Sutton Hall WTW - Actiflo for Crytpo and Mn removal


Courtesy of

United Utilities
Maximum flow 127 000 m3/day

The Client
United Utilities are the 2nd largest water company in England and Wales, responsible for an area in the north west of the UK including major cities such as Manchester and Liverpool.

The Client's Needs
Sutton Hall is one of the largest treatment works operated by UU and is located near Chester on the Wirral peninsula; the site supplies over 300,000 people in the greater Liverpool / Birkenhead area

The purpose of the project was to prevent Cryptosporidium, reduce the levels of manganese in the final water and improve the disinfection system by reducing TOC content, whilst maintaining the ability of the plant to remove occasional pesticides.

VWS Solution
United Utilities awarded the construction contract to Galliford-Costain JV to deliver a complete plant overhaul including GAC filtration and Manganese removal using pH adjustment and Cl2 followed by secondary filtration. The ActifloTM was selected for Cryptosporidium and Manganese removal.

Veolia Water Solutions & Technologies provided the process design, construction, installation, testing and commissioning of 3 ActifloTM High Rate Clarifiers, including sand storage, make up, transfer and recovery system, polymer make up and dosing system, MCC and software for the above systems.

The Sutton Hall project achieved 250,000 man hours without a lost time accident.

ActifloTM is a very compact process that utilises microsand as a seed for floc formation. The microsand provides surface area that enhances flocculation and also acts as a ballast or weight.

The resulting microsand ballasted floc display unique settling characteristics, which allow for clarifier designs with high overflow rates and short retention times. These designs result in system footprints that are between 5 times smaller than classic lamella clarifier or dissolved air flottation and up to 20 times smaller than conventional clarification systems of similar capacity, with an ability to start up from a 'standby' mode of operation to a steady state operating mode within minutes.

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