ISO 20200 pdf download – Plastics – Determination of the degree of disintegration of plastic materials under simulated composting conditions in a laboratory-scale test

ISO 20200 pdf download – Plastics – Determination of the degree of disintegration of plastic materials under simulated composting conditions in a laboratory-scale test.
3.8
total dry solids
amount of solids obtained by taking a known volume of test material or compost and drying at about 105 C to constant mass
3.9
volatile solids
amount of solids obtained by subtracting the residue obtained from a known volume of test material or compost after incineration at about 550 C from the total dry solids content of the same sample
NOTE The volatile-solids content w an Widication of the amount ol organic mailer present
4 Principle
The method determmes the degree of disintegration of test materials on a laboratory scale under conditions srnulating an intensive aerobic composfing process The solid matrix used consists of a synthetic solid waste inoculated with mature compost taken from a commercial caompostrlg plant Pieces of the plastic test material are composted with this prepared solid matrix. The degree of disintegration is determined after a composting cyde, by sieving the final matrix through a 2 mm sieve in order to recover the non-disintegrated residues. The reduction in mass of the test sample is considered as disintegrated niatenal and used to calculate the degree of disintegration.
5 Synthetic solid waste
The composition of the synthetic waste used in this method Is descflbed m Table 1.
Well aerated compost from a commercial aerobic cornposting plant shall be used as the noculum. The compost inoctium shall be homogeneous and free from large inert objects such as glass, stones or pieces of metal. Remove any such obØcls manually and then sieve the compost on a screen of mesh aperture between 0.5 cm and 1 cm. It Is recommended that compost from a plant composting the organic fraction of solid municipal waste be used in order to ensure sufficient diversity of microorganisms. If such a compost is not available, then compost from plants treating farmyard waste or mixtures of garden waste and solid municipal waste may be used. The compost shall not be older than 4 months,
Prepare the synthetic waste manually by mixing the different components tisted In Table 1 The allowed tolerance on the mass measurements of the synthetic waste components, water included, is 5%. Add chloflne-free tap water, or de-ionized or distilled water, to the mixture to adust its final water content to 55 % Ni total. Perform this operation just before start-up. The synthetic waste shall have a carbon:nitrogen (C/N) ratio of between 20:1 and 40:1. The urea concentration can be changed to adjust the C/N ratio to the required range. In this case, the concentration of the other components shall be adjusted proportionately in order to brwig the total dry mass of the Solid waste to 100%.