Design and test of a reverse osmosis pressure cell for in-situ small-angle neutron scattering studies

Dietmar Schwahn, Herbert Feilbach, Thomas Starc, Vitaliy Pipich, Roni Kasher, Yoram Oren

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We introduce a new method for real-time studies of membrane scaling and biofouling on thin film composite membranes (TFC) in reverse osmosis and nanofiltration water treatment using in-situ small-angle neutron scattering (SANS). SANS delivers information on nano and microscopic structures that support the interpretation of relevant engineering parameters such as membrane permeability and water flux. A flow cell high pressure SANS is described, followed by SANS characterization of TFC membranes finding ~ 0.5 μm large cavities and ~ 300 Å diameter large rod-like cavities inside the non-woven polyester and micro-porous polysulfone layer, respectively. In-situ desalination experiments in cross-flow mode at an applied pressure of 6 bars and feed flow velocity of 0.2 cm/s are followed. The scattering cross-section times sample thickness (μt = Σt × DS) derived from the transmission coefficient shows an overall enhancement due to newly formed scattering centers which is accompanied by a reduced membrane permeability measured simultaneously. This observation is supported by enhanced scattering of the membrane due to μm large domains of mass fractal structure. The addition of the protein BSA to the feed after desalination of 30 h effectuates strong enhancement of the permeability accompanied by a about a 50% decline of μm large scattering centers.

Original languageEnglish
Pages (from-to)40-50
Number of pages11
JournalDesalination
Volume405
DOIs
StatePublished - 1 Mar 2017

Keywords

  • Effect of bovine serum albumin (BSA) on scaling
  • In-situ RO studies using Small-Angle Neutron Scattering (SANS)
  • Reverse osmosis (RO) wastewater desalination
  • SANS characterization of RO membrane

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science
  • Water Science and Technology
  • Mechanical Engineering

Fingerprint

Dive into the research topics of 'Design and test of a reverse osmosis pressure cell for in-situ small-angle neutron scattering studies'. Together they form a unique fingerprint.

Cite this