The basic principle of biological desulfurization method based on biological sulfur cycle is as follows: firstly, under the catalysis of sulfide oxidizing bacteria, sulfide is biologically oxidized to elemental sulfur and can be recycled. In sulfide containing wastewater, the physical mechanism of sob oxidation and sulfide is as follows:
It can be seen from the above reaction formula that the process of sulfur sulfide's sob oxidation can be divided into two steps. The initial reaction is fast. The sulfide will release two electrons, and the elemental sulfur produced will accumulate outside the cell. These tiny particles are coated with a layer of biopolymer. In the second step, the reaction is slow and the initial sulfur is further oxidized to form sulfite or sulfate. For the reactor, in order to avoid the reaction in the second step, the loading of dissolved oxygen and sulfide must be controlled.
Biological desulfurization technology has changed the traditional theoretical limit. The theory of sulfide oxidizing bacteria combined with sulfate reducing bacteria has been developed gradually. Because sulfide oxidizing bacteria and sulfate reducing bacteria are easy to cultivate and have high activity. Aerobic and anaerobic reactors make engineering application possible.
Biological desulfurization plays a very important role as a catalyst in the production of biological desulfurization technology. According to the above-mentioned biological desulfurization principle, it can be known that the biological desulfurization of sulfur-containing waste alkali solution generally includes two stages: oxidation reaction and reduction reaction, which are composed of sulfide oxidizing bacteria and sulfate reducing bacteria respectively.
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