Nanofiltration for oil-fields water injection operations: analysis of concentration polarization [An article from: Desalination]

This digital document is a journal article from Desalination, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
Nanofiltration (NF) membranes are capable of highly rejecting divalent anions (e.g., sulfate) while retaining a large portion of monovalent anions (e.g., chloride) from seawater. NF is thus a potential technology to provide nearly sulfate-free seawater for oil fields water injection operations. However, as the case with any pressure-driven membrane processes, concentration polarization is the most critical problem encountered in NF operation. For proper design and operation of NF for selective removal of sulfate from seawater and the like of saline streams, knowledge of ions concentrations at the membrane surface and on the concentrate side of the membrane is critical. This second article, in a four-part series, provides a modeling tool to analyze the effect concentration polarization phenomena in NF. Such an analysis allows the prediction of the actual rejection (R"a) in the absence of concentration polarization, and the accumulation of rejected ions at the membrane surface (C"m).