New insights into silica scaling on RO-membranes

Andreas Kempter, Torben Gaedt, Volodymyr Boyko, Stephan Nied, Keith Hirsch

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The polymerization of silica in hard water was investigated by using different supersaturation levels of silica at pH 7 and 8. The results indicate a kinetically stable range up to ~400ppm [SiO2] under the chosen conditions at pH 7, whereas no such range is present at pH 8. Additionally, polyvinylpyrrolidone and polyethers were tested for their silica inhibition capabilities. It was found that the performance is depending on molecular weight as well as dosage of the polymers, respectively. From these results, a mechanism for inhibition at pH 7 and 8 was suggested.

Original languageEnglish
Pages (from-to)899-907
Number of pages9
JournalDesalination and Water Treatment
Volume51
Issue number4-6
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • Antiscalants
  • Polymers
  • RO membranes
  • Scaling process
  • Silica polymerization
  • Silica scale

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