Adiyan Waterworks Phase II
The project, located in Adiyan near Lagos, involves the construction of an intake station situated on the right bank of the Ogun River, complete with a vertical pumping system which conveys the untreated water in a spheroidal cast iron pipe 1,600 mm in diameter and approximately 8 km long.
The pipe carries the water to the purification plant comprising two parallel treatment lines and the sludge line. The purification treatment includes the flocculation, flotation, aeration, filtration with sand and activated carbon and disinfection with UV rays.
When the water has been purified and rendered fit for drinking it is sent by a pumping station in two 80 m diameter circular tanks, 12 m tall, and introduced into the aqueduct.
The Adiyan water treatment plant, an entirely gravity plant with reduced power consumption, is the only one of its kind in Africa.
MAIN TECHNICAL DATA:
Purification Capacity: 320,000 m3/g + 5% of pressure leaks
Excavations: 350,000 m3
Trench Excavations: 250,000 m3
Backfill: 245,000 m3
Concrete: 100,000 m3
Sand for Filters: 5,376 tonnes
Carbon for Filters: 1630 tonnes