Environment Protection
SDS Weholite CSO Control Chamber
HDPE pipe- and panel-based pre-fabricated CSO system.
SDS Aqua-Xchange™
Environment Protection
Surface water pollutant adsorption and enhanced filtration media.
Key Benefits
For use in linear developments as a 250mm deep layer beneath standard aggregate.
Increases treatment capacity and reduces downstream flood risk.
Proven to remove and retain dissolved heavy metals.
Can be deployed to control pollution and satisfy requirements of risk assessments for surface water runoff.
Large treatment capacity from small land take.
Minimises costs of materials, on-site machinery and equipment, and labour resource.
Estimated 25-year minimum performance lifespan.
Extended material durability provides long lasting service.
Media-Based Filtration System
SDS Aqua-Xchange™ is an engineered pollution control and enhanced filter media which uses ionic exchange and filtration to remove soluble and solid pollutants from surface water runoff.
Surface water drains normally discharge to a watercourse or indirectly into groundwater either naturally or via a soakaway. Contamination of the surface water by metals, oil, chemicals or other suspended solids, most notably from busy main roads and motorways, can cause these discharges to have a serious impact on the receiving water.
SDS Aqua-Xchange™ is a unique and highly efficient surface water quality treatment solution which comprises naturally occurring, loose granular materials that maximise the pollution adsorption process by enabling stormwater to filter through the product’s large surface area. This prevents surcharging and allows enough contact time for the pollutants to be captured and ultimately retained for future disposal.
SDS Aqua-Xchange™ has been proven1 to capture and retain2 between 99.5% and 100% of copper and zinc toxic metal pollutants, making it especially beneficial in areas with a high risk of metals pollution, and where the water treatment flow rate is greater, such as the road and rail network and industrial estates.
¹ Tests were carried out in accordance with the British Water Code of Practice ‘Assessment of Manufactured Treatment Devices Designed to Treat Surface Water Runoff’.
² Metals retention under the influence of road salt application.
Features and Benefits
Suitable for use beneath a dry swale, rain garden or infiltration basin and as a road- or track-side filter drain.
Suitable for use in multiple high- and medium-risk sites.
Proven capability to remove and retain dissolved heavy metals including copper and zinc.
Can be deployed to control pollution and satisfy requirements of risk assessments for surface water runoff.
Captured metals are retained even when road salt is applied to the catchment area.
Can be used unchanged throughout the year.
Filters out finer solid particles.
Captures pollutants that would otherwise pass through an upstream hydrodynamic separator or silt trap.
Large treatment capacity from small land take.
Minimises costs of materials, on-site machinery and equipment, and labour resource.
High surface area of each component material.
Allows greater contact time to improve the overall treatment efficiency.
High percolation rate combined with large surface area.
Limits surcharging even in extreme environments.
Loose granular material available in large one cubic metre bags.
Provides cost effective design flexibility.
Estimated 25-year minimum performance lifespan
Extended material durability provides long lasting service.
Tested at an independent facility under the observation of a UKAS-accredited laboratory chemist.
Product’s performance capacity has been independently verified.
For use in linear developments as a 250mm deep layer beneath standard aggregate.
Increases treatment capacity and reduces downstream flood risk.
How Does It Work?
The graphic [above] shows a typical application on a linear development, such as a road scheme, where a 250mm layer of SDS Aqua-Xchange™ is introduced into a filter drain, beneath a layer of standard aggregate. The use of a linear filter drain allows a flexible design system, removing the need for large areas of additional land take. The linear design also offers a huge treatment capacity which can be more than eight times greater than in an end-of-pipe treatment device.
Solids suspended in the runoff are filtered and collected in the aggregate, while soluble pollutants are captured by the layer of SDS Aqua-Xchange™ beneath. By introducing SDS GEOlight® tanks beneath the Aqua-Xchange™, the drain can also provide attenuation capacity and reduce downstream flood risk.
The two graphics [above and below] show SDS Aqua-Xchange™ in urban and highway applications.
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Get in touch with us
Address
SDS Limited,
Clearwater House, Castlemills,
Biddisham, Somerset,
BS26 2RE,
United Kingdom
Clearwater House, Castlemills,
Biddisham, Somerset,
BS26 2RE,
United Kingdom