The application of biological desulfurization has less energy consumption and high removal rate, but biological desulfurization also has its own limitations. It is necessary to create a suitable environment for sulfur bacteria to ensure their high biological activity in order to achieve a good desulfurization effect.
1. Control of pH value. When the pH value of desulfurization circulating water is maintained between 2 and 3, a better desulfurization effect can be achieved. When the pH value changes greatly, the activity of sulfur bacteria drops sharply and even loses its activity. For example, when the pH value is adjusted from 2 to 3 to 5 to 7 in this project, the biological desulfurization tower almost completely loses its desulfurization effect. Therefore, in biological desulfurization, it is very important to maintain a stable pH value, which will directly affect the quality of desulfurization effect.
2. Control of DO concentration. The reactions of H2S and O2 in the gas tank are difficult to occur, and the reactions of biological desulfurization mainly occur in the liquid phase. Therefore, the concentration of DO (dissolved oxygen) in the circulating spray water in the desulfurization tower is an important factor affecting biological desulfurization.
3. Control of H2S load. Practical engineering operation found that within the acceptable range of sulfur bacteria, the higher the volume load of H2S, the better the microbial desulfurization response can adhere to the good operation effect, and it is not easy to occur the phenomenon of rapid acidification of circulating water.
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