What Are Sulfur Emissions?

The pollution of sulfur to the environment mainly refers to the pollution of sulfur oxides and hydrogen sulfide to the atmosphere, and the pollution of water bodies by sulfate and hydrogen sulfide. Elemental sulfur is commonly known as sulfur. It is a yellow needle-like crystal or an unfixed solid with sublimation properties. Sulfur is abundant in the earth's crust and widely distributed on the earth. Sulfur is contained in fossil fuels such as coal, oil, and natural gas, as well as non-ferrous metals, ferrous metal deposits, and even protein molecules with metabolic functions. The most active sulfur-containing compounds in the Earth's sulfur cycle include sulfur oxides, hydrogen sulfide, and sulfates, as well as proteins that serve as the life carrier of the earth.

Sulfur pollution refers to the pollution caused by sulfur and its compounds in the environment. Sulfur is widely distributed in the earth's crust, and various fossil fuels (coal, petroleum, etc.) contain sulfur. Sulfur exists in the environment as a large amount of sulfur oxides, and partly exists as hydrogen sulfide and organic sulfur (such as mercaptans, thioethers, dimethylsulfide, etc.), and has a very irritating malodor pollution. An important pollutant of sulfur in the atmosphere is sulfur dioxide. Sulfur trioxide and sulfate, they mainly come from mineral combustion, smelting of sulfur-containing ore and production of sulfuric acid and phosphate fertilizer. The anthropogenic emissions of sulfur dioxide around the world are about 150 million tons per year, of which over 70% is burned by fossil fuels. More than 90% of the sources of sulfur dioxide emissions are concentrated in cities and industrial areas in the northern hemisphere, causing various air pollution problems in these areas. For example, many smoke events caused by soot occurred in London, England, and acid rain in northern Europe, North America, and southwestern China. The main sulfur pollutants in wastewater are sulfate and hydrogen sulfide. Some acidic mineral waters contain large amounts of sulfate ions. Sulfate ions in domestic sewage mainly come from human excreta. Sulfate in the soil hardly degrades and enters surface and groundwater through leaching. Sulfate in the atmosphere mainly exists in the form of solid particles, and it sinks to the ground with rain or gravity, and is an important source of surface water and soil sulfur pollution and acidification. Sulfate aerosol and sulphuric acid mist will reduce the visibility of the atmosphere and corrode metal materials and buildings. They are about 10 times more toxic than sulfur dioxide and are harmful to humans, organisms and goods. China stipulates that the daily average maximum allowable concentration in the atmosphere of a residential area is 0.15 mg / m ³ , and the measured value at any one time should not exceed 0.50 mg / m ³ . The prescribed concentrations of sulfuric acid were 0.1 mg / m ³ . And 0.30 mg / m ³ . The maximum allowable concentration of sulfide (as S) for farmland irrigation water is 1mg / L. The maximum allowable concentration of sulfide in fishery water is 0.2mg / L. ^[1]

Sulfur is also called sulfur. It is a yellow solid, which can combine with oxygen, hydrogen, halogen (except iodine) and most metals. The valence is +2, +4, +6. Sulfur is widely distributed and abundant in the crust. All fossil fuels contain sulfur,

China's "Atmospheric Environmental Quality Standards" stipulates: Nature Reserves, Scenic Spots, etc. implement first-level standards, the average daily SO ₂ concentration value shall not exceed 0.05 mg / m3, and the measured value of any one sampling shall not exceed 0.15 mg / m3; Districts, cultural districts and other areas implement secondary standards, the average daily SO ₂ concentration value must not exceed 0.15 mg / m3, and the measured value of any one sampling must not exceed 0.50 mg / m3; industrial areas and other areas implement third-level standards, SO ₂ days The average concentration value shall not exceed 0.25 mg / m3, and the measured value at any one time shall not exceed 0.70 mg / m3. ^[2]