NATIONAL FLAG SQUARE /AZERBAIJAN
Sector: State owned social facility
Location: Baku/Azerbaijan
Raw water source: Seawater
Capacity: 2400m3/day
National tflag Square hosts one of the tallest flag towers in the world, as well as multi- purpose Baku Crystal Hall where 2012 Eurovision Song Contest took place and is situated on the Caspian Sea shore, water for this huge facility is obtained by treating seawater.
Water taken from 4 onshore wells at 200 m3/day flow rate, is stored at the reinforced concrete tank whose volume is 500 m3 and disinfected and oxidized by chlorination. Water from the storage is fed into the sand and active carbon filters of 285 cm diameter using two 316 stainless steel pumps; in order to remove all particles larger than 20 micron filtration rate is intentionally kept slower resulting in high performance.
tfiltered water is further stored in 250 m3 storage volume of reinforced concrete to be used in backwashing of filters and fed into reverse osmosis system. Seawater reverse osmosis system designed as two parallel lines, each can produce 50 m3/hour product water with 50% efficiency and fed by 316 stainless steel pumps with 100 m3/hour capacity.
The reverse osmosis system consists of 72 seawater resistant membrane; high pressure pumps and pipes are made from special duplex stainless steel. The system is provided with pressure exchanger and booster pumps which enable recovery of energy consumed for obtaining high pressure. Analyzers and sensors are making online measurements at certain points of the system to control water quality at each step of the treatment process. The system has automatic cleaning and rinsing unit which prevent any possible clogging and accumulation. tfinally, water pH value is adjusted and necessary disinfection is done to make water ready for use.
Project has converted seawater with 13,000 mg/lt of total dissolved solids into water at WHO standards with TDS value of less than 150 mg/lt to meet water needs of National tflag Square.
