Gypsum scaling propensity in semi-batch RO (SBRO) and steady-state RO with partial recycle (SSRO-PR)

Membrane mineral scaling in semi-batch RO and steady-state RO with partial recycle were investigated experimentally in a spiral-wound pilot system with gypsum as a model scalant

Tae Lee; Jin Yong Choi; Yoram Cohen

2019

Scholarcy highlights

  • Membrane mineral scaling in semi-batch RO and steady-state RO with partial recycle were investigated experimentally in a spiral-wound pilot system with gypsum as a model scalant
  • Flushing much longer than the convective residence time needed for scale removal
  • Real-time tracking of mineral scaling revealed that SBRO was more prone to mineral scaling, in terms of both crystals formation rate and scaled membrane surface area, relative to SSRO-PR
  • The crystallization induction time was shorter and rate of crystal formation higher in SBRO relative to SSRO-PR. This behavior was consistent with the higher level of gypsum supersaturation reached in the SBRO filtration period when compared to SSRO-PR at either one of the above operational scenarios
  • For a given recovery, improved scale mitigation in semi-batch RO via extended flushing to reset the “crystallization induction clock” may be feasible, but the tradeoff is an extended filtration period with a higher level of solution supersaturation

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