The latest example of BIODEGMA® IVC design combined with GORETM Cover membrane technology being used for Animal-by Product Regulation (ABPR) approved in-vessel composting is the London Waste Composting Centre in London’s Edmonton EcoPark which was approved in 2005. This is where 30,000 tpa of kitchen, green and organic waste originating from seven London districts is treated in 16 BIODEGMA® IVC composting modules.
'Hygienic safety“ is a critical criteria when evaluating the quality of compost. According to the requirements of EU law, particularly when food waste is being treated, waste treatment processes must be able to prove that they are epidemically and phytohygienically safe and provide proof of their hygienic efficacy: for the composting process this means that the plant microbes, but also the pathogens that might well be present in the composting material, must be reliably destroyed by the heat generated during the treatment process. In addition to this, composting plants must be designed in such a way that a recontamination of the hygienised material is impossible. This is usually achieved by encapsulating the process (in-vessel composting = IVC) and ensuring that all leachate is reliably collected. The implementation of the European Animal By Product Directive (ABPR, 1774/2002/EC) in the UK sets the strictest standards in Europe as a reaction to BSE and foot-and-mouth disease.
In order to comply with the strict ABPR requirements, the London Waste Composting Centre modules are always loaded from one side and emptied from the other, making sure that different front-end loaders are used for each of these tasks. This set-up accomplishes a 'two-barrier-system“, thus avoiding the danger of a recontamination of the hygienised material. In the composting module the oxygen supply of the composting material takes place by means of controlled pressurised aeration via aeration channels in the floor, the CO2 and water vapour discharge on the other hand takes place via the semi-permeable GORETM Cover laminate is integrated into the wing-like fold-back roof and the gates of the composting module. The function of the semi-permeable membrane – which is based on the same technology used for making the well known GORE-TEX® garments - ensures that the emissions from the composting boxes are minimised while at the same time creating and maintaining the perfect environment for organic waste treatment inside the composting boxes. This is where the biowaste is encapsulated for a period of 3 weeks to undergo the intensive composting process. Afterwards it undergoes a 3 week post-composting process which means that hygienisation requirements are doubly complied with.
The compost then matures for another 4-6 weeks in an un-aerated maturation windrows before being sold as high-quality compost.
This plant provides proof of the fact that apart from being able to process large quantities of waste in a small area efficiently and with low emissions, the BIODEGMA® IVC design using GORETM Cover technology offers you a cost-efficient way of complying with national regulations derived from EU ABPR.
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