Oman Wastewater Services Company (Haya Water) has received statements of qualification to bid to build a wastewater treatment plant at Al-Amerat, Muscat governorate.

The winning bidder will design, build, operate and maintain the wastewater treatment plant, pumping stations and treated sewage effluent works at Al-Amerat. It will also provide related works in the form of a tanker facility, sewage pumping stations, rising mains, treated effluent storage reservoir and treated effluent pumping station.

The treatment capacity to be installed in the first phase is based on an average annual wastewater flow of 18,000 cubic metres a day (cm/d), and this is expected to meet demand until about 2028. However, the design and layout of the project will provide for future expansions of capacity to meet projected demand in 2050 based on an average annual influent flow of 36,000 cm/d.

Al-Amerat sewage treatment plant will use membrane biological reactor technology. The treated effluent storage reservoir will have a capacity of 16,000 cubic metres, which equates to about one-day capacity at the design flow rate. A pumping station and pipelines for transmitting treated effluent to reuse distribution networks will also be constructed by the contractor.

The following companies responded to the request for qualification:

• GS Engineering (South Korea) and Korea Environment (South Korea)
• Al-Hassan Engineering Company (Oman) and Cadagua (Spain)
• Galfar Engineering & Contracting (Oman) and VA Tech Wabag (India)
• Degremont (France) and Al-Ansari (Oman)
• Eagle Electromechanical Company (Oman)
• Hitachi Plant Technologies (Japan)
• Besix Sanotec (Belgium), Six Construction (Belgium) and Oryx (Oman)
• Metito (UAE) and Mohammed Abdulmohsin Al-Kharafi & Sons (Kuwait)
• Towell Infrastructure Projects (Oman) and Aqualia (Spain)
• Larsen & Toubro (India) and Waterleau (Belgium)
• Tecton (UAE) and Acwa (Saudi Arabia)
• OTV (France) and Bahwan Engineering Group (Oman)

Al-Amerat is the second largest of Muscat’s wilayats, or governorate districts, with a total area of 992 square kilometres, and the fourth-most populous. The population in Al-Amerat has been projected to reach 110,000 by about 2025. Based on the Housing Ministry’s plans, the population in Al-Amerat wilayat is expected to eventually exceed 260,000.

Haya Water plans to improve the wastewater system in the area and the treatment plant is the first step. Contracts for three sewer and effluent pipeline contracts are also being tendered to cover the western, northern and eastern areas.