introducing main facilities of tehran waste water project

Introduction;

Implementation 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. 

The 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.

This 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.

Finally in 2005, Tehran Water and Wastewater Company was able to receive 145 M$ which was the first phase of a loan from International Bank.

 

Qualitative objectives:

1- Protection of the environment

2- Promotion of public sanitary level

3- Preventing contamination of und-erground water resources considered as a part of water supply reservoirs.

4- Transferring heavy costs of medi-cal treatment to the low costs of dis-ease prevention

5- Expansion of green zones and clean air to improve public behaviour in a delightful surrounding.

6- Preventing usage of raw sewage in irrigation, (this problem is already solved)

7- Changing water consumption trend from a single wa-steful cycle to a multiple and useful cycle.

8- Replenishing water beds around Tehran with the effluent.

Tehran 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 afflictive illnesses.

By 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 this project.

By 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.

Special 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.

Introducing main waste water line for west of Tehran;

West main 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.

By 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.

In 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.

Long 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.

Since this 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 avenues.

Another 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

 

While 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.

The most 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 area .

After completion of this line, auxiliary network which cover over 11000 hectors and almost 2 millions inhabitant of Tehran were brought under this environ mental sanitary project.  

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