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Category 3 material includes:
- Abattoir by-products such as soft offal, blood and feathers.
- Food factory waste.
- Food waste from retail outlets, in particular supermarkets.
- Catering waste, including kitchen waste from domestic households and commercial kitchen waste.
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Category 2 material which has been pressure-cooked.
Category 3 material may be incinerated, rendered or transformed in a composting or biogas plant; only catering waste and retail outlet waste may be landfilled, although the latter is due to be banned in the near future. The issue is further complicated in that if a composting or biogas plant transforms only catering waste, then the treatment standard may be set by member states. A biogas plant is likely to treat a combination of materials and is therefore subject to the strict standards set down by the EU, namely:
- The process must be in-vessel; controlled anaerobic digestion is by definition in-vessel.
- The maximum particle size of material is 12 mm.
- All material must be pasteurised at a minimum temperature of 70°C for one hour.
- Procedures must be adopted to prevent recontamination of the final product with raw waste.
- Samples of the final product must be free of Salmonella.
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Permitting
Greenfinch
Limited, The Business Park, Coder Road, Ludlow, Shropshire, SY8
1XE • Tel:
01584 877 687 Fax: 01584 878 131 • Email:
biogas@greenfinch.co.uk