Djibouti

Customer

Eiffage – Tedagua

Country

Djibouti

Year

2015

Category

Bidding

Description

DESIGN, CONSTRUCTION AND OPERATION FOR 5 YEARS OF A DESALINATION STATION, A TRANSFER LINE AND A DRINKING WATER TANK (DJIBOUTI)

Production capacity

–

Characteristics

Processing line formed by; Sea water screening system, Sea water tank, Sea water pumping station, Sea water transport pipe to the desalination plant, Reagent injections (sodium hypochlorite and coagulant), Pressure filtration system (two stages), Filter washing system, Storage of brine used for backwashing of filters, Reagent injections (sodium hydroxide, precipitation inhibitors and sodium bisulphite), high pressure pumping to feed reverse osmosis membranes, Energy recovery (isobar chambers), Reverse osmosis, Equipment for chemical cleaning and post-service rinsing of reverse osmosis membranes, Grain filter feed pumps of limestone, Remineralization of desalinated water by injection of CO2 then passage through limestone grain filters, Final disinfection with injection of sodium hypochlorite, Injection of soda for pH and LSI adjustment, Storage of treated water ted in the 2000 m³ reservoir, Pumping station for treated water to the Farah Had reservoir, Neutralization and disposal of dirty washing water from filters and reverse osmosis effluents (concentrated brine and chemical cleaning effluents).

Scope

  • A technical brief describing and justifying the different stages of the operation of the production of drinking water.
  • A technical thesis on hydraulic calculations.
  • A technical brief bringing together the different simulations of membrane operation.
  • The technical sheets of the various electromechanical equipment.
  • The ground plan of the desalination station and hydraulic structures.
  • The formwork and architectural plans of the various works and buildings of the desalination plant.
  • The flow diagram with a hydraulic balance of the desalination station.
  • The hydraulic profile along the process.
  • The P&ID (process and instrumentation plan for the entire desalination plant).
  • The electric power supply plan.