WET News

MAY 2017 WET NEWS 21 FOLLOW US SUPPORTED BY SPONSORED BY @WWTlive #energyinwater DRIVING COST-EFFECTIVE ENERGY MANAGEMENT IN WATER The 4th annual WWT Water Industry Energy Conference brings together water industry professionals tasked with managing and generating energy and building resilience into their businesses. ● Learn how your peers are overcoming regulatory challenges to enhance energy efficiency ● Find innovative ways to optimise existing assets and maximise the power of people ● Gain insight into which renewables and technologies you should be investing in Trevor Bishop Director, strategy and planning Ofwat Paul Baxter Head of energy and renewables Severn Trent Water Per Overgaard Pedersen Chief engineer Aarhus Water (Denmark) Anne-Marie McDonald Optimisation manager Southern Water Steve Kaye Head of innovation Anglian Water Ester Rus Perez Sludge and energy innovation manager Thames Water Alastair Tawn Wastewater energy and efficiency manager Northumbrian Water EXPERT SPEAKERS INCLUDE BOOK NOW events.wwtonline.co.uk/energy 4 TH ANNUAL INDUSTRY ENERGY 13 JUNE 2017 | BIRMINGHAM WATER CONFERENCE THE CONCEPT • Multi-layer screens providing a significantly larger open area • The filtration plant will be designed to filter a 10% stream of the cooling process • A 20 micron screen system will incorporate a special spring loaded nozzle cleaning system • A high efficiency hydro cyclone will serve as a pre-filter during normal operation and act as a primary filter during the periods of significant solids reliability of flow measurement data NEED TO KNOW 1 A sandstorm consists of a massive amount of particulate in the air 2 It has a significant effect on a person's health, and can cause serous respiratory problems 3 The main source of sand and dust storms originates from Iraq where the flow of rivers has decreased 4 A race in dam construction in upstream countries has impacted the flow of rivers THE VERDICT "Analysis has shown that if we target 20 micron this will remove the majority of the sand that we expect will be collected and a continual recirculation will produce a filter cake that will further improve removal performance" Andy Evans, Amiad Water Systems UK A sandstorm comprises a massive amount of particulate in the air multi-layer screens," says Evans. "Effectively, by multi- layering we are providing a significantly larger open area. However, even with this inherent solids holding capability, when cooling systems are subjected to the conditions of sandstorms filters can still become compromised. "Typically under sandstorm conditions filter systems will be isolated or become overwhelmed. Therefore the actual design of a filtration plant must take into account the effect of a smaller open filter area. The result of which can seem to the inexperienced a considerably oversized plant for relatively small flows." Putting the design to the test, Amiad Water Systems UK was commissioned recently by a Middle East producer of industrial gasses to design and build a 6 off complete skid- mounted, two-stage filtration plant with a removal capability of 20 micron, manufactured to meet the rigorous ASME compliance. Evans says: "The plant will be designed to filter a 10% stream of the cooling process associated with the gas production. It will be located outside in order to be in close proximity to the process and enable it to directly couple to an existing pipework system. "On the plus side, the plant will be shaded from the high ambient temperatures experienced in this region but otherwise it will be subjected to all the elements that this environment delivers whilst still operating 24 hours a day, 365 days a year. Bearing in mind construction, compliance and a 20 bar pressure design and you've got a considerable challenge to meet." Evans says elevated pressures bring backwashing complications as high pressures are discharged to atmospheric pressure during the backwash process. "Analysis has shown that if we target 20 micron this will remove the majority of the sand that we expect will be collected and a continual recirculation will produce a filter cake that will further improve removal performance." The filtration technology will combine a two stage approach: • A 20 micron screen system incorporating a special spring loaded nozzle cleaning system designed to remove organic material and very fine sand • A high efficiency hydro cyclone which serves as a pre-filter during normal operation and act as a primary filter during the periods of significant solids expected to be seen during sandstorm As sandstorms can happen without much warning an integrated control system will monitor solids loading on the 20 micron screen and automatically remove and insert it from the system during extreme conditions. This process is all automatic with the telemetry of the system continuously reporting system status back to the engineers. Enric Terradallas, of the Sand & Dust Storm Prediction Centre at the World Metrology Organisation

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