细菌菌液脱除H2S的工艺条件

通过Fe2(SO4)3对H2S的吸收实验，初步研究了氧化亚铁硫杆菌培养液脱除含H2S气体的工艺条件。利用单因素实验考察了不同气体流速、吸收液初始Fe3+浓度、初始pH值等条件下，吸收过程中脱硫效率的变化。实验结果表明气体流速为影响气液传质速率的主要因素，初始Fe3+浓度及初始pH值为对其影响不大。实验得到适宜的脱硫条件为：气体流速60 mL·min－1，初始Fe3+]为10 g·L－1，初始pH值为2.0。在该条件下，氧化亚铁硫杆菌培养液脱除H2S的脱硫效率可以稳定在90％左右。

Technology of removing hydrogen sulfide by bacterial cultures

The absorption of H2S in acid solution of Fe2(SO4)3 was carried out in order to study the technology of removing H2S by bacterial cultures of Thiobacillus ferrooxidans. Single factor test was designed to test the profile of desulfurization efficiency under different conditions of liquid–to–gas ratio (L/V), initial concentration of Fe3+(Fe3+]) and pH. Simulation analysis showed that the gas–liquid mass transfer rates in this experiment was much smaller than chemical reaction rate and was the controlling step of the H2S absorption process. The experiment results proved that liquid–to–gas ratio was the dominant factor of gas–liquid mass transfer rates, but initial Fe3+] concentration and pH showed little effect. The optimal operation conditions were as follows L/V=0.6min－1；Fe3+]=10 g·L－1; pH=2.0. Under such conditions, the efficiency of removing H2S by bacterial cultures was around 90%.