Title

Combined influence of membrane surface properties and feed water qualities on RO/NF mass transfer, a pilot study

Authors

Authors

Y. Zhao; J. Taylor;S. K. Hong

Comments

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Abbreviated Journal Title

Water Res.

Keywords

integrated membrane systems; membrane surface properties; natural; organic matter; water mass transfer; solute mass transfer; REVERSE-OSMOSIS MEMBRANES; NANOFILTRATION MEMBRANES; Engineering, Environmental; Environmental Sciences; Water Resources

Abstract

The impact of membrane surface characteristics and NOM on membrane performance has been investigated for varying pretreatment and membranes in a field study. Surface charge, hydrophobicity and roughness varied significantly among the four membranes used in the study. The membranes were tested in parallel following two different pretreatment processes, an enhanced Zenon ultrafiltration process (ZN) and a compact CSF process (Superpulsator (SP)) prior to RO membrane treatment for a total of eight integrated membrane systems. All membrane systems were exposed to the similar temperature, recovery and flux as well as chemical dosage. The membrane feed water qualities were statistically equivalent following ZN pretreatment and SP pretreatment except for NOM and SUVA. Membrane surface characteristics, NOM and SUVA measurements were used to describe mass transfer in a low-pressure RO integrated membrane system. Solute and water mass transfer coefficients (MTCs) were investigated for dependence on membrane surface properties and NOM mass loading. Inorganic MTCs were accurately described by a Gaussian distribution curve. Water productivity decreased with NOM loading and increased with contact angle and roughness. The negative effects of NOM loading on productivity were reduced as the negative charge on the membrane surface increased. Inorganic MTCs were also correlated to surface hydrophobicity and surface roughness. The permeability change of identical membranes was related to NOM loading, hydrophobicity and roughness. Organic fouling as measured by water, organic and inorganic mass transfer was less for membranes with higher hydrophilicity and roughness. (c) 2005 Elsevier Ltd. All rights reserved.

Journal Title

Water Research

Volume

39

Issue/Number

7

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

1233

Last Page

1244

WOS Identifier

WOS:000229351400004

ISSN

0043-1354

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