NRA studies toxicity-based discharge consents

The National Rivers Authority (NRA) is to launch a pilot study next year into the use of toxicity-based consents for controlling complex chemical discharges. It plans to introduce the new consents from 1995 to control effluents from sewage works and the chemical, oil and paper industries.

Toxicity-based consents or direct toxicity assessment (DTA) have been used by the US Environment Protection Agency since the mid-1980s for consenting toxic effluents. In 1990, an NRA report on its future discharge consent policy proposed that DTA should be introduced in Britain for complex effluents where not all the constituents can be monitored and individually consented.

DTA involves testing effluents for toxicity on indicator aquatic

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