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Tribune News Network
The Public Works Authority (Ashghal) is participating in Qatar’s first international environmental exhibition, EnviroteQ, organised by the Ministry of Municipality and Environment, highlighting its key eco-friendly projects and initiatives.
Through its pavilion, Ashghal is keen to present a number of its initiatives aimed at achieving sustainability of projects and environmental preservation by implementing green buildings, recycling of demolition, drilling and tyres waste, and their use in road projects, besides using treated sewage water for irrigation, beautification and agriculture.
Sewage treatment
Ashghal has 6 main plants and 17 small plants for sewage treatment that use advanced treatment and sterilising techniques to provide clear water for irrigation and landscaping.
The Doha North Treatment Plant (DNSTW) of Ashghal is considered the largest wastewater treatment facility in the region, and the first facility developed with a thermal drying plant. The plant is designed to produce 245,000 m3 of treated water per day, and is surrounded by more than 90,000 trees, 50 picnic areas and bird watching ponds.
In 2017, the DNSTW received the MEED Quality Award for Sustainability, and was recognised as the Water Project of the Year. The plant uses thermal drying to produce USA EPA Grade A pellets, which are used as fertiliser in landscaping. This process significantly reduces the amount of biosolids going to the landfill.
In order to reduce the wastage of drinking water, Ashghal provides its customers with high quality treated wastewater for other purposes, such as cooling, landscape irrigation, fodder cultivation, road beautification, and cleaning sand used in construction and road projects. Clients currently using this service include Qatar Cool, Qatar Foundation, public farms and Baladiya.
Recycling construction waste
In order to achieve sustainability in projects and reduce the cost, Ashghal has launched a number of initiatives including the usage of recycled construction materials in its projects, such as asphalt waste, crumb rubber, steel slag and demolition and drilling waste. It has contributed to reducing the cost of materials used in its projects by 15 percent.
Ashghal started to collect excavation and demolition waste 5 years ago, and has succeeded in using approximately 60 million tonnes of demolition waste in various projects.
Crumb rubber recycling
With the amount of waste tyre increasing at an alarming rate of around 1.9 million tyre frames every two to four years, it poses a major problem contributing to environmental pollution in Qatar. In order to sort out the issue, Ashghal’s Road Project Department started an initiative to grind up waste tyres and process them into crumb rubber. It is then incorporated as a modifier into asphalt concrete mixes for use in construction of roads, parking lots and other areas.
The benefits of Crumb Rubber Modified Asphalt Pavement are increased resistance to rutting, reduction of pavement fatigue cracking (reflective cracking), reduction of pavement noise (Quiet Pavement) and increased flexibility and durability.
Environmental sustainability in building projects
Ashghal designs the new health centre buildings according to the highest quality and safety standards, in line with the criteria set by Global Sustainability Assessment System (GSAS). It seeks to accomplish a 3-star environmental level in terms of energy saving and environment preservation.
These include using solar energy for in-house water heating, using natural sunlight through panoramic roof windows, allowing sun light in to save electricity used for lighting and to disinfect the place.
This is in addition to the rational consumption of water inside and outside the building, growing green areas and landscapes around the facility, and preserving the environment around during the implementation of the project.
Ashghal was granted two Sustainability Awards (2016) in health and education facilities by the Gulf Organization for Research and Development ‘GORD’, the first performance-based system in the MENA region.
Air quality laboratory
At the exhibition, Ashghal is also displaying a mobile unit for air quality monitoring. The unit assesses air quality at the authority’s projects. It measures all types of emissions, odors and oxygen content in the air, as well as noise rate and percentage of chlorine gas in the atmosphere, in order to maintain the health of workers at project sites and reduce air pollution.
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