Application of a smart dosing pump algorithm in identifying real-time optimum dose of antiscalant in reverse osmosis systems

Muhammad Nasir Mangal*, Victor A. Yangali-Quintanilla, Sergio G. Salinas-Rodriguez, Jos Dusseldorp, Bastiaan Blankert, Antoine J.B. Kemperman, Jan C. Schippers, Maria D. Kennedy, Walter G.J. van der Meer

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The potential of membrane scaling control by a real-time optimization algorithm was investigated. The effect of antiscalant dosing was evaluated from the induction time measured in glass batch-reactors, and from the operational performance of a lab-scale reverse osmosis (RO) unit and two pilot-scale RO units. Step changes in the antiscalant dosing demonstrated that the accumulation of scaling is ‘paused’ during periods when the optimum dose is applied. This is paramount for the application of a dynamic dosing strategy that may briefly underdose, while searching for the optimum dose. It was found that antiscalant underdose and overdose were both detrimental to RO operation since underdose resulted in membrane scaling, while overdose led to membrane fouling due to calcium-antiscalant deposits. The dosing algorithm was used to minimize antiscalant consumption in two pilot RO units. The algorithm was able to lower the antiscalant doses to 0.2 mg/L and 0.6 mg/L, while the supplier's recommended antiscalant doses were 2.0 mg/L and 4.5 mg/L, respectively. As a result, the algorithm could reduce antiscalant consumption by up to 85–90% for the plants mentioned.

Original languageEnglish
Article number120717
JournalJournal of membrane science
Volume658
Early online date11 Jun 2022
DOIs
Publication statusPublished - 15 Sep 2022

Keywords

  • UT-Hybrid-D
  • Calcium carbonate scaling
  • Antiscalant dose optimization
  • Brackish water RO
  • Dosing pump
  • Algorithm

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