ABSTRACT
Several authors have examined the problems associated with sewage disposal when it contains both pathogens and parasites capable of infecting man and his domestic animals. In a recent review it was pointed out that in the U.K. alone 1.25 million tonnes of sludge dry solids are produced annually. Approximately half is disposed of on land and some 187,500 tonnes of this onto grazing land. (1) Disposal on land, apart from being one of the cheapest methods of disposal is valuable to farmers as fertiliser due to the contained nitrogen and phosphates in the sludge.
