Plastics — Determination of the ultimate anaerobic biodegradation of plastic materials in controlled slurry digestion systems — Method by measurement of biogas production ((ISO 13975:2019))
This document specifies a method of evaluating the ultimate anaerobic biodegradability of plasticmaterials in a controlled anaerobic slurry digestion system with a solids concentration not exceeding15 %, which is often found for the treatment of sewage sludge, livestock faeces or garbage. The testmethod is designed to yield a percentage and rate of conversion of the organic carbon in the testmaterials to carbon dioxide and methane produced as biogas.The method applies to the following materials, provided they have a known carbon content:— natural and/or synthetic polymers, copolymers or mixtures;— plastic materials that contain additives such as plasticizers, colorants, or other compounds;— water-soluble polymers.It does not apply to materials which exhibit inhibitory effects on the test microorganisms at theconcentration chosen for the test.NOTE Inhibitory effects can be determined by an inhibition test (e.g. ISO 13641-1 or ISO 13641-2).
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