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The Urban Waste Water Treatment (Scotland) Regulations 1994

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TABLE 2REQUIREMENTS FOR DISCHARGES FROM URBAN WASTE WATER TREATMENT PLANTS TO SENSITIVE AREAS WHICH ARE SUBJECT TO EUTROPHICATION AS IDENTIFIED IN SUB-PARAGRAPH (a) OF PART I OF SCHEDULE 1

One or both parameters may be applied depending on the local situation.The values for concentration or for the percentage of reduction shall apply.

ParametersConcentrationMinimum percentage of reduction(1)Reference method of measurement
(1)

Reduction in relation to the load of the influent.

(2)

Total nitrogen means: the sum of total Kjeldahl-nitrogen (organic N+NH3), nitrate (NO3)-nitrogen and nitrite (NO2)-nitrogen.

Total phosphorus2 mg/1 P (10,000–100,000 p.e.) 1mg/1 P (more than 100,000 p.e.)80Molecular absorption spectrophotometry
Total nitrogen(2)15 mg/1 N (10,000–100,000 p.e.) 10 mg/1 N (more than 100,000 p.e.)70-80Molecular absorption spectrophotometry

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