Breaking the Symmetry: Mitigating Scaling in Tertiary Treatment of Waste Effluents Using a Positively Charged Nanofiltration Membrane

Stanislav Levchenko, Viatcheslav Freger

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

When salinity of municipal wastewater increases and approaches the limits of toxicity for plants, moderate desalting of wastewater becomes vital for keeping it suitable for irrigation. Nanofiltration (NF) is an attractive solution, as it partially removes NaCl. Unfortunately, commercial NF membranes (e.g., NF270) strongly reject multivalent ions present in wastewater, especially, scale-forming calcium and phosphate. This results in undesired demineralization, severe membrane scaling, and unacceptably low water recovery. To address this problem, we report here that a positively charged NF (p-NF) performs significantly better than NF270, owing to overall lower rejection of scale-forming ions. Therefore, for a commensurate flux and NaCl rejection, p-NF shows much less scaling than NF270, even at recoveries as large as 80%-85%. This suggests that p-NF may have an advantage over standard NF for moderate desalting of wastewater and other water sources with high scaling potential.

Original languageEnglish
Pages (from-to)339-343
Number of pages5
JournalEnvironmental Science and Technology Letters
Volume3
Issue number9
DOIs
StatePublished - 13 Sep 2016
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Ecology
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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