The effect of pH on the formation of gypsum scale in the presence of phosphonate antiscalant

Y. O. Rosenberg, J. Ganor, S. Zmora-Nahum

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

We report on formation of gypsum scale from the concentrate of a desalination plant despite the presence of a phosphonate antiscalant (PermaTreat 191). Batch experiments were conducted in order to study the relevant chemical conditions that lowered the effectiveness of this antiscalant and led to the formation of the scale. It is shown that the antiscalant is effective in postponing nucleation and hindering crystal growth of gypsum in the supersaturated concentrate with a neutral pH. However, as pH decreases both nucleation and crystal growth accelerate. In this specific desalination plant, a sharp drop in concentrate pH occurs when an acidic effluent, a byproduct of a boron removal facility, is added in small amounts. The pH effect on gypsum crystal growth, even at circum-natural pH values, is gradual. This gradual trend suggests that protonation of the antiscalant functional groups lowers antiscalant adsorption to gypsum and hence represses its effectiveness.

Original languageEnglish GB
Title of host publicationWater-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13
PublisherCRC Press
Pages493-496
Number of pages4
ISBN (Electronic)9781439862995
ISBN (Print)9780415604260
StatePublished - 1 Jan 2010
Event13th International Conference on Water-Rock Interaction, WRI-13 - Guanajuato, Mexico
Duration: 16 Aug 201020 Aug 2010

Publication series

NameWater-Rock Interaction - Proceedings of the 13th International Conference on Water-Rock Interaction, WRI-13

Conference

Conference13th International Conference on Water-Rock Interaction, WRI-13
Country/TerritoryMexico
CityGuanajuato
Period16/08/1020/08/10

ASJC Scopus subject areas

  • Environmental Science (all)
  • Earth and Planetary Sciences (all)

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