NRA reaches interim verdict on sewage disinfection

The National Rivers Authority (NRA) has come down against the use of ozone and peroxyacetic acid (PAA) for sewage disinfection. The decision is a blow to companies which were hoping to capitalise on demand for interim clean-up of coastal sewage discharges in response to growing public concern about pollution of bathing waters.

The water companies have shown considerable interest in disinfection as one way to achieve compliance with the EC Directive on bathing water quality while improvements to sewage works are under way.

A report for the Department of the Environment (DoE) two years ago cast doubt on the efficacy and by-products produced by most disinfection systems (ENDS Report 178, pp 6-7). The House of Commons Environment Committee also urged that moves to

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