This paper presents a survey of irradiation treatment of sewage sludge in the world. Since the first sludge irradiation plant was built in Geiselbullach, West Germany in 1973 which used 60Co as irradiation source, many sludge irradiators were constructed in USA, India, Japan, Canada, Poland and so on, which used 60Co, 137Cs or electron beam as irradiation sources. Some basic researches on irradiation treatment of sewage sludge are,respectively, reviewed, including optimization of irradiation parameters, synergistic effect of radiation with heat, oxygenation, irradiation-composting and potential applications of treated sludge. Some proposals have been suggested for further development of this technology.
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