نوع مقاله : مقاله پژوهشی
نویسندگان
1 پژوهشکدهی کشاورزی هستهای، پژوهشگاه علوم و فنون هستهای، صندوق پستی: 1498-31465، کرج- ایران
2 گروه مهندسی تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه زنجان، صندوق پستی: 45195-313، زنجان - ایران
کلیدواژهها
عنوان مقاله English
نویسندگان English
Sewage sludge is an inevitable byproduct of wastewater treatment plants and a valuable source of essential plant nutrients. With inactivation of its pathogenic microorganisms by gamma radiation can be recycled as soil organic fertilizer. This research evaluates the sludge treatment by gamma irradiation with/without pasteurization on the removal of main indicators pathogenic in the South of Tehran waste water treatment plant sludge (WWPTs). Gamma irradiation (0, 5, 10, 15, 20 kGy), pasteurization (70 and 180 °C) and their combination were used to examine bacterial indicators such as Fecal Coliform, Staphylococcus, Salmonella, and Escherichia (E. coli). There were some pathogenic bacteria in this organic fertilizer that exceeded the standards and could not be classified as class B or P3 according to the American and Iranian standards. Application of gamma irradiation at least 10 kGy dose, alone, and combination of gamma irradiation (at least 10 kGy) and pasteurization were sufficient for complete inactivation of four pathogenic bacteria indicators, However, the pasteurization methods alone were not able for removal them completely. Generally, gamma irradiation of sewage sludge to produce organic soil fertilizer is carried out in accordance with national and international standards. It is sufficient and cost-effective compared to two methods.
کلیدواژهها English