NF EN ISO 9509

NF EN ISO 9509

September 2006
Standard Current

Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms

ISO 9509:2006 specifies a method for assessing the short-term inhibitory effect of waters, waste waters or test substances on nitrifying bacteria in activated sludge. The inhibitory effect is estimated over an exposure period of usually 3 h or up to 24 h with weakly nitrifying sludge. The method is applicable to nitrifying activated sludge derived from domestic and synthetic sewage and also to sludges from industrial and mixed domestic and industrial waste waters. The nitrifying activity of the sludge is verified by testing in the presence and absence of a specific inhibitor. If the nitrification rate is within a suitable range for the test, i.e. 2 mg of nitrogen per gram of suspended solid and hour to 6,5 mg of nitrogen per gram of suspended solids and hour, the sludge may be used directly. If not, adjustments are necessary. The method is applicable to water-soluble, non-volatile chemicals, and to waste waters

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Main informations

Collections

National standards and national normative documents

Publication date

September 2006

Number of pages

23 p.

Reference

NF EN ISO 9509

ICS Codes

13.020.40   Pollution, pollution control and conservation
13.030.20   Liquid wastes. Sludge
13.060.70   Examination of biological properties of water

Classification index

T90-341

Print number

1 - 08/09/2006

International kinship

ISO 9509:2006

European kinship

EN ISO 9509:2006
Sumary
Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms

ISO 9509:2006 specifies a method for assessing the short-term inhibitory effect of waters, waste waters or test substances on nitrifying bacteria in activated sludge. The inhibitory effect is estimated over an exposure period of usually 3 h or up to 24 h with weakly nitrifying sludge.

The method is applicable to nitrifying activated sludge derived from domestic and synthetic sewage and also to sludges from industrial and mixed domestic and industrial waste waters.

The nitrifying activity of the sludge is verified by testing in the presence and absence of a specific inhibitor. If the nitrification rate is within a suitable range for the test, i.e. 2 mg of nitrogen per gram of suspended solid and hour to 6,5 mg of nitrogen per gram of suspended solids and hour, the sludge may be used directly. If not, adjustments are necessary.

The method is applicable to water-soluble, non-volatile chemicals, and to waste waters

Replaced standards (1)
NF EN ISO 9509
April 1995
Standard Cancelled
Water quality. Method for assessing the inhibition of nitrification of activated sludge micro-organisms by chemicals and waste water.

Table of contents
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  • Avant-propos
    iv
  • Introduction
    v
  • 1 Domaine d'application
    1
  • 2 Références normatives
    2
  • 3 Termes et définitions
    2
  • 4 Principe
    3
  • 5 Réactifs et matériaux
    3
  • 6 Appareillage
    4
  • 7 Mode opératoire
    5
  • 8 Calcul et expression des résultats
    6
  • 9 Validité des résultats
    6
  • 10 Fidélité
    7
  • 11 Rapport d'essai
    8
  • Annexe A (normative) Détermination de l'activité nitrifiante d'une boue activée
    9
  • Annexe B (normative) Exemple pour la préparation de l'essai
    10
  • Annexe C (informative) Appareillage pour la culture d'une boue activée nitrifiante
    11
  • Bibliographie
    13
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