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Anaerobic Digestion of farm and food processing residues GoodPractice Guidelines Page52 Appendix7 Effects of AD on parasites and The following paragraphs outline the effects of the anearobic digestion (AD) process on different pathogens. Parasites Anaerobic digestion at 350C (known as mesophilic digestion, used by the vast majority of farm digesters), has been shown to reduce the numbers of viable larvae and eggs of some parasitic worms to undetectable levels after one week, although there is generally poor control of Ascaris, Tacnia and Cryptosporidium. However, the oocysts (a type of egg) of these worms, which can infect any animal ingesting them, remain viable after 50 days at 350C. Digestion at 550C significantly reduces the numbers of oocysts, but many viable units still persist, even after digestion for extended periods of time. Mesophilic anaerobic digestion will not significantly reduce the infectivity of slurry contaminated with parasites. Pathogenic bacteria Experiments with pig slurry have shown that mesophilic digestion for four days will destroy 90% of a population of Salmonella bacteria, although low levels of the bacteria persisted even after 70 days digestion. This persistence may be due to poor mixing within the digester, allowing pockets of bacteria to survive in a crust on the surface. Properly managed, thermophilic digestion can reduce bacterial levels by an even greater factor, but again low levels may persist due to poor mixing. Mesophilic anaerobic digestion will significantly reduce the levels of pathogenic bacteria, but will not eliminate them completely from the waste and so the COSHH assessment will determine the measures required to control the potential damage to human health. Viruses Research findings have shown that mesophilic anaerobic digestion reduces virus numbers in sewage samples, but viable virus units may still be found to be present, even after extended periods of digestion. pathogensPDF Image | Anaerobic Digestion Of farm and food Processing residues The development of a sustainable industry
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