Phase 2 of the Jebel Ali Sewage Treatment Plant (JASTP) project is the latest AECOM strategic win in the wastewater treatment sector, adding to the company’s portfolio in terms of studies, design and supervision of major STP projects.The project provides an average treatment capacity of 375,000 cubic metres day (equivalent to the wastewater generated by 1.35 million persons) and forms part of an ambitious vision by the client, Dubai Municipality, to build an ultimate treatment facility of 1,050,000 cubic metres per day at the Jebel Ali site.

Located on a 670 hectare desert site to the southeast of Jebel Ali, the second phase will complement the first phase – with a capacity of 350,000 cubic metres per day – as well as improve on the existing processes.  The treatment process is based on a conventional activated sludge Modified Ludzack-Ettinger (MLE) system with grit removal and preliminary settlement processes upstream, as well as clarification and tertiary treatment downstream.  A sodium hypochlorite disinfection system is proposed to be used for its beneficial features instead of the use of chlorine gas known for its adverse residual properties.  The tertiary treated water resulting from the process is partially used to clean the structures and the bulk is used for irrigation purposes downstream of the plant after pumping.  The solid sludge is thickened, digested and dried and then hauled off the plant in trucks for use as a fertilizer.

AECOM is supervising contractors Besix-L&T on this monumental project.