hrvatski

UTJECAJ POSTROJENJA ZA EKSPLOATACIJU PRIRODNOG PLINA NA OKOLIŠ

Exploitation of natural gas at the gas field Molve has been provided more than 20 years. Natural gas and gas condensate have been extracted from 34 bores in Podravina on an area wider than 200 km2. The gas is then transported to the central gas station CPS Molve using a closed collection and transportation system. In addition to hydrocarbons, natural gas contains many other substances such as CO2, H2S, mercaptanes, Hg, and water which have to be removed at the Molve station by different technological processes. This paper presents the results of H2S, mercaptanes and SO2 monitoring at measuring sites MOLVE-9, MOLVE-10, and MOLVE-CGS in the area of influence of a central natural gas station Molve in 2011. Measurements were carried out one month in the summer and one month in the autumn. H2S levels exceeded the Croatian limit values (LV) at all three measuring sites, while the mercaptan levels exceeded the Croatian LV at MOLVE-10 in the autumn. The obtained results showed that the levels of SO2 mass concentrations were below LV. During the same measuring periods, at the same measuring sites, radiation was measured using ALARA dosimeters (expressed here as mean daily dose rates). Absorbed dose measurements were calculated on yearly base. At MOLVE-9 yearly equivalent dose was 0.680 ± 0.064 mSv, at MOLVE-10 0.855 ± 0.079 mSv and at MOLVE-CGS 0.772 ± 0.067 mSv. The measurements also showed that the refining processes at the gas station did not increase radioactivity in the environment. Observed variations were within the normal fluctuations.

na

nije evidentirano

engleski

IMPACT OF NATURAL GAS EXPLOITATION PLANT ON THE ENVIRONMENT

Exploitation of natural gas at the gas field Molve has been provided more than 20 years. Natural gas and gas condensate have been extracted from 34 bores in Podravina on an area wider than 200 km2. The gas is then transported to the central gas station CPS Molve using a closed collection and transportation system. In addition to hydrocarbons, natural gas contains many other substances such as CO2, H2S, mercaptanes, Hg, and water which have to be removed at the Molve station by different technological processes. This paper presents the results of H2S, mercaptanes and SO2 monitoring at measuring sites MOLVE-9, MOLVE-10, and MOLVE-CGS in the area of influence of a central natural gas station Molve in 2011. Measurements were carried out one month in the summer and one month in the autumn. H2S levels exceeded the Croatian limit values (LV) at all three measuring sites, while the mercaptan levels exceeded the Croatian LV at MOLVE-10 in the autumn. The obtained results showed that the levels of SO2 mass concentrations were below LV. During the same measuring periods, at the same measuring sites, radiation was measured using ALARA dosimeters (expressed here as mean daily dose rates). Absorbed dose measurements were calculated on yearly base. At MOLVE-9 yearly equivalent dose was 0.680 ± 0.064 mSv, at MOLVE-10 0.855 ± 0.079 mSv and at MOLVE-CGS 0.772 ± 0.067 mSv. The measurements also showed that the refining processes at the gas station did not increase radioactivity in the environment. Observed variations were within the normal fluctuations.

na

nije evidentirano