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Tehran wastewater project is considered one of the largest environmental conservation plans in the region. Once this project is completed, it will consist of 9000 Km of main and auxiliary network, 192 Km of tunnels, 900000 wastewater branching and 22 wastewater treatment centres (with 900 million cm3 treatment capacity per year (

At the end of this project, all population in city of Tehran (Roughly 11 million) , will receive complete wastewater services which includes  collecting, transferring, treating and sanitary discharges.

Complete Implementation of this project, will vastly reduce contamination of water resources, increases the health of Tehran citizens and also increases the land available for agricultural activities in the south of Tehran

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