Water. Desalination + reuse
Issue link: https://fhpublishing.uberflip.com/i/983801
Water.desalination+reuse June 2018 On Site 15 Meeting Today's and Tomorrow's Water Challenges We're helping to make water safer and more accessible, food taste better, pharmaceuticals more effective and industries more efficient and spearheading the development of sustainable technologies that integrate water and energy requirements. Dow Water Solutions ®TM Trademark of The Dow Chemical Company ("Dow") or an affiliated company of Dow www.dowwatersolutions.com including power and gas installations. "The design is a little bit complicated for the intake and pumping station because we need always to find the gaps in between the neighbours," explains Keil. The main design challenge was how to fit everything onto the compact site. In the consultant engineer's original designs, much of the process buildings were foreseen as two- storey in order to accommodate all the process equipment. "That makes the whole structure more expensive to build. Through our experience as a contractor and designer, we could optimise certain buildings and structures, and together with Acciona, we saw how we could fit the process into it, and we were able to put everything onto the ground floor, and could be very competitive with that," says Keil. As part of the design process, Besix was able to draw on its back catalogue of experience in building power and water plant intake infrastructure systems, including referring to how other customers had asked to solve similar puzzles. "This made us very competitive, and enabled us to stay fully compliant with the specifications and requirements of both the client, DEWA, and its consultant, ILF," he adds. The solution that was found to keep all the buildings to one-storey (apart from a small administration and electrical building), also has a positive effect on the cost to DEWA of owning and operating the plant over the coming 25 to 30 years. "Just imagine, if you need to pump your water onto the first floor, the cost of extra pumps, electricity. We are saving on that cost every day for 30 years. The approach that we took was, 'what if I had to operate it for the next 25 years.' If you think like that, you will challenge yourself in a much smarter way," Keil says. The main process structures, the brine concentration, Dissolved Air Flotation (DAF), the dual media filtration, the reverse osmosis (RO) building, the calcite filter, the chemical building, and the flush treatment, as well as the RO clean- in-place, the electro-chlorination drainage — in the original plans, all these were to be on top of each other in a two-storey building that would take up about 60 percent of the plot, and the rest, the le and right legs, would be for the potable water storage tank, the outfall, and the electrical building. We swapped the le and the right leg. We put the tanks and electrical buildings on the opposite side, and having done so we discovered that we had the electrical building much closer to where we have the high pressure pump, and then we reconfigured our process: If you have two rectangular shapes and turn them around by 90 degrees, you can try to fit them into a particular framework, and this is what we have done. We were able to fit everything into the perimeter quite comfortably. Rolf Keil, project development manager, Besix Concessions & Assets