Lethabo Power Station Desalination Plant Plant Upgrade

Client:

Client: Eskom
Capacity: 12,000m3/day
Completion date: July 2002 (upgraded in 2010)
Technology: Ultrafiltration and RO

  • The purpose of this project was to expand the desalination capacity at the water treatment plant for Eskom’s Lethabo Power Station.
  • Aveng Water replaced an older reverse osmosis plant with more modern spiral-wound polyamide, reverse osmosis membranes, helping Lethabo move closer to becoming a zero liquid discharge facility.
  • The excess saline water from the New Vaal Colliery is treated for use in the cooling towers.
  • A multi–membrane system, consisting of TORAY microfiltration and reverse osmosis membranes are used to achieve a water recovery of 80% in a single stage.
  • The existing clarifiers are used as lime softening units for the pre-treatment to the ultrafiltration, reverse osmosis plant.
  • A major requirement was to provide Eskom with the right level of redundancy and reliability ensuring the power station would operate optimally.
  • Construction and installation activities were carefully managed to ensure minimal disruption to the on-going operation of the power plant.