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A GBP17m programme to improve drinking water quality for 50,000 Welsh Water customers in the Swansea valley has included investment in Lamella plate separation technology from Hydro.

To process increased volumes of backwash water generated by the major upgrade to clarification and filtration facilities at Crai Water Treatment Works, a Hydro Lamella Plate Clarifier was chosen by construction and consulting company Black and Veatch.

‘With its small-footprint design, the Lamella plate settlement process provided a compact solution in a sensitive national park location in the Brecon Beacons,’ said Black and Veatch chief mechanical engineer Malcolm Bamsey.

A major upgrade to the Crai WTW was required to address the need for Manganese removal from the drinking water.

The additional clarification and filtration plant incorporates a new CoCoDAF process upstream of existing filters, new media in existing filters, and new chlorine and lime dosing points.

Dirty washwater from the new filtration plant is collected and fed at 14 litres/sec through the Hydro Lamella plate clarifiers.

The supernatant liquor is returned to the balancing tanks, while the separated solids are fed through existing sludge thickeners before being removed for agricultural use.

‘With the Hydro Lamella plant we will achieve a high quality of supernatant liquors and achieve the required volumetric throughput for the dirty washwater process to deal with the increased loading of the plant,’ said Chris Day, general manager of Hydro Wastewater.

‘The Hydro Lamella plates are a highly efficient way of maximising solids removal from the supernatant before subsequent sludge thickening and removal,’ Day said.

‘By providing 10m2 of settling area per 1m of ground area, Hydro Lamella Plate Clarifiers provide a footprint up to 90 per cent smaller than conventional settlement tanks,’ he continued.

‘By using Lamellas to process backwash water, the Crai WTW now has highly efficient fine solids removal, achieving a top quality clarification process with good operational reliability and low maintenance,’ Day added.

Hydro International

Hydro International is a market-leading provider of products and solutions to control the quantity and improve the quality of water with minimal maintenance.

Hydro’s business operations are based in the UK, US and Ireland and its products are also used across the globe. Hydro products have won international awards for outstanding contributions and technical innovation in the water industry.

Hydro Stormwater

Hydro International’s Stormwater Division delivers sustainable, efficient and cost-effective solutions for water management with minimal land-take. All Stormwater products have no moving parts, no power requirements, a small footprint and low maintenance requirements.

Hydro Wastewater

Hydro International’s Wastewater Division provides products and designs solutions for the effective treatment of effluent and potable water. It is also a trusted partner for spares, service and maintenance agreements to water asset managers.

Hydro’s treatment systems cover an extensive range of water and wastewater management solutions including grit removal, sludge scraper systems, primary and washwater clarification, aeration, sand filtration, sludge screening and transportation and Combined Sewer Overflows.

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