Europes Largest Potable Water Brine Electrochlorination Plant Selects Severn Trent Services ClorTec® System for Its Disinfection Needs

The ClorTec on-site hypochlorite generating system removes the risk of liquid chlorine bulk storage.

TAMWORTH, U.K. –Severn Trent Services, a leading global supplier of water and wastewater solutions, has supplied its ClorTec® on-site hypochlorite generating system for the largest potable water brine electrochlorination plant in Europe to address the need to reduce risk from bulk storage of liquid chlorine, as part of a £35 million upgrade. The improvements at Huntington Water Treatment Works in Chester, England, are part of a £3.6 billion investment by United Utilities across North West England.

The original project scope called for the construction of a new facility to store drums of liquid chlorine on site. However, the project team identified an alternative process that would eliminate the need to store hazardous liquid chlorine, reducing the risk to operators, and demonstrate best practices in Health Safety.

Severn Trent Services installed six ClorTec HCT-1500 units, which each have a production capability of up to 680 kg/day of chlorine equivalent. Overall the units have the potential to produce 4,080 kg/day of chlorine equivalent and so are able to produce the 3,360 kg maximum chlorine demand at Huntington in an operating period of 20 hours.

Generating sodium hypochlorite on-site is a simple and straightforward process. The ClorTec system operates by feeding a mix of softened water and brine at a three percent solution through electrolytic cells. A low-voltage DC current is applied and a 0.8 percent sodium hypochlorite solution is produced.

United Utilities area business manager Alex Bolton said, “The ClorTec system allows us to replace bulk chlorine with a much safer alternative for our employees.”

In 2013 Severn Trent Services was recognised as a pioneer of stable, safe and sustainable electrochlorination technology when it received the Global Water Wastewater Disinfection Systems Technology Leadership Award from Frost Sullivan.

In addition to the six units installed at Huntington, Severn Trent Services has also supplied ClorTec units to other United Utilities sites. These include Sutton Hall and Oswestry water treatment works with a combined daily water treatment capacity of 2,312 kg.

About Severn Trent Services Water Purification

Severn Trent Services ( with global headquarters in Horsham, Pa., USA, is a leading supplier of water and wastewater solutions. The company’s Water Purification business, based in Colmar, Pa., USA, provides innovative disinfection, instrumentation and filtration technologies for the municipal, energy and marine markets. Our water treatment technologies are backed by a global support network of experienced customer service representatives, application engineers and field service technicians. Severn Trent Services is a member of the Severn Trent Plc (London: SVT.L) group of companies. Severn Trent is a FTSE 100 company.


Fran House

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