Since 1997 the presence of Tetrachlorethylene (PCE) has been recognized in the drinking water wells field (DWWF) of the Pianura Padana plain. In this framework a detailed hydrogeological and hydrogeochemical study was performed to formulate a hypothesis on the origin of PCE contamination. The studied system is a multilayer aquifer with four permeable horizons, made up of gravel and sandy-gravel, intercalated to low-permeable horizons (clay and silt). The drinking water wells field is composed by five wells that intercept all the four levels. The first step of this investigation consisted of collecting information about location of potential pollutant sources like factories that might produce or use PCE, and of reconstruction of geological and hydrogeological features of studying area. In the second step, a field survey has been realized. Sampling waters from DWWF, domestic wells, piezometers and superficial waters around the area and measurement of piezometric levels have been carried out in February 2010. These levels were noted in static condition except for that of the main drinking well, which is continuously pumping. Temperature, pH, Eh, electric conductivity and alkalinity were measured in the field, whereas major and minor ion (Cl -, SO42-, NO3-, Na+, K+, Ca2+, Mg2+, Cr TOT) and isotopic content (δ18O‰ e δ2H‰) were analyzed in the laboratory using routine methods. Tetrachlorethylene, trichlorethylene, benzene, carbon disulfide, 1,1,1-trichlorethane, dimethylsulfide, toluene, 1,1,1-trichlorethane, ethylbenzene were determined according to TASSI et alii (2008), in order to recognized hydrochemical facies and to mapping the concentration of PCE on field survey. The elaboration of piezometric levels allowed to understand the flow pattern of studying area in two extreme stress condition of the aquifer.
Tetrachloroethylene contamination on drinking water wells field in Pianura Padana
Doveri M;
2010-01-01
Abstract
Since 1997 the presence of Tetrachlorethylene (PCE) has been recognized in the drinking water wells field (DWWF) of the Pianura Padana plain. In this framework a detailed hydrogeological and hydrogeochemical study was performed to formulate a hypothesis on the origin of PCE contamination. The studied system is a multilayer aquifer with four permeable horizons, made up of gravel and sandy-gravel, intercalated to low-permeable horizons (clay and silt). The drinking water wells field is composed by five wells that intercept all the four levels. The first step of this investigation consisted of collecting information about location of potential pollutant sources like factories that might produce or use PCE, and of reconstruction of geological and hydrogeological features of studying area. In the second step, a field survey has been realized. Sampling waters from DWWF, domestic wells, piezometers and superficial waters around the area and measurement of piezometric levels have been carried out in February 2010. These levels were noted in static condition except for that of the main drinking well, which is continuously pumping. Temperature, pH, Eh, electric conductivity and alkalinity were measured in the field, whereas major and minor ion (Cl -, SO42-, NO3-, Na+, K+, Ca2+, Mg2+, Cr TOT) and isotopic content (δ18O‰ e δ2H‰) were analyzed in the laboratory using routine methods. Tetrachlorethylene, trichlorethylene, benzene, carbon disulfide, 1,1,1-trichlorethane, dimethylsulfide, toluene, 1,1,1-trichlorethane, ethylbenzene were determined according to TASSI et alii (2008), in order to recognized hydrochemical facies and to mapping the concentration of PCE on field survey. The elaboration of piezometric levels allowed to understand the flow pattern of studying area in two extreme stress condition of the aquifer.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
