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BS EN ISO 14853:2017:2018 Edition

BS EN ISO 14853:2017:2018 Edition

$167.15

Plastics. Determination of the ultimate anaerobic biodegradation of plastic materials in an aqueous system. Method by measurement of biogas production

Published By Publication Date Number of Pages
BSI 2018 38
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This International Standard specifies a method for the determination of the ultimate anaerobic biodegradability of plastics by anaerobic microorganisms. The conditions described in this International Standard do not necessarily correspond to the optimum conditions for the maximum degree of biodegradation to occur. The test calls for exposure of the test material to sludge for a period of up to 90 d, which is longer than the normal sludge retention time (25 to 30 d) in anaerobic digesters, although digesters at industrial sites can have much longer retention times.

The method applies to the following materials:

  • natural and/or synthetic polymers, copolymers or mixtures thereof;

  • plastic materials which contain additives such as plasticizers, colorants or other compounds;

  • water-soluble polymers;

  • materials which, under the test conditions, do not inhibit the microorganisms present in the inoculum. Inhibitory effects can be determined using an inhibition control or by another appropriate method (see e.g. ISO 13641). If the test material is inhibitory to the inoculum, a lower test concentration, another inoculum or a pre-exposed inoculum can be used.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Principle
5 Reagents and materials
13 6 Apparatus
6.1 Laboratory equipment
14 6.2 Apparatus for use when biogas is measured by a manometric method
6.3 Apparatus for use when biogas is measured by a volumetric method
7 Procedure
7.1 General
7.2 Digested sludge
15 7.3 Preparation of the inoculum
7.4 Preparation of test suspensions and controls
16 7.5 Incubation and gas measurement
17 7.6 Test duration
7.7 Measurement of inorganic carbon
7.8 Specific analyses
8 Calculation and expression of results
8.1 Amount of carbon in headspace
18 8.2 Calculation of amount of carbon in headspace when manometric measurement method is used
19 8.3 Calculation of amount of carbon in headspace when volumetric measurement method is used
8.4 Amount of inorganic carbon in the liquid
8.5 Total amount of carbon converted to gas
20 8.6 Amount of carbon in test material
8.7 Calculation of percentage biodegradation
9 Validity of results
9.1 Maintenance of anaerobic conditions
9.2 Inhibition of degradation
9.3 Validity of the test
21 10 Test report
22 Annex A (informative) Example of apparatus for determining the amount of biogas produced by measuring the increase in gas pressure
23 Annex B (informative) Example of apparatus for determining volumetrically the amount of biogas produced
25 Annex C (informative) Example of a biodegradation curve
26 Annex D (informative) Examples of data sheets for anaerobic biodegradability tests
29 Annex E (informative) Table of water vapour pressures at various temperatures
30 Annex F (informative) Calculation of theoretical carbon dioxide (ThCO2) and theoretical methane (ThCH4) production
31 Annex G (informative) Example of determination of recovery rate
34 Annex H (informative) Example of a workflow scheme
36 Bibliography

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BS EN ISO 14853:2017
$167.15