Step Tunnel ( Strategic Tunnel Enhancement Program )

Abu Dhabi,United Arab Emirates

Location Abu Dhabi, UAE

Client Abu Dhabi Sewerage Services Company

Contractor Kharafi National

Consultants CH2M Hill International

Duration February 2017 till date



The concept of the proposed Strategic Tunnel Enhancement Programme (STEP) system is to use a series of link sewers to intercept flows from existing gravity sewers upstream of the existing pumping stations and transfer the flows by gravity into the deep tunnel sewer, thereby providing relief to the existing main collector system. These flows will again be transferred by gravity via the deep tunnel sewer to centralized wastewater treatment facilities strategically located at Al Wathba, at the southern end of the metropolitan area of Abu Dhabi. Odour control is a key component of STEP. A centralized odour extraction approach was initially recommended and validated through detailed modeling. However, ADSSC required greater certainty regarding the volumes and movement of air within the tunnel and link sewers so it directed that physical modeling be conducted to quantify air entrainment values at drop structures and further evaluate centralized versus regional odour extraction system approaches. As an outcome, a regional odour extraction system is implemented at tunnel work shaft WS-4 and at shaft WS-7, with a two stage treatment consisting of bio-trickling filters followed by carbon polishing.

Abu Dhabi, United Arab Emirates
Abu Dhabi, United Arab Emirates
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