The third and final stage of the Al Ansab Sewage Treatment Plant expansion is set to begin in Oman, following completion of Phase 2 works.

The sewage treatment plant, located in Muscat, is getting a multi-phase expansion as the Gulf country looks to address rising demand for water treatment, which has been partly caused by growing urbanisation in the country's capital city.

Developer Haya Water said it would commence Phase 3 activities soon, suggesting all work on the plant would come to end in 2022. It did not disclose any information about the scope of work for Phase 3.

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The project's Phase 2 expansion has increased the plant's capacity by up 125,000m³ per day, according to Haya Water. This is significant when considered that the plant, built in 2010, had a capacity of 57,300m³. 

Once Phase 3 is finished toward the end of 2020, Al Ansab Sewage Treatment Plant will have a capacity of 140,000m³.

Haya Water said the second phase of the expansion project was completed with three million man-hours worked without a lost-time injury (LTI), an important health and safety benchmark in the construction industry.

Al Ansab Sewage Treatment Plant is equipped with membrane reactors and is believed to be one of the largest in the world to make use of this technology, according to Oman's state news service.

Earlier this year, US-based Aecom picked up the Infrastructure Project of the Year award at the Construction Week Oman Awards 2017 for its work on Al Ansab Sewage Treatment Plant.