Water and Effluent Treatment Magazine
Issue link: https://fhpublishing.uberflip.com/i/644820
20 WET NEWS MARCH 2016 improve performance of the pre-treatment systems and the RO system. New SCADA systems will provide automated controls for the upgraded plant. Flexibility Value engineering has underpinned all aspects of the project. We have designed the new plant for maximum operational flexibility whilst providing good access for maintenance and li•ing for cartridge and membrane change-outs. It is also designed to reduce power consumption and minimise wastewater by decreasing the frequency of filter backwashes, cartridge filter replacements and RO membrane clean in place (CIP) procedures. Noise was also a potential issue and we selected equipment to reduce noise to a minimum, to minimise the impact of the plant on the environment and local residents. Considerations for the marine location were also important. It can be a harsh environment especially in winter and both wear and corrosion alongside ease of maintenance have also to be considered as part of a resilient solution. Duplex and super duplex stainless steel for example are specified for high pressure pumps and pipework and issues are also minimised by installing as much of the equipment in doors as practical. In standby mode, seawater will also be flushed out of the system and preservation fluids ONSITE DesAlinAtion upgRADe TECHKNOW • the Ro membranes benefit from an additional 25% active surface area for the same volume • the plant will only use two streams, each with a high pressure pump and energy recovery device to deliver pre-filtered seawater • A final stage is to condition the seawater using new 5 micron cartridge filters • Duplex and super duplex stainless steel are specified for high pressure pumps and pipework • noise was a potential issue and we selected equipment to reduce noise to a minimum NEED TO KNOW 1 Ro uses hydraulic pressure and semi-permeable Ro membranes to diffuse pure water from seawater 2 Value engineering has underpinned all aspects of the project 3 the project is on track for completion in time for this summer months when the plant may be needed to top up reservoirs 4 the design reduces the energy consumption of the new Ro system by 40% compared with the old set-up THE VERDICT "With the current plant at the end of its serviceable life, ACWA's solution will increase capacity and resilience for the island's public water supply in times of low rainfall and built-in energy recovery will ensure that running costs are lower when the plant is online" Helier Smith, chief executive at Jersey Water the quarry pool, where seawater is stored before treatment the seawater intake pumps and pipework could feed the new system