The microbial growth potential of antiscalants used in seawater desalination

Ghadeer Hasanin, Ana Maria Mosquera, Abdul Hamid Emwas, Thomas Altmann, Ratul Das*, Paulus J. Buijs, Johannes S. Vrouwenvelder, Graciela Gonzalez-Gil

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

20 years since the first report on the biofouling potential of chemicals used for scale control, still, antiscalants with high bacterial growth potential are used in practice. Evaluating the bacterial growth potential of commercially available antiscalants is therefore essential for a rational selection of these chemicals. Previous antiscalant growth potential tests were conducted in drinking water or seawater inoculated with model bacterial species which do not represent natural bacterial communities. To reflect better on the conditions of desalination systems, we investigated the bacterial growth potential of eight different antiscalants in natural seawater and an autochthonous bacterial population as inoculum. The antiscalants differed strongly in their bacterial growth potential varying from ≤ 1 to 6 μg easily biodegradable C equivalents/mg antiscalant. The six phosphonate-based antiscalants investigated showed a broad range of growth potential, which depended on their chemical composition, whilst the biopolymer and the synthetic carboxylated polymers-based antiscalants showed limited or no significant bacterial growth. Moreover, nuclear magnetic resonance (NMR) scans enabled antiscalant fingerprinting, identifying components and contaminants, providing a rapid and sensitive characterization, and opening opportunities for rational selection of antiscalants for biofouling control.

Original languageEnglish (US)
Article number119802
JournalWater research
Volume233
DOIs
StatePublished - Apr 15 2023

Keywords

  • Biofilm growth potential
  • Flow cytometry
  • Green antiscalant
  • NMR chemical fingerprint
  • Phosphonates
  • Seawater Reverse Osmosis (SWRO) membrane module

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Ecological Modeling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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