ABSTRACT
The option to be able to utilise sewage sludge on agricultural land is one which is beneficial to farmers and the water industry. However there is a requirement to ensure that humans, animals, plants and the environment are safeguarded against any harmful effects(1). One of the ways to ensure that disease is not spread by this means is to pasteurise the sludge before application to land. Where pasteurisation has followed sludge digestion re-infection of the sludge has been a problem(2), but other workers have shown that pasteurisation before digestion is satisfactory(3).
