonly employed in the disinfection literature. The experimental work was conducted by evaluating the efficacy of CIPR for a membrane and water combination under variable Ct exposures and determining the presence of minimum effective Ct exposure and proper empirical models for the CIPR. The results showed that the efficacy of CIPR depended on both C and t. A minimum Ct exposure of approximately 2 × 105 (min mg)/L was required for effective CIPR, and the relationship between the residual fouling and chlorine exposures was best fitted using a revised Chick-Watson model. These results may be explained by a conceptual model that considers CIPR as a sequential process of oxidation of organic foulants and diffusional detachment of the reaction products from membrane surfaces. Additional work is needed to validate the applicability of the model to other waters and membranes.
AB - Chlorine treatment is widely used by membrane filtration plants to recover the loss of membrane permeability encountered in low-pressure membrane (LPM) filtration of natural waters. However, there are few methodical studies in the literature addressing the efficacy of chlorine in cleaning membranes. Thus, the purpose of this study was to assess chlorine-induced permeability recovery (CIPR) of LPMs using the Ct concept (product of chlorine dose concentration and treatment time) commonly employed in the disinfection literature. The experimental work was conducted by evaluating the efficacy of CIPR for a membrane and water combination under variable Ct exposures and determining the presence of minimum effective Ct exposure and proper empirical models for the CIPR. The results showed that the efficacy of CIPR depended on both C and t. A minimum Ct exposure of approximately 2 × 105 (min mg)/L was required for effective CIPR, and the relationship between the residual fouling and chlorine exposures was best fitted using a revised Chick-Watson model. These results may be explained by a conceptual model that considers CIPR as a sequential process of oxidation of organic foulants and diffusional detachment of the reaction products from membrane surfaces. Additional work is needed to validate the applicability of the model to other waters and membranes.
KW - Chlorine-induced permeability recovery (CIPR)
KW - Ct effect
KW - Fouling
KW - Low-pressure membrane filtration
KW - Membrane cleaning
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U2 - 10.1016/j.memsci.2008.07.024
DO - 10.1016/j.memsci.2008.07.024
M3 - Article
AN - SCOPUS:53249128853
VL - 325
SP - 50
EP - 57
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
SN - 0376-7388
IS - 1
ER -