Novel cylindrical cross-flow hollow fiber membrane module for direct contact membrane distillation-based desalination

Document Type

Article

Publication Date

1-1-2018

Abstract

Direct contact membrane distillation-based desalination is attractive especially for high salt concentrations. We recently developed successfully a hollow-fiber membrane (HFM) based rectangular module with hot brine in cross-flow over the HFMs and obtained high and stable water flux under demanding scaling conditions. This module design with a low surface area/device volume is inadequate for larger-scale plants. A novel cylindrical cross-flow module containing high-flux composite hydrophobic HFMs is described for membrane surface areas, 0.15 and 0.6 m2, using porous fluorosiloxane-coated porous polypropylene hollow fibers. This simple and easily-scalable module design packs four times membrane surface area/unit equipment volume compared to earlier design. Distilled water production rates from 1 wt% saline feed was studied over brine temperatures of 60–91 °C. A model developed to describe the observed water production rates in dead-end feed introduction configuration appears to describe observed water production rates well. Model predictions were explored for a range of HFM lengths and larger HFM ID to compare with those from rectangular modules with shorter HFMs.

Identifier

85030862240 (Scopus)

Publication Title

Journal of Membrane Science

External Full Text Location

https://doi.org/10.1016/j.memsci.2017.09.007

e-ISSN

18733123

ISSN

03767388

First Page

312

Last Page

322

Volume

545

Fund Ref

Bureau of Reclamation

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