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Horsley Water Treatment Works Upgrade

A £46M project to upgrade Horsley WTW has now reached a key milestone. We have selected our partners, a joint venture partnership with Doosan Enpure and Interserve Construction, to upgrade the treatment works.

Start Date

March, 2016

Estimated End Date

August, 2019


NW, MWH, Interserve Construction

Update by Geoff Joyce

Hi everyone,

Work continued apace again this week with good progress being made. At the extreme north-east corner of the site work commenced on the installation of the base slab of the MCC (Motor Control Centre). This part of the construction will contain the equipment which will power and control the treatment of water through the Actiflo process (chemical injections, clarification of raw water and removal of suspended solids). Photo attached.

At the south end of the site the north-west base slab to the Rapid Gravity Filters was extended, with concrete placed today, Friday. (Photo attached)

Mechanical installation commenced in earnest with constuction of scraper blades/ drive motors and baffle plates. Photos attached.

Work continued to underground pipe installation to the inlets to the Actiflo building and continued with excavation for a flowmeter chamber, which will house equipment capable of measuring flows into the Works.

A flight over the site was undertaken by a drone on Wednesday to record progress.

Some members of staff are to attend a talk by a couple at The Hearth Centre in Horsley Village next Thursday (18 May) evening. The talk is on locally-born Landscape Architect Capability Brown. We hope to meet any local NWL customers who might have any queries regarding the WTW Upgrade scheme.

Have an enjoyable weekend.




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