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Yorkshire Water first in sector to eliminate Chlorine gas

Yorkshire Water is the first company in the water sector to eliminate all ageing chlorine and sulphur dioxide gas use from its water treatment works in a bid to remove any risk of toxic gas escapes.

The £14m project has taken two years to complete and involved replacement of dosing systems at 10 of its water treatment works.

Chlorine has been used in UK water treatment since the late 19th century, both to eliminate pathogens at the treatment works and as a residual disinfectant which can help maintain water quality through the distribution network. However, it is now being phased out on health and safety grounds to eradicate the risk of a worst-case scenario major toxic gas leak.

Yorkshire Water has replaced the gas disinfection system with a mix of sodium hypochlorite and sodium bisulphite chemical dosing systems, which contain only 15 per cent chlorine solution and poses significantly less risk.

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