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Improvement works to an existing 200MLD water treatment plant serving Liverpool from Lake Vyrnwy.

The works improve water quality by the removal of Total Organic Carbons (TOC), these being the precursor for THMs, a suspected cause of carcinogens. The construction comprised new dosing mixing, RGFs and wash water system for the entire 210 MLD flow to relieve the existing Slow Sand Filters. Additional benefits include iron reduction and colour reduction.

The works was constructed on a live site and thus liaison with operations was closely managed. The project was completed over 70 weeks and involved only one 8 hour shutdown and only one reportable H&S incident. The plant was commissioned by taking partial flow from the raw water with ramp up over the commissioning period.

    Location: Oswestry, Shropshire, United Kingdom
    Region: Europe-Africa
    Market Sector: Water & Wastewater
    Status: Complete

    Scope of Services:

    • New inlet works with micro flocculation and enhanced coagulation.
    • Chemical dosing and storage.
    • Rapid gravity filtration.
    • Backwash water recovery to lamella tanks with sludge treatment.
    • Sludge dewatering by filter pressing.
    • MCC panels, standby generation and PLC/SCADA control systems.

    Mechanical Equipment:

    • Channel/static mixers
    • Lamellas
    • WRc thickeners
    • Filter presses
    • Roots blowers
    • Submersible pumps


    • Lime make-up, storage and dosing
    • Polyelectrolyte make-up, storage and dosing
    • PolyDADMAC make-up storage and dosing
    • Hydrochloric acid make-up, storage and dosing
    • Aluminium sulphate make-up, storage and dosing

    Upgrade of 220mld WTW to provide microflocculation, RGF, Chemical dosing, washwater recovery, dewatering plant, refurbishment of ozone system.



    Our address

    Oswestry, Shropshire, United Kingdom
    52.857148, -3.056412000000023

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