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Seventy percent of acid rain comes from sulphur dioxide that dissolves into water to form sulphuric acid. The rest comes from various oxides of nitrogen. The cleaning of coal was originally used to reduce costs from transporting inert material and improving the quality and uniformity of coal. This process has also found to be useful in reducing sulfur content. The process is performed gravitationally and is dependent of the density of the sulfur. It is …

…popular choice. The flue gas enters the absorber and is re-emitted after being scrubbed, at which time the waste solids are removed and disposed of. Dry scrubbing involves the contact between drying gas and the atomized liquid (alkaline based). Upon contacting the flue gas, the drying gas will convert the atomized droplets into a dry product that can be separated and disposed of. The dry scrubbing process requires less power to complete than wet scrubbing.