Reference number
ISO 15522:1999
International Standard
ISO 15522:1999
Water quality — Determination of the inhibitory effect of water constituents on the growth of activated sludge microorganisms
Edition 1
1999-06
Read sample
ISO 15522:1999
27554
Published (Edition 1, 1999)
This publication was last reviewed and confirmed in 2020. Therefore this version remains current.

ISO 15522:1999

ISO 15522:1999
27554
Language
Format
CHF 63
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Abstract

This International Standard specifies a method for assessing the potential toxicity of a test material to the growth of

aerobic bacteria present in activated sludge. The inhibitory effect is restricted to those microorganisms capable of

growth on the chosen organic test medium.

This method gives information on inhibitory effects on the microorganisms over incubation periods up to 6 h.

This method is applicable to water, wastewater and chemical substances which are soluble under the conditions of

the test. Special care is needed with volatile or coloured materials and materials which form turbid suspensions or

dispersions.

NOTE 1 Results with volatile test material should be interpreted with caution and are likely to underestimate any inhibitory

effect because of the difficulties in maintaining the initial concentration in the test flasks.

NOTE 2 Coloured materials and materials of low water-solubility which form turbid suspensions or dispersions can be tested

in many cases using colour/turbidity controls as blanks (see 9.4).

NOTE 3 Inhibitory effects on activated sludge microorganisms of test materials for which this test is not applicable can be

determined by using an inhibition test based on respirometric measurements (see ISO 8192).

General information

  •  : Published
     : 1999-06
    : International Standard confirmed [90.93]
  •  : 1
     : 12
  • ISO/TC 147/SC 5
    13.060.70 
  • RSS updates

Life cycle

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