urban-waste-water-treatment

Urban Waste Water Treatment Directive, Annex I: Discharge requirements

This list contains requirements for (1) discharges from urban waste water treatment plants (Annex I, Table 1), and (2) discharges to sensitive areas (Annex I, Table 2), under Directive 91/271/EEC.

Biochemical oxygen demand

EC / List no: - CAS no: -
Concentration
25 mg/l
Expressed As
As O2
Method
Homogenized, unfiltered, undecanted sample. Determination of dissolved oxygen before and after five-day incubation at 20 °C ± 1 °C, in complete darkness. Addition of a nitrification inhibitor
Minimum reduction
70.0 %

90.0 %

Table
1
Parameters
(BOD5 at 20 °C) without nitrification
Notes
1 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.

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