NF EN ISO 11733

NF EN ISO 11733

December 2004
Standard Current

Water quality - Determination of the elimination and biodegradability of organic compounds in an aqueous medium - Activated sludge simulation test

ISO 11733:2004 specifies a method for the determination of the elimination and the biodegradability of organic compounds by aerobic micro-organisms. The conditions described simulate a wastewater treatment plant. Two test systems can be used: activated sludge plants or porous pots. The tests can optionally be performed under conditions of nitrification and denitrification and coupling of the units. The method applies to organic compounds which, under the conditions of the test, are soluble in tap water at the test concentration and not expected to be transformed to insoluble metabolites if biodegradation, in addition to elimination, is determined;poorly water-soluble, but which are satisfactorily dispersible in water and allow detection with suitable analytical means (e.g. organic carbon measurements);non-volatile, or which have a negligible vapour pressure under the test conditions;not inhibitory to the test micro-organisms at the concentration chosen for the test. Compounds inhibitory at concentrations used in this test may be tested at concentrations less than their EC20 value, followed by higher practical concentrations after a period of acclimatization. The method can also be used to measure the biodegradation and elimination of dissolved organic compounds in waste water (also called "test compound" in the method).

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Main informations

Collections

National standards and national normative documents

Publication date

December 2004

Number of pages

39 p.

Reference

NF EN ISO 11733

ICS Codes

13.020.40   Pollution, pollution control and conservation
13.060.70   Examination of biological properties of water

Classification index

T90-323

Print number

1 - 21/12/2004

International kinship

ISO 11733:2004

European kinship

EN ISO 11733:2004
Sumary
Water quality - Determination of the elimination and biodegradability of organic compounds in an aqueous medium - Activated sludge simulation test

ISO 11733:2004 specifies a method for the determination of the elimination and the biodegradability of organic compounds by aerobic micro-organisms. The conditions described simulate a wastewater treatment plant. Two test systems can be used: activated sludge plants or porous pots. The tests can optionally be performed under conditions of nitrification and denitrification and coupling of the units.

The method applies to organic compounds which, under the conditions of the test, are

  1. soluble in tap water at the test concentration and not expected to be transformed to insoluble metabolites if biodegradation, in addition to elimination, is determined;
  2. poorly water-soluble, but which are satisfactorily dispersible in water and allow detection with suitable analytical means (e.g. organic carbon measurements);
  3. non-volatile, or which have a negligible vapour pressure under the test conditions;
  4. not inhibitory to the test micro-organisms at the concentration chosen for the test. Compounds inhibitory at concentrations used in this test may be tested at concentrations less than their EC20 value, followed by higher practical concentrations after a period of acclimatization.

The method can also be used to measure the biodegradation and elimination of dissolved organic compounds in waste water (also called "test compound" in the method).

Replaced standards (1)
NF EN ISO 11733
November 1998
Standard Cancelled
Water quality. Evaluation of the elimination and biodegradability of organic compounds in an aqueous medium. Activated sludge simulation test.

Table of contents
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  • Avant-propos
    iv
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    2
  • 4 Principe
    3
  • 5 Environnement d'essai
    4
  • 6 Réactifs
    4
  • 7 Appareillage
    7
  • 8 Mode opératoire
    8
  • 8.1 Généralités
    8
  • 8.2 Préparation de l'inoculum
    9
  • 8.3 Réalisation de l'essai
    9
  • 9 Calcul et expression des résultats
    12
  • 9.1 Calcul du taux d'élimination
    12
  • 9.2 Expression des résultats
    13
  • 9.3 Indication de la biodégradation
    13
  • 9.4 Biodégradation du milieu organique
    13
  • 10 Validité de l'essai
    13
  • 11 Rapport d'essai
    14
  • Annexe A (informative) Modification de l'essai de simulation des boues activées pour les unités de traitement des eaux résiduaires par nitrification-dénitrification
    15
  • Annexe B (informative) Couplage des unités d'essai (facultatif)
    19
  • Annexe C (informative) Systèmes d'essai
    20
  • Annexe D (informative) Effets du temps de rétention des boues sur la concentration de l'effluent
    23
  • Annexe E (informative) Exemple d'une courbe d'élimination/dégradation
    27
  • Bibliographie
    28
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