Method for desulfurizing waste gas and reutilizing sulfur source

Abstract

The invention provides a method for desulfurization from a SO2- laden waste gas and for recovery of the sulfur resource. A basic absorption liquid neutralizes the SO2- laden waste gas, discharge the purified gas when the content of SO2 reaches the standard; microbe reduces the desulfurizing absorption tail liquid (containing bisulphate group), and then the liquid is oxygenized with chemical treatment to recover elemental sulfur. The desulfurizing absorption tail liquid treated by microbe is basic, and it can return directly to the desulfurizing absorption unit and be reused as a basic absorption liquid; the chemical oxidant is oxygenized by microbe to revive. The invention realizes the aim of eliminating waste and recycling sulfur resource. And it is easy to operate and leads to none secondary pollution.

Description

1. Technical field [0001] The invention relates to a technology for desulfurizing waste gas containing sulfur and recycling sulfur resources, more specifically to a method for desulfurizing waste gas containing sulfur dioxide and recycling sulfur resources. 2. Background technology [0002] Sulfur dioxide emitted by fossil fuel combustion is one of the main causes of acid rain. Acid rain leads to acidification of soil and water systems, endangering forests and crops, and causing disastrous consequences to the human ecological environment. In 2000, my country's sulfur dioxide emissions were as high as nearly 20 million tons. Since 2003, the situation in areas heavily polluted by acid rain has been particularly severe. Therefore, it is urgent to take effective measures to reduce emissions or control sulfur dioxide. At present, the control of sulfur dioxide pollution can be divided into three ways, that is, desulfurization before combustion, desulfurization during combustion a...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the current waste gas desulfurization absorption tail liquid treatment and resource utilization ultimately comes down to the treatment of sulfur-containing wastewater. The common problems of the available methods of sulfur-containing compounds are: first, the high cost of desulfurization, such as the consumption of ammonia water in the desulfurization of the ammonia liquid absorption method, the consumption of sodium carbonate or sodium hydroxide in the sodium-alkali absorption method, oxidation The consumption of magnesium oxide in the magnesium method, the source of phosphate rock in the ammonium phosphate fertilizer method; the second is the secondary pollution problem in different degrees, such as the secondary utilization of gypsum in the gypsum method

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