<Dl> <Dt> Sanitation </Dt> </Dl> <P> Approximately 550,000 cubic metres of wastewater is generated in Abu Dhabi every day and treated in 20 wastewater treatment plants . Almost all of the wastewater is being reused to irrigate green spaces . While most wastewater treatment plants are publicly owned and operated, four large new plants have been built by joint ventures under build - own operate transfer (BOOT) arrangements . One such contract for two plants was awarded in 2008, one in Abu Dhabi itself with a capacity of 300,000 cubic meter per day and one in Al Ain with a capacity of 130,000 cubic meter per day . Contracts for two other plants were awarded to Biwater under a similar structure . A Strategic Tunnel Enhancement Programme (STEP) is to be implemented between 2008 and 2014 to establish a tunnel that will comprise 40 kilometres of deep sewerage tunnel and two new large pumping stations to relieve Abu Dhabi Island . </P> <P> In Masdar City green spaces and agriculture near the city are to be irrigated with grey water and reclaimed water . </P> <P> About half of the annual water production from all sources is used for irrigation of green spaces, as well as in agriculture . The other half is used for domestic uses . Freshwater use per capita is about 650 liters per day, including water supplied for the irrigation of green spaces . </P>

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