WET News

26 WET NEWS OCTOBER 2016 Sweeping out debris from stormwater run-off Any specified input rate can be handled by changing the base tank size to take the correct size HydroBlox walls Final cleaning of the filtered water using Smart Sponge to remove the hydrocarbon content The Smart Sponge, located inside an Ultra Urban Filter, can remove up to 95% of all oil contaminants present in stormwater run-off or similar wastewater flows SNAPSHOT Water treatment MORE... 1 2 3 4 1 Picket fence thickener A&J fAbtech www.AJfAbtech A&J Fabtech is offering a range of styles and sizes of picket fence thickeners for water treatment and industrial applications. It also offers packaged plants with drive as well as access stairways and platforms. 2 intelligent wAter SuPPly Xylem www.lowArA.co.uk Xylem has launched ResiBoost, an intelligent variable frequency drive that matches system demand to maximise pump efficiency and minimise general wear and tear. 3 level meASurement endreSS+hAuSer www.uk.endreSS.com Endress+Hauser's new Micropilot FMR10 free-space radar offers all the benefits of non-contact radar level measurement at a fraction of the cost. 4 flow conditionerS vortAb www.vortAb.com Vortab Flow Conditioners ensure a smooth flow profile for accurate measurement by flow meters, which often must be installed in close proximity to pumps. • Naylor Drainage's Smart Sponge and Hydroblox solutions take the contaminants out of onsite water treatment. N aylor Drainage has developed Smart Sponge and Hydroblox for onsite water treatment technology, and a permanent solution for land drainage, ground stabilisation, green infrastructure and filtration, respectively. Smart Sponge offers a host of environmental, money- saving uses in a variety of areas of water contamination. The standard Smart Sponge material is effective in absorbing and locking in polluting hydrocarbons and oil derivatives from surface water, whilst still allowing high flow- through rates. The technology can remove up to 95% of all oil contaminants present in stormwater run-off or similar wastewater flows and can, dependent on viscosity, absorb up to five times its own weight of hydrocarbons, thereby transforming the contaminant into a solid waste with lower disposal costs. HydroBlox is 100% manufactured from end-of-life recycled thermoplastics, and does not clog, is easy to install and handle, requires little or no maintenance, and is high strength as well as long lasting. Joint venture The two products have been in action on the M25 J30/A13 Corridor Relieving Congestion Scheme (CRCS), being under- taken by a joint venture between Balfour Beatty and Skanska. The £79.3M project will open in The design of the M25 J30 A13 CRCS Road Sweeper Water Treatment Facility was a low- tech solution given the amount of waste it was required to handle. The facility comprised a concrete base tank incorporating two separating walls that created varying sized settling tanks. Two Hydroblox porous walls separated the settling tanks. The first wall allowed the water offloaded from the road sweepers to pass through with solids of 5mm or less. Heavier solids settled in the holding tank under gravity before reaching the porous wall. Flows Flows through the first wall entered the second tank area, which had a second HydroBlox wall as its lower outlet. This wall was designed to allow flows through with particles up to 30 microns. Flows then entered the third tank where these fines settled out. Run-off from the final holding tank area was taken off via a small diameter pipe that led into an Ultra Urban Filter containing the Smart Sponge. The hydrocarbon and heavy metal elements of the water flow were removed before the water entered a final holding tank from which it could be recycled. At the second HydroBlox wall, the facility handled significant throughput rates of up to 27l/s/m 2 . "The water quality achieved through the treatment process was accepted by the Environment Agency for reuse as dust suppression and further road sweeping which allows the project to reuse around 30m 3 of water per month" Graham Taylor, Balfour Beatty/Skanska JV 2017, and is to address capacity problems at M25 J30 on the A13 through J30 and to the junction with the A126. To ensure adjacent and surrounding roads remain open and safe, there has been a continual clean-up programme using road- sweeper / gulley cleaning trucks to remove detritus from the works areas. A schematic of the Road Sweeper Water Treatment facility used on the M25 J30 project In April 2016 alone, some 28,000l of water were treated and reused. This water would have had to be sourced elsewhere had the treatment plant not been used. The onsite treatment plant provided considerable savings in diesel, time and waste disposal costs as the road sweepers undertook zero journeys to tip at an offsite waste facility. The facility offered savings in excess of £110,000 over one year. Once decommissioned all concrete and masonry can be crushed and recycled for use in a new project reusing the same materials. The HydroBlox plank sections, Smart Sponge and pipe can be reused on a similar site or project elsewhere. Challengeing waste- stream Graham Taylor, senior environmental advisor for the Balfour Beatty/Skanska JV: "The ultra-urban Smart Sponge and the Hydroblox product provided the exact solution to managing a challenging waste stream. "The water quality achieved through the treatment process was accepted by the Environment Agency for reuse as dust suppression and further road sweeping which allows the project to reuse around 30m3 of water per month." Contact: Naylor Drainag WEB: www.naylor.co.uk

• Cover