Derwen construction commissions a new washing plant for aggregates


Courtesy of CDEnviro

Who’s involved?
Derwen Construction and the Wales Environment Trust.

Derwen Construction was established in 1993 as a civil engineering company, however three years ago, when they began to find it difficult to find landfill sites for the inert waste generated on their sites, they decided to become self sufficient and set up a recycling plant, which is based at Neath Abbey Wharf.

Derwen Construction originally recycled soils, green waste compost and general fills for the construction industry; however they have recently completed a GBP2.8 million venture to wash excavated inert waste to produce aggregates to various specifications.

With help from the Trust, they have been offered an AIG grant of GBP75,000; which they have accepted despite the difficult restrictions imposed.

The new plant which was commissioned in late December 2006 has the capacity to process 350,000 tonnes per annum of excavated waste from construction sites. The plant washes and screens the inert waste to produce fine and sharp sand, 5 - 10 mm aggregate and 10 – 20 mm aggregate. The oversize material which is 20 – 90 mm is either crushed to manufacture Granular Sub Base Type 1, or used in variety of other products, such as drainage materials.

The original recycling plant continues to recycle soils, green waste compost and general fills processed from construction and demolition waste. Both these plants now have the capacity to process up to 500,000 tonnes per annum from the site.

Derwen Construction is currently investigating some exciting new markets for their washed aggregates and the -63micron filter cake.

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