Fallujah Sewerage System, Iraq

Scheduled to come into operation in mid-2008, Fallujah’s first-ever integrated sewerage system is the largest project to be overseen by the US Army Corps of Engineers in Al Anbar Province, and forms part of the extensive reconstruction programme of post-war Iraq.

The main element of the project is the city's new wastewater treatment plant (WTP), which has sufficient additional capacity to accommodate a 50% population growth.

Other components of the scheme include the provision of an extensive collection system, a trunk main sewer and associated pumping stations.

The final project cost will be around $85m.

BACKGROUND

Currently, only around 6% of Iraq’s 27.5 million population are served by wastewater treatment plants. Located some 69km west of Baghdad on the River Euphrates, Fallujah – like many of the country’s cities – relies on individual septic tanks. This has often led to raw sewage leaking directly onto the streets or into storm drains, which ultimately discharge into the river. With the Euphrates offering an important source of drinking water to settlements downstream, there are clear problems of contamination.

The project seeks to rectify this issue while providing much needed jobs in areas of high unemployment. Around 450 Iraqis have been working on the project throughout 2007, with a further 250 expected nearer the 2008 completion date.

THE SCHEME

The current programme includes the installation of 30,000m of sewer lines in the south-west of the city, and will initially serve about 3,000 homes. However, this represents only the first phase of an ambitious city-wide system that will ultimately extend to connect all of Fallujah’s households to a central sewer network.

The work is made of 13 separate contracts and involves both city and national officials in addition to the project management team and contractors. Once the project has been completed, these same officials will eventually take over operation and maintenance of the new sewer system.

Two large capacity pumping stations – capable of handling flows of around 150,000m³ per day – have been constructed to pump wastewater from five collection systems to a trunk collection network, which forms the backbone of the new infrastructure.

Treatment at the new WTP follows an essentially conventional approach of screening, biological processing and settlement. On arrival at the plant, influent wastewater will pass into inlet tanks before flowing onto aerated grit and oil removal tanks.

The flow will then pass through aeration tanks towards the settling tanks. Settled solids will be removed for separate disposal, while the effluent is disinfected in a chlorination contact chamber before finally being discharged into the Euphrates River.

To ensure the long-term viability of the new plant and infrastructure, a team of engineers and other specialists are working throughout the project to check the quality of the ongoing construction and promote safe working practices – issues seen as key to the project’s success.

Ultimately, the provision of centralised sewage treatment will bring major benefits to Fallujah, improving public health and reducing pollution to one of the region’s major waterways.

KEY PLAYERS

The project sponsor is the Government of Iraq through the Ministry of Public Works, with project management and ultimate oversight being the responsibility of the US Corps of Engineers.

Construction is being undertaken by Iraqi contractors and a local workforce, with additional supervision from a team of Iraqi engineers.