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30 water treatment works released 11bn litres of raw sewage in a year, study suggests.Exclusive: Researchers analysed works run by nine water and sewerage companies in England and Wales Sandra Laville Environment correspondent Sat 27 May 2023 20.22 AEST Eleven
billion litres of raw sewage were discharged from a sample of 30 water
company treatment works in one year, new research suggests.The
study aimed to reveal the volume of discharged effluent released from
storm overflows by water firms. Companies are not forced to reveal the
volume of raw sewage released during discharges... In a study of 30 treatment works in 2020 run by nine of the 10 water and sewerage companies in England and Wales, the volume of raw sewage discharged was estimated at 11bn litres – or the equivalent volume to 4,352 Olympic pools...Measuring
the volume of discharges was vital to establish the environmental
impact of them upon rivers, he said. “Individual rivers receive direct,
simultaneous discharges of untreated sewage from multiple storm
overflows on their journey from source to sea,” Prof. Hammond said. “So,
during longer spills, the lower reaches of a river may already be
polluted from upstream discharges when yet more overflows downstream
discharge untreated sewage.”The
River Nidd in North Yorkshire, one of the river catchments studied by
Hammond, receives untreated sewage discharges from at least seven
treatment works. ”Data from
treatment works run by Welsh Water that feed into the Conwy, a sea trout
river in north Wales, was also studied. Hammond estimated the volume of
discharges from both inlets and storm tank overflows was an equivalent
to 34 Olympic swimming pools...The water industry has promised to triple investment in the sewerage network to £10bn
this decade as it apologised for not acting on sewage pollution.
Clayden said his group was waiting to hear details from Yorkshire Water
about what that meant for cleaning up the Nidd. A
Yorkshire Water spokesperson said: “... The assessments suggests that where Yorkshire Water can make a
difference is in reducing phosphorus from final effluent of wastewater.
That is why we are investing £790m by 2025 in phosphorus removal.”
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