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Phil Metcalfe-Principal Consultant, ADAS

- Phil Metcalfe-Principal Consultant, ADAS's presentations
  - 2017 Presentations
Phil Metcalfe is a chartered environmentalist (CEnv) and chartered engineer (CEng) with over 42 years of experience in agri-environmental management consultancy and research, providing engineering solutions and strategic planning on a diverse range of disciplines. Phil delivers waste management policy advice for Governments including environmental impact assessment, socio-economic review, recommendations and development of improved environmentally friendly farming practices, processing, recycling to land of waste derived organic products and energy & carbon management.

Presentation Title:

Identification and prioritisation of risks to food safety and quality associated with the use of recycled waste-derived materials in agriculture and other aspects of food production

Presentation Synopsis:

Part II Semi-quantitative risk to food assessment of recycling three waste types.

A qualitative priority ranking produced a relative ranking of the source term/recycling mode combinations. This qualitative approach relied on expert judgements of the attenuation of aggregated hazards through various pathways to the points of exposure. The second part of this project looked it more detailed method of quantifying the risks to food from the higher ranked materials and uses.

The semi-quantitative approach was designed to disaggregate the component parts of the qualitative assessment for a selected number of examples, in a higher degree of detail than was practical for the full ranked list in the qualitative assessment. The approach was designed to make the process by which the combined risk score for a source term/recycling mode combination was generated more transparent. It therefore served as a means of validating and providing confidence in the risk ranking, and could be applied to a wider range of waste materials and recycling modes in future work.

The scenarios selected included three different recycling modes (i.e. application to agricultural land, use as livestock bedding, and inclusion in livestock feed) specifically:
- Blood and intestinal contents applied to agricultural land growing RTE crops (UK)
- Former foods used as feed for animals used in meat production(UK)
- Recycled manure solids used as bedding for dairy cattle producing milk (Sub-divided into ‘UK’ and ‘non-EU’)
Scoring for the source term used a 1-10 scale to characterise each material in terms of the potentially hazardous agents present at the point of recycling; the score encompasses the concentration of the potentially hazardous agent, its potency and the seriousness of the consequences of ingestion.