No abstract

No abstract

No abstract

No abstract

We analyze in this paper a Waste Water Pre-Treatment Plant (WWTP) located at the Mediterranean coast with air radon concentration above Spanish action level (600 Becquerel per cubic meter). This paper presents a method for radon equilibrium determination by gamma spectrometry measuring of the radon progeny concentrations in the air, in order to estimate WWTP workers effective dose more exactly. The method is based on simultaneous sampling of air through a filter paper and alpha spectrometry measurement of radon activity concentration in the air. According to the measured radon activity concentration in the air of 368±45 Bq/m 3 the equilibrium factor between radon and progenies is estimated to be F = 0.27, which is in good agreement with expected values.

ABSTRACT. This research was conducted in order to evaluate the effect of plastic biodigester semicontinuous flow of bacteriological parameters (coliforms) in the treatment of effluents in small-scale pig farm. Three points within the system were used for sampling: drinking water pigs, pig slurry (water entering the digester), Bio (water that emerges from the digester), every 21 days over a period of 70 days, from July 2015. the samples were subjected to analysis to determine total and fecal coliforms by the method of Most Probable Number (MPN). The study revealed that drinking water samples from animals tested negative microbiological results, while the purines and the biol positive microbiological results were obtained. It was found the presence of coliform species: Proteus spp, Escherichia coli, Klebsiella, Citrobacter freundii. However, samples obtained before entering the digester (B) with then taken anaerobic process (C), maintained the maximum bacterial load, with no statistically significant differences (p> 0.05). RESUMEN.El presente trabajo de investigación fue realizado con el objetivo de evaluar el efecto del biodigestor tubular plástico de flujo semi-continuo sobre los parámetros bacteriológicos (contenido de coliformes fecales) en el tratamiento de efluentes en explotación porcina a pequeña escala. Tres puntos dentro del sistema fueron utilizados para la toma de muestras: agua de bebida de los cerdos, purines de cerdo (agua que ingresa al biodigestor), biol (agua que emerge del biodigestor), cada 21 días en un periodo de 70 días, a partir del mes de julio de 2015. Las muestras fueron sometidas a análisis para determinar los coliformes totales y fecales por el método del Número Más Probable (NMP). El estudio reveló que las muestras de agua del bebedero de los animales arrojaron resultados microbiológicos negativos, en tanto que de los purines y el biól obtuvieron resultados positivos. Se pudo constatar la presencia de coliformes de las especies: Proteus spp, Escherichia coli, Klebsiella, Citrobacter freundii. Sin embargo, las muestras obtenidas antes de ingresar al biodigestor (B) con las tomadas luego del proceso anaeróbico (C), mantuvieron la máxima carga bacteriana, no encontrándose diferencias estadísticamente significativas (p>0,05).

This study presents a rapid and novel sequential separation strategy based on extraction chromatography for determining 90Sr, 210Pb and 210Po in drinking water samples. It involves the use of Sr resin for the separation and then liquid scintillation counting and alpha spectrometry for the determination. The experimental results obtained showed that the proper acidic solution to quantitatively retain the aforementioned radionuclides is 3 M HNO3. The optimum eluents were determined for obtaining quantitative recoveries (70–80%) of 90Sr, 210Pb and 210Po. The method was validated with intercomparison water samples and is satisfactory in terms of minimum detectable activities, which are 50% lower than that established in RD 314/2016.

According to World Health Organization (WHO), the radon is the second leading cause of lung cancer. This work is centered on a Waste Water Pre-Treatment Plant (WWTP) with radon concentration above Spanish action level (600 Becquerel per cubic meter). The authors have developed a novelty method based on gamma and alpha spectrometry to measure the radon equilibrium factor. At the same time, a Matlab© algorithm (UPVDose) has been coded based on the International Commission on Radiological Protection (ICRP) 66 Human Respiratory Tract Model for Radiological Protection (HRT), to calculate the inhalation doses received by workers of this treatment plant due to the radon progeny. The effective doses of the workers obtained in the human respiratory tract are found to be low, but results are very dependent on the radionuclide type of absorption.