WATER & WASTE TREATMENT INDUSTRY FOCUS RISING TO THE POLLUTANT CHALLENGE
The trials follow on from successful work between Anglian and Hydro International with DynaSand filtration technology to reduce phosphate discharges on the Norfolk broads. Paul Barter, principal process engineer
Anglian Water’s £3 million investment to protect and improve water quality and meet Water Framework Directive targets at one of its plants in Norfolk is being delivered with a sand filtration technology solution from Hydro International
T
he Hydro International solution at the Watton Water Recycling Centre
includes the supply of six DynaSand Oxy vertical sand filters which have been designed to optimise ammonia removal from treated effluent discharge. The filters will also form part of an Environment Agency (EA) national trial into more effective reduction of total phosphorus content from treated waste waters. Hydro International has worked closely
with Anglian Water’s project team to develop a detailed design solution for the site as part of the plant upgrade. The wastewater treatment plant serves the rural Norfolk town of Watton and outlying villages. In a rich farming area, with relatively low rainfall and slow river flow, there are particular challenges to keep pollutants such as ammonia and
phosphorus out of the biosphere. Bill Measham, project delivery manager, WRNI (Water Recycling Non Infrastructure) for Anglian Water explained: “Watton WRC has been identified by the Environment Agency under “no deterioration”. This means that to prevent its discharge consent status deteriorating, additional measures are needed to address ammonia levels in order to sufficiently treat all required flow, meet discharge consents and maintain the quality of receiving water bodies. “Anglian Water is also taking part in a
national Environment Agency phosphorus removal trial and we are working with Hydro International to use the new DynaSand filters in a year-long optimisation trial with the very low target of 0.1mg/l of total phosphorus.”
Hydro International has worked closely with Anglian Water’s project team to develop a detailed design solution for Watton WRC as part of the plant upgrade
for Hydro International’s European Wastewater Division said: “We are delighted to be working with Anglian Water on this innovative project. DynaSand Oxy provides proven and effective technology for ammonia removal and at the same time, the DynaSand filter action is excellent for removal of fine suspended solids as part of tertiary polishing of final discharges. Introducing ferric sulphate solution to the effluent enables phosphate to be rapidly converted into solids that can be easily removed by the DynaSand filter.” Measham added: “The current practice
at Watton is to inject ferric salts after the primary treatment. This enables the works to average comfortably under the 1.0 mg/l consent. The inflow to the new DynaSand Oxy filters will be from the secondary humus tank. We will be adding ferric salts at this point to see how low we can get the total phosphorus content and after the year’s trial, the plant will revert to the current level of treatment, but we should have much data on the performance of this promising solution.” Six DynaSand Oxy DS7000 AD HD filter
units with associated compressed air and oxygenation equipment are being installed at Watton. Hydro International project teams are supporting the design, installation and full commissioning of the filters. Other plant improvements include inlet screen replacements and new hydraulic equipment.
Hydro International
www.hydro-int.com
CONDITION MONITORING KEEPS PUMPS WORKING AT TREATMENT PLANT
The Perlenbach water supply association supplies fresh drinking water every day to around 50,000 residents across seven municipalities in the Eifel region of Germany. This equates to around 2.4 million cubic metres of water per year, which needs to be filtered and treated using complex methods. The increased noise and vibration levels on two centrifugal pumps at the water treatment plant were potentially caused by bearing defects, which can
result in pump failure, posing a threat to water supplies. To prevent this, Perlenbach decided to change from regular patrol pump monitoring to a continuous online system – the objective being the early detection of any signs of wear or damage to the bearings before the pumps failed. Schaeffler and its local partner KSA recommended the FAG SmartQB system. As part of a pilot project, two centrifugal pumps were fitted with two
SmartQB sensors (for measuring vibration and temperature) and connected via one FAG SmartQB. In the event of any bearing defects, the FAG SmartLamp installed next to the FAG SmartQB illuminates red and the system generates an alarm message. With only two additional clicks on the touchscreen display, the maintenance technician can view more detailed information about the fault and is provided with specific recommended actions. Thanks to the information provided by FAG SmartQB and its automatic fault assessment feature that gives an early warning of the onset of any bearing damage, maintenance personnel are now able to react quickly and in a targeted manner. Both bearings in the 8-stage centrifugal pump were replaced in a very short time, which prevented severe
damage to the facility. Unplanned costly downtime and potential damage was therefore prevented. The pilot project was so successful that Perlenbach is currently considering fitting sensors to additional pumps and integrating the FAG SmartQB system into its internal maintenance alarm management system. Schaeffler
www.schaeffler.co.uk
PROCESS & CONTROL | NOVEMBER 2016 21
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