ROI: The expansion project is expected to save over US$1 million per year at an energy cost of 10 cents/kWh |
evaluation of Submerged ultrafiltration membranes
During the pilot study, plant operators evaluated the submerged ultrafiltration and pressurized ultrafiltration technology. It was revealed that the submerged design is only 70 percent of the footprint of the pressurized ultrafiltration solution.
The submerged membranes use only a gentle vacuum to suck water through the membranes at a low flux, eliminating the need for feed pumps. The Sulaibiya expansion is projected to save over US$1 million per year, at a low energy cost of 10 cents per kWh.
The submerged ultrafiltration system can go longer between cleanings so chemical costs are also lower. With a longer membrane life, submerged ultrafiltration membrane replacement costs are also lower. A submerged ultrafiltration plant also has less valves (280 vs 400) and piping. Less moving parts typically means lower costs for installation, maintenance and spare parts.
The Sulaibiya project will convert over 600,000 m3/day of municipal effluent wastewater into high quality reclaimed water that will be used for agriculture. This provides an alternate source of water for agriculture instead of using potable water needed for Kuwaiti residents.
The combination of UF and RO technologies provides bacteria, virus and TDS removal, producing high quality water for non-potable water applications. This project provides a benchmark and catalyst for the successful implementation of similar water reuse projects in the Middle East, which are particularly relevant due to the scarcity of water in the area.
Using submerged UF membranes, the Sulaibiya plant is able to realise both capital and energy cost savings. Over the lifetime of the concession, the plant will generate savings of around US$11 billion and will turn water reclamation into an economical and environmentally friendly source of non-potable water use.
Derek Senior is senior product manager, GE Water & Process Technologies. SUEZ, together with Caisse de dépôt et placement du Québec, closed their purchase of GE’s Water & Process Technologies on September 30, 2017. The new business unit is SUEZ Water Technologies & Solutions.
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