Destino dei radionuclidi negli impianti di depurazione delle acque reflue urbane

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Abstract

[automatically translated] The study presented in this work has been focused on the monitoring and analysis of the fate of radionuclides in wastewater treatment plants and was conducted in collaboration between the University of Palermo and ARPA Sicily. It has plans to commission two experimental phases. During the first we were monitored treatment plants in the towns of Palermo Service (in town Water Corsairs and Green Fund), Bagheria and Cefalu; in the second phase of the survey it was limited to the plant of the Corsairs Water, where they had previously identified the main attractions cues. In both phases they were taken instantaneous samples in different sections of the object of the monitoring systems: influential, activated sludge tank, sludge recirculation, secondary sedimentation tank effluent and dewatered sludge. The samples were analyzed in order to determine the activity of the main man-made radioisotopes, due to their medical use, or the environment. The identification and quantification of radioisotopes in samples were conducted by means of gamma spectrometry, using the instruments available at the University of Palermo and the Laboratory of radioactivity of the Palermo Territorial Structure of ARPA Sicily. The activities of radionuclides detected in the various sampling points were used for radiological risk assessment of workers and check compliance with the exposure limits. The results obtained have generally demonstrated that the radiosotopo more present in the samples analyzed were the 131I, probably because of its high half-life. In addition there was a greater affinity of the radionuclides in respect of the solid component present in the waste water, a circumstance which implies their progressive transfer in sewage sludge, with particular reference, for the 131I to the organic fraction present in them. However, the 131I activity detected in sewage sludge were below the limits imposed by law (Legislative Decree no. 230/95, Legislative Decree no. 241/00), for their disposal. with particular reference, for the 131I to the organic fraction present in them. However, the 131I activity detected in sewage sludge were below the limits imposed by law (Legislative Decree no. 230/95, Legislative Decree no. 241/00), for their disposal. with particular reference, for the 131I to the organic fraction present in them. However, the 131I activity detected in sewage sludge were below the limits imposed by law (Legislative Decree no. 230/95, Legislative Decree no. 241/00), for their disposal.
Original languageItalian
Publication statusPublished - 2013

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