- Y Diweddaraf sydd Ar Gael (Diwygiedig)
- Gwreiddiol (a wnaed Fel)
There are currently no known outstanding effects for the The Urban Waste Water Treatment (England and Wales) Regulations 1994, PART I.
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1. Treatment plants shall be designed or modified so that representative samples of the incoming waste water and of treated effluent can be obtained before discharge to receiving waters.E+W
2. Discharges from urban waste water treatment plants subject to treatment in accordance with regulation 5(1) and (2) shall, subject to paragraphs 4 and 5 of Part II of this Schedule, meet the requirements shown in Table 1 below.E+W
3. Discharges from urban waste water treatment plants to those sensitive areas which are subject to eutrophication as identified in sub-paragraph (a) of Part I of Schedule 1 shall, subject to paragraphs 4 and 5 of Part II of this Schedule, also meet the requirements in Table 2 below.E+W
4. More stringent requirements than those shown in Table 1 and/or Table 2 shall be applied where required to ensure that the receiving waters satisfy [F1retained EU law].E+W
Textual Amendments
F1Words in Sch. 3 Pt. 1 para. 4 substituted (31.12.2020) by The Floods and Water (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/558), regs. 1(1), 7(6); 2020 c. 1, Sch. 5 para. 1(1)
5. The points of discharge of urban waste water shall be chosen, as far as possible, so as to minimise the effects on receiving waters.E+W
The values for concentration or for the percentage of reduction shall apply.
{s001} Reduction in relation to the load of the influent. {s002} The parameter can be replaced by another parameter: total organic carbon (TOC) or total oxygen demand (TOD) if a relationship can be established between BOD5 and the substitute parameter. | |||
Parameters | Concentration | Minimum percentage of reduction {s001} | Reference method of measurement |
---|---|---|---|
Biochemical oxygen demand (BOD5 at 20°C without nitrification {s002} | 25 mg/l O2 | 70—90 | Homogenized, unfiltered, undecanted sample. Determination of dissolved oxygen before and after five-day incubation at 20°+1°C, in complete darkness. Addition of a nitrification inhibitor |
Chemical oxygen demand (COD) | 125 mg/l O2 | 75 | Homogenized, unfiltered, undecanted sample Potassium dichromate |
Analyses concerning discharges from lagooning shall be carried out on filtered samples; however, the concentration of total suspended solids in unfiltered water samples shall not exceed 150 mg/l.
One or both parameters may be applied depending on the local situation. The values for concentration or for the percentage of reduction shall apply.
{s003} Reduction in relation to the load of the influent. {s004} Total nitrogen means: the sum of total Kjeldahl-nitrogen (organic N + NH3), nitrate (NO3)-nitrogen and nitrite (NO2)-nitrogen. | |||
Parameters | Concentration | Minimum percentage of reduction {s003} | Reference method of measurement |
---|---|---|---|
Total phosphorus | 2 mg/l P (10,000—100,000 p.e.) 1 mg/l P (more than 100,000 p.e.) | 80 | Molecular absorption spectrophotometry |
Total nitrogen {s004} | 15 mg/l N (10,000—100,000 p.e.) 10 mg/l N (more than 100,000 p.e.) | 70—80 | Molecular absorption spectrophotometry |
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