urban-waste-water-treatment

Urban Waste Water Treatment Directive, Annex I: Discharge requirements

EU. Urban Waste Water Treatment: Annex I, Tables 1 & 2, Directive 91/271/EEC, last amended by Directive 2013/64/EU, 28 December 2013

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

90 %

70 %

Table

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.