The Assessment of SO2 Emitted into Atmosphere by the Pyrometallurgical Complex of Ghazaouet (NW, Algeria)
Hazardous chemicals escape to the environment by a number of anthropogenic activities. Air pollution has both acute and chronic effects on human health, affecting a number of different systems and organs. Ghazaouet city homes a Metallurgical company (En-Metanof) producing zinc by pyrometallurgical process. This coastal city, in which winds are of NW and NE directions, is surrounded by cliffs. The soil and atmospheric environments in the area of the city are polluted by SO2 gases and aerosols issued by the main stack of the plant.
The maximum content of SOX that can be diffused into the atmosphere by the main stack must be less than 0.156%. Thus, the SO2 gases content of 120 samples taken on the ground were analyzed. These measures were classified in four stations installed according to winds directions in relation of Gauss law. SO2 contents were analyzed by the specific and well adapted method using sodium tetrachloromercurate. This method allows the measurement of very low contents of sulphur dioxide (lower than 100 μg/m3), during the very short periods of sampling (5 min to 6 h).
The interpretation of obtained results showed that concentrations of five samples taken at station S1 of the network sampling are higher than the EU standards. A maximum of 185 μg/m3; on a sampling period of 3 h 51 min, was recorded. Other theoretical, derived from simulations, and experiments results are below the raised standards. These contents are between 100–150 μg/m3 in 24 h and 40–60 μg/m3 for a year.
Adequate production and regular maintenance of plant installations would avoid fluctuations in gaseous rejections, which require a stable production of the metallurgical complex; consequently pollution is minimized and situated below the international standards whatever the meteorological conditions.
KeywordsSulphur Dioxide Lung Cancer Mortality Electrostatic Precipitator Vanadium Pentoxide Plume Height
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