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    • Home
    • ICS
    • Environment. Health Protection. Safety
    • Water Quality
    • Examination Of Biological Properties Of Water
    • ISO 13641-1:2003

    Codes & Standards - Purchase

    ISO 13641-1:2003

    Water quality -- Determination of inhibition of gas production of anaerobic bacteria -- Part 1: General test
    SKU: iso_036232_117712 Published by ISO Publication Year 2003 1 Edition 14 pages

    Product Details

    • Overview
    ISO 13641-1:2003 specifies a screening method for assessing the potential toxicity of substances, mixtures, surface waters, groundwaters and wastewaters, effluents, sludges or other environmental samples by determining the production of biogas (carbon dioxide and methane) from the anaerobic digestion of sewage sludge over periods of up to 3 days. The growth rate of anaerobic bacteria is much lower compared with that of aerobic microorganisms. For this reason, the test periods are longer for anaerobic methods than those used for aerobic bacteria.

    This method is applicable to substances, soluble or insoluble in water, including volatile chemicals.

    Note that special care is necessary with compounds of low water-solubility, and in these cases, other methods might be more suitable.

    This method can provide information that is useful in predicting the likely effect of a test material on biogas production in anaerobic digesters. For example, only longer tests, which simulate working digesters more closely can indicate whether adaptation of the microorganisms to the test material can occur or whether compounds likely to be adsorbed onto sludge can build up to a toxic concentration over a longer period than allowed in this test.

    Information obtained by ISO 13641-1:2003 can also be helpful in choosing suitable initial mass concentrations for anaerobic biodegradability tests (e.g. ISO 11734). However, ISO 13641-1:2003 using undiluted sludge is less suitable for testing dilute digesting sludge than the method described in ISO 13641-2 where the mass concentrations are a hundredfold more dilute.

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