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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.
| Parameters | Concentration | Minimum 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 phosphorus | 2 mg/1 P (10,000–100,000 p.e.) 1mg/1 P (more than 100,000 p.e.) | 80 | Molecular 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.) | 70-80 | Molecular absorption spectrophotometry |
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