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Pathogens in Biosolids - Microbiological Risk Assessment
Price: £200
Ref: 03/SL/06/7
ISBN: 1-84057-294-9
Published: 2003
Biosolids represent the solid fraction of sewage and potentially contain a number of human and animal pathogens. This report describes a microbiological risk assessment to quantify the risks to humans from consumption of root crops grown on land to which treated biosolids have been applied in accordance with the Safe Sludge Matrix and the Regulations. The seven pathogens studied were Escherichia coli O157, Cryptosporidium, Giardia, Salmonella, Campylobacter, Listeria monocytogenes and enteroviruses. A number of worst-case assumptions have been made to accommodate lack of data. The predicted risks to the UK population as a whole are remote. Indeed, the highest risk is for Cryptosporidium with one infection in the UK population every 45 years on average. The model shows that the 12 month harvest interval compensates for any increased risks due to inefficient operation of sludge treatment at the works.
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