Treat wastewater so that it could be used for irrigation purposes in the minicipality of Najran.
As the main contractor on the project, WETICO was responsible for civil and electromechanical works. The civil works comprised installing four valve chambers, one receiving channel, one inlet structure, two equalisation tanks, two anoxic tanks, two aeration tanks, eight membrane biological reactor tanks, two treated water tanks, four air blower buildings, a dewatering building, a control building, a workshop and store, and a guardroom.
The electromechanical works included inlet structure equipment, twelve submersible mixers, an air diffusing system, 640 membrane biological reactor modules, the most used in a single project in the GCC, three dewatering units, 40 pumps, a supervisory control and data acquisition system, remote monitoring units, motor control centres, a fire alarm system, a telephone system, medium and low voltage cables, and control cables.
Membrane biological reactor modules are very sensitive to high temperatures and to sunlight, which complicated the installation process. The project was concluded on time, and the tanks were covered with sheet and filled with water to ensure their protection.