Investigation Of The Sulfides Distribution Characteristics In Soil And Water Around The Thermal Power Plant And Its Relationship To Sulphur Emissions

With the rapid economy development, it continues growth in energy demand, thermal power plant plays a leading role in the energy structure of China. The pollutant derived from thermal power plant is a main local pollution contributor, and it has great effects on surrounding environment, so it has significant importance to analyze the sulfur distribution pattern of the soil and water around the thermal power plant and its correlation with the emissions of sulfur compounds. In this paper, Taiyuan first thermal power plant has been selected as research objective, the morphology and composition of the sulfur compounds in soil and water were analyzed located in 500 m, 1km, 2km and4 km away from the main wind frequency of Taiyuan first thermal power plant,the main results can be shown as follows:(1)Spatial distribution rule of sulfide compounds in soil. The spatial distribution trend of total sulfur, sulfate ion and sulfite ion concentration value in soil were basically similar, With the increasing of distance from thermal power plant, the concentration of sulfate ion and sulfite ion increased, until themaximum concentration value emerged at about 2 km from thermal power plant,and then with the increasing of distance from thermal power plant, the concentration decreases rapidly, and this conform with the emission pollutant from power plant elevated source of changes in main wind frequency direction.In different soil profiles, from section 1 to section 8 the total sulfur, sulfate ion and sulfite ion concentration value in soil showed a "M" type trend in different seasons, there was a two peaks around section 2 and section 7 about2 km away from thermal power plant, the maximum concentration value of appeared in sampling section 7 in summer, the maximum concentration value of appeared in sampling section 2 in autumn and winter.The change trend of total sulfur, sulfate ion and sulfite ion concentration value in depth of 20-50 cm and 100 cm soil profiles are approximately the same as that in depth of 5-20 cm, soil profiles total sulfur, sulfate ion and sulfite ion concentration value in each section: 5-20 cm soil profiles concentration value>20-50 cm soil profiles concentration value>100cm soil profiles concentration value. Thermal power plant as the only one source of sulfur pollution in this area. It is further proved that there is a direct relationship between the sulfur pollution in the soil and the atmospheric emission of thermal power plant.(2)The changes rules of total sulfur, sulfate ion and sulfite ion in different soil profiles under different seasons. In different soil depth sampling, with the increasing of distance from thermal power plant, Sulfides concentration value insoil showed a inverted "V" type change trend,5-20 cm and 20-50 cm soil profiles total sulfur, sulfate ion and sulfite ion concentration value were higher, the concentration value change largely in different sections, but the 100 cm soil profiles total sulfur, sulfate ion and sulfite ion concentration value were lower,the the concentration value change smaller in different sections, the result showed that sulfur pollution in 5-20 cm and 20-50 cm soil profiles were more serious in different seasons, especially for 5-20 cm pollution is the most serious,the 100 cm soils profiles was polluted slightly, Sulfur pollution in winter is much higher than that in summer and autumn.(3)The changes rules of sulfide in water. the change trend of sulfide concentration value is the generally same as the trend of total sulfur, sulfate ion and sulfite ion concentration value in soil, With the increasing of distance from thermal power plant, the concentration of sulfate ion and sulfite ion increased,until the maximum concentration value emerged at about 2 km from thermal power plant, and then with the increasing of distance from thermal power plant,the concentration decreases.The concentration value in water change trend showed a slow rise and slow down, then rise rapidly, after the rapid decline from June to August(in summer),the section 4,3,2,1 of total sulfur, sulfate ion and sulfite ion concentration value were higher than the section 5,6,7,8, respectively. However, the change trend of the concentration of sulfide in winter is opposite to that in summer, the change trend of total sulfur, sulfate ion and sulfite ion concentration value with theincreasing of distance from thermal power plant showed a inverted "V" type change trend, the section 4,3,2,1 of total sulfur, sulfate ion and sulfite ion concentration value were a little different from the concentration value of section 5,6,7,8, and the section 4,3,2,1 of sulfide concentration value were slightly higher than section 5,6,7,8.From section 4 to section 1, sulfide concentration value in winter was much greater than that in summer and autumn, however, from section 5 to section 8, sulfide concentration value in summer were slightly higher than that in autumn and winter. There was a two peaks around section 2 and section 7about 2km away from thermal power plant in different seasons, the maximum total sulfur concentration value in winter was 4.65 times of the highest in autumn, the maximum total sulfur concentration value in winter was 1.93 times of the highest in summer; the maximum sulfate ion concentration value in winter was 4.62 times of the highest in autumn, the maximum total sulfur concentration value in winter was 2.76 times of the highest in summer; the maximum sulfite ion concentration value in winter was 4.62 times of the highest in autumn, the maximum total sulfur concentration value in winter was 2.76 times of the highest in summer. As a whole, the distribution change rules of sulfide compounds in soil and water, which was in accordance with the variation of the sulfide compounds concentration value in the main wind frequency of power plant elevated source, the sulfide compounds concentration value in soil and water increased first and then decreased in the main windfrequency of power plant elevated source, and power plant elevated source as a pollution center, the maximum sulfide compounds concentration value in downwind direction, the thermal power plant as the sole source of sulfur pollution in the region, indicating that these changes in the concentration of sulfide was mainly caused by the thermal power plant.