Project Name: Wadi Hanifah Restoration Project
Location: Riyadh, Saudi Arabia
Project Type: Water Quality Improvement - Bioremediation System (BRS)
Completion: May 2009
The Wadi Hanifah Restoration Project (WHRP) is a unique natural and geographical feature in the dry central highlands of Saudi Arabia. With a catchment area of 4,500 sq.km and a 120 km long main water course, the Wadi offers landscapes that are diverse and extreme. Part of the desert watershed traverses the western portion of Metropolitan Riyadh, one of the fastest growing cities in the world. Beyond the high-rise towers of urban Riyadh, the wadi region includes large industrialized farms, date palm plantations, two (2) significant archaeological sites, and bedouin villages.
In recent years, the rapid expansion and urbanization of the Saudi capital turned parts of the Wadi into a wasteland. Some areas were quarried and mined for construction materials to build the growing city. Others are dumping grounds for rubbish. Residential subdivisions, infrastructure, and expressways encroach upon the Wadi. Pollution, poor water quality, and water related diseases proliferate due to inadequate infrastructure and lack of development controls. Due to this contiuous degradation of the natural biological and aesthetic value of Wadi, the Arriyadh Development Authority (ADA) came up to a decision to protect and improve the current condition of Wadi Hanifah.
Nelson Environmental Inc. has had extensive involvement in developing, designing and implementing the river water quality improvement system (bioremediation process). Objectives of the process were as follows:
The Bioremediation Facility is the integral part of the Wadi Hanifah Restoration Project. The main treatment process of the water will take place in this area by enhanced biological treatment process.
The three main goals of the system are:
The main components of the BRS are as follows:
The system is designed to treat the water biologically and to assimilate the excess nutrients in to higher level of food chain. The process is being enhanced by the aeration system which supplies the system with high level of dissolved oxygen (DO), which is needed by microbes, fish and other aquatic organisms. Artificial Periphyton Benthic Substrate provides efficient substrate for beneficial bacteria essential biofilm micro community (algae, zoo plankton,ect.) which serve as food for fish communities.
The bio facility is effectively achieving the system goals since commissioning in May 2009. The system performance data as follows: