of Tehran waste water plan was discussed when water pipeline operation started
in 1948. The studies of this plan were begun with United Nations Development
Program (UNDP) and World Health Organization (WHO) in 1971 and these studies
were approved in 1995 and in October of the same year, the implementation was
started; this plan was revised in an International Tender because of the
project importance and related crisis, and was finally approved in 2011.
Executive operation of Tehran Wastewater Project in an area of 700000 hectare,
back in 1995 started in all 22 Tehran municipality districts, and it intended
to cover all 11 millions inhabitants by 2032.
Project based on priorities, has been divided in 5 separated implementation
phases. In this project, construction of 9000 Km of wastewater collecting
networks, 76Km of wastewater transmission tunnels, installing more than 900,000
wastewater connections, and construction of 20 modules of wastewater treatment
plant are planned.
Due to extremely
expensive costs of this project, implementation problems and also financial
limitations, receiving loans from international bodies was considered.
2005, Tehran Water and Wastewater Company was able to receive 145 M$ which was
the first phase of a loan from International Bank.
Protection of the environment
Promotion of public sanitary level
Preventing contamination of und-erground water resources considered as a part
of water supply reservoirs.
Transferring heavy costs of medi-cal treatment to the low costs of dis-ease
Expansion of green zones and clean air to improve public behaviour in a
Preventing usage of raw sewage in irrigation, (this problem is already solved)
Changing water consumption trend from a single wa-steful cycle to a multiple
and useful cycle.
Replenishing water beds around Tehran with the effluent.
Wastewater plan, as one of the greatest enviromental project, has a goal, to
save this mega-city from unpleasant conditions of unsanitary and traditional
discharge of waste water in various parts of the city. This project as of now
under the title of "city of Tehran , waste water network construction
project" is being carry out . In Tehran, waste water has been generated in
households and trade centers since very long time ago and traditionally it has
been discharged in rivers, flood channels and underground water acquifers. This
trend was polluting these precious and limited underground water acquifers and
was turning them into dangerous and extremely polluted resources . We can hope,
by carring out this project and properly collect and discharge waste water, to
be able to manage these environmental disasters and prevent Tehran citizens from
bringing into operation the sewage tunnels and main transfer lines and by
transferring urban produced waste water to south Tehran waste water treatment
center, a gaint step toward increasing public health will be taken. This process
will have a definite effect on reduction of medical treatment costs of fighting
various illness, plus it will provide a change to reinvigorate underground
water tables and also prevent farmers form irrigating the vegetable crops by
row - waste water. A favorable condition for expansion of urban greenery and
freshening its weather are also consider other by- product of implementing of
utilizing 9000 km of main and auxiliary
network, almost all of waste water which is produced in households will be
transferred to various waste water treatment centers. This will also makes it
possible to transfer produced waste water from northern parts of Tehran to
southern areas and after treatment to utilize it for agricultural purposes.
conditions which exist in Tehran like heavy traffic in main streets, ground
slope, variable types of soil and also lack of underground installations
diagrams, created various problems. Some other problems that were faced, were
old Qantas of Tehran, water, phone and natural gas installations and unstable
soil. These and other challenges were solved and removed by innovative and
perseverance approaches of Tehran waste water company.
main waste water line for west of Tehran;
waste water line is considered one of the most important part of Tehran waste
water system. Its length is 40 km and it is completely implemented. This
massive project which start at Velanjak and Mahmudeyah areas – specifically at
Paseyan Ave goes through Vali-Asr, Fatemee, Hajab , Aboureehan ,Jumboree,
Kargar, Modares, Shoosh, and Shaheed rajaee avenues and ends at south of Tehran
waste water treatment center.
bringing this line into operation , primary estimates shows more than 11000 hectares
of north western, central, and south western parts of Tehran will be Go under
the coverage of waste water network. Discharge rate of this line at connection
point to treatment center will be 4.2 m3/s, the average depth of excavation is
estimated up to 7 meters.
different sections of this network, various types of pipes have been used, from
concrete pipe with exposit coating to polyethylene pipes of various size from
1200 to 2000 mm diameters. in Velanjak and Mahmoudeyah areas, pipes from 600 to
800 mm diameters have been utilized . Polyoratan was selected as main internal
coating agent after necessary tests were conducted.
A fine example of above mention approaches was
the problem which surfaced at junction point of west waste water line with an
old Qanat in front of National Radio and Television center. A large volume of
water seep through excavation site, with innovative solutions proposed by
project executives , a internal shell case was constructed for the Qanat and
implementation of project was successfully continued.
junction has to be put in place and the whole project has to be done at night.
Once the work permit was issued, several workshop were simultaneously brought
in operation and each workshop was held responsible for one section of the
whole job .The whole project was well organized and we were able to finish the
job within the specific time Frame.
main wastewater line is completed, it has enable us to connect auxiliary
constructed network in various northern areas like Velenjack, MahMoudeyah, Zafaraneyeh , Western and eastern
shoulders of Vali-asr ave and in Central area like Fatemi square ,Hejab Ave,
Wayside Abourayhan ave and in southern area like Kargar, Shoushe, Shaheed Rajaee
example of innovative approach to solve problems was at junction point of
shaheed Gomnam and Golhal square which we confronted, traffic police only allow
the crew to work between 11 P.M. to 5 A.M.
due to heary traffic in that area. A 320 meters
during construction phase of this line, difficult jack piping method was
utilized, but because of proper planning, the project did continued. In some
areas we were faced with heavy traffic and round the clock BRT bus system and
also in some area we were faced with fine sand slid.
difficult part of construction of this 40 km long west pipe network that we
faced were 10km in Ghale morghee section and between vanak square till parkway
completion of this line, auxiliary network which cover over 11000 hectors and
almost 2 millions inhabitant of Tehran were brought under this environ mental