Sekondi-Takoradi water supply expansion projekt

The new drinking water treatment plant marks a major milestone in the region’s water supply infrastructure, replacing the former facility that had been in continuous operation since 1961. With this development, a modern, resilient, and highly efficient treatment system - designed and engineered by STRABAG - is now in place to secure reliable potable water production for decades to come. The plant incorporates state‑of‑the‑art process technology, robust mechanical and electrical systems, and a layout optimised for operational efficiency, environmental performance, and future scalability.

Scope of work:

• New raw-water intake structure at the Pra River
  A completely redesigned intake system has been constructed to ensure stable and sustainable water abstraction throughout the year. This includes a raw‑water pumping station engineered for long-term reliability. The facility is dimensioned with an option for future expansion, enabling a maximum capacity of up to 230,000 m³/day. From the intake, raw water is conveyed through a DN 1200 transmission pipeline, connecting the river intake directly to the new treatment plant site.
• Conventional water treatment plant at Daboase (capacity: 100,000 m³/day)
  The core of the project is the new treatment plant, designed to deliver consistently high water quality under varying raw‑water conditions. The process line includes:
  • aeration systems to remove dissolved gases and oxidisable substances
  • pre‑sedimentation basins for initial separation of heavier particles
  • flocculation units ensuring optimal particle agglomeration
  • high‑efficiency lamella clarifiers for compact and effective sedimentation
  • six‑chamber dual‑media filtration to achieve fine particle removal and polishing
  • chlorine‑based disinfection, complemented by multiple chemical dosing stations for coagulation, pH correction, and other necessary water conditioning steps
    All treatment stages are integrated into a streamlined process layout designed for easy operation and low maintenance.
• Clear water reservoir (5,000 m³)
  A reinforced concrete reservoir provides secure storage of treated water, ensuring stable supply during peak demand and supporting the operational flexibility of the entire system.
• High‑lift pumping station
  The high‑lift station, designed for 100,000 m³/day, conveys treated water into the transmission network. It features multiple pump units, redundancy for uninterrupted service, and modern control systems to optimise energy use and adjust output to demand patterns.
• Power supply and electrical infrastructure
  To guarantee reliable operation, the project includes a comprehensive power supply system consisting of a transformer station, medium‑ and low‑voltage distribution installations, and a fully integrated SCADA automation platform. This digital system provides real‑time monitoring, remote control capabilities, data logging, and fault diagnostics across all major components of the plant.
• Auxiliary buildings and site infrastructure
  Supporting facilities include an operations building equipped with laboratory, control room, and administration areas; accommodation for on‑site staff; and a dedicated workshop for mechanical and electrical maintenance tasks. Additionally, a new access road ensures safe and efficient transport to and from the plant.