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 treatment capacity to meet projected demand in the year 2050, corresponding to an average annual influent flow of 36,000 cm/d.

Al-Amerat sewage treatment plant will use membrane biological reactor technology in a biological treatment configuration based on the Modified Ludzack-Ettinger process. 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)
• Al Hassan Engineering Company (Oman)
• Galfar Engineering & Contracting (Oman)
• Degremont (France)
• Easgle Electromechanical Company (Oman)
• Hitachi Plant Technologies (Japan)

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 significantly in this area. The wastewater project is the first part. Contracts for three sewer and effluent pipeline contracts are also being tendered to cover the western, northern and eastern areas.