WATER CONSERVATION
Vitens process engineer Peter Sjoerdsma with a Berson InLine+ medium pressure UV disinfection system
World’s largest backwash installation adopts reuse
he reuse of backwash water at the Netherlands’ largest groundwater drinking water facility is providing an additional 1.25M m3/year resource. Berson UV’s systems are being used to disinfect reused backwash water from sand filtration units at the Spannenburg water treatment plant. Up to 5% of the drinking water produced at Spannenburg is used to backwash the sand filters and, until recently, this water was subsequently discarded. Following the installation of two Berson InLine+ UV system, this water can now be reused as drinking water, producing considerable cost savings.
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Berson supplied two InLine 250+ medium pressure UV systems, each disinfecting up to 100m3/hour of backwash water. They are positioned after the ultra-filtration units and before the sand filtration. The UV systems produce a 2 log reduction of colony forming units (CFUs), with a water transmittance (T10) value of 63.1%.
Operated by water utility, Vitens, the facility is 35km south of Leeuwarden
and is believed to be the largest backwash installation in the world. The contractor for the project was Logisticon Water Treatment. “A year since it was commissioned the Berson UV systems are working very well and are completely reliable,” comments Peter Sjoerdsma, one of Vitens’ process engineers. “The reused backwash water is completely biologically reliable and we are totally confident to use it as drinking water. “We opted for UV as it is a clean technology that does not require the use of chemicals. Berson’s UV technology is already widely used by Vitens so we have good experience of their systems.”
The Spannenburg plant supplies over 300,000 people spread over a large area of northern Holland. Because the installation has been so successful Berson has also been awarded the contract for an identical application in Zwolle, also operated by Vitens. An important feature of the Berson UV technology installed at Spannenburg is its UV-Tronic+ V5 PLC controller, the latest version of Berson’s UV-Tronic controller range. Based on an industrial PLC and with an RS485-based ModBus interface, the UV-Tronic+ V5 links to the site’s SCADA control system and allows users to set up and manage the UV system’s operating parameters to exactly their requirements.
Monitoring slashes Ricoh Arena water costs
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rena Coventry, a facilities management company, which manages the Ricoh Arena in Coventry, has reduced water consumption and achieved significant cost savings through the introduction of energy and water monitoring equipment. The company originally installed a Micronics Heat Meter in 2008 to establish and monitor the energy costs associated with underground heating of the pitch. This was a success and led to a direct reduction in water consumption. Following a subsequent meeting with Seven Trent, the information gained from the monitoring exercise, combined with clarification that the water used for the pitch heating does not go to sewage, led to a reduction in water charges. A decision was taken to extend the arena’s water monitoring the following year.
Alan Pickering, the arena’s deputy facilities and energy manager, said: “Water consumption is a big issue on the site, which led us to invest in the installation of three Micronics Ultraflo 2000, clamp-on, flow-meters in 2009, which we use with an on-site monitoring and targeting system to manage the significant water consumption on the site.”
The three meters were supplied and installed by Micronics, and provide individual half-hour consumption data for the north concourse, arena and southern concourse areas. Within three weeks of installation, the investment identified intermittent continuous flushing periods of some WCs in the
southern concourse area, which when remedied reduced the site water consumption by 50%, providing a payback of just one month. Micronics meters have also been installed in the new Exhibition Hall to provide consumption data for automatic billing of water consumption for this area, which is shared with co-resident, G Casino. Micronics believes its meters were selected due to the installation and maintenance/service benefits associated with the non-invasive technology, including low cost and minimum disruption installation with no system drain down required plus dry maintenance and service. In conjunction with Pickering’s effective use of the on-site monitoring and targeting system, Micronics has delivered a significant reduction in water consumption and reduced overall costs by 50%. Pickering was very pleased with the performance of the Micronics products. He believes the project shows how Clamp-On - Ultrasonic technology can be implemented as a cost-effective solution to improve heat energy measurement and water management on similar sites.
December 2010 Water & Wastewater Treatment 29
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