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Wednesday, 15 June 2011 04:43

Black & Veatch provide details for £16 million Llwyn Onn rebuild contract

Black & Veatch have provided further details about the  £16 million Llwyn Onn rebuild contract.

The major refurbishment of Dee Valley Water’s largest water treatment works will provide long-term security and quality of water supplies to Wrexham and the surrounding area. Tendered as a single project, Black & Veatch has been appointed as design and build partner to upgrade and replace the ageing water treatment assets at Llwyn Onn water treatment works.

Black & Veatch Bid Manager Mat Fairfax said:

“Our fully integrated design and construction delivery model was a key differentiator in our being awarded this important project.

“A prominent consideration in our design will be to minimise operational cost and energy consumption which is of critical importance. Additionally, we are committed to minimise the works’ environmental impact through waste-efficient design and construction execution that fulfils carbon reduction and waste-to-landfill objectives.”

The rebuilt works will be constructed within the constraints of the existing site and the new structures will be designed and built off-line whilst the existing treatment facility remains in operation. As well as improving water security, the introduction of a secondary treatment process will further ensure customers continue to benefit from the highest standards of water quality.

The £16 million upgrade forms the largest single project being delivered under Dee Valley Water’s five-year AMP5 Capital Investment Programme, which is mainly targeted at the renewal of assets that are approaching the end of their useful lives.

The contract will be executed in two phases. The six-month design period began in April 2011, and will be followed by an 18-month construction period. All works are planned to be complete by April 2013.

The appointment furthers Black & Veatch’s 20-year relationship with Dee Valley Water in supporting the water company’s need to meet environmental requirements and fulfil customer expectations with a secure and high-quality water service.

Llwyn Onn WTW is Dee Valley Water’s largest treatment works. The existing works has a capacity of 48 megalitres per day (Ml/d) and treats water from both river and upland sources.

The rebuilt works will comprise all of the treatment processes and ancillary works, from the raw water inlet pipe to a post-contact tank outlet pipe connection to the existing 18 megalitre storage reservoir. Some elements of the existing works will be retained and integrated into the new works.

The new works will include a second filtration stage for the removal of manganese to further ensure water quality.

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