Abstract
Sewage sludge is a cheap source of some nutrients for the soil but odour production, sometimes the presence of heavy metals and the possibility of sludge acting as a vehicle for persistent zoonotic pathogens have to be considered. Taenia saginata appears to be the most important parasite in temperate climates where sludge is used on grassland. Because there are so many possible routes of transmission it is not possible to quantify the role of sludge in the epidemiology of this parasite. Sludge may be disinfected before use by procedures involving heat or irradiation. Otherwise it is necessary to allow an interval of from 6 weeks to 6 months between application and allowing cattle to graze. Further research is required to establish the exact length of the interval required and also on least-cost disinfection procedures for sludge with regard to this parasite.
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