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在生物法烟气脱硫技术(Bio-FGD)和络合吸收生物还原脱硝技术(BioDeNO_x)基础上,提出了生物结合络合吸收同步脱硫脱硝的工艺思路,该工艺利用加入Fe(Ⅱ)EDTA的碱性吸收液同时吸收烟气中的二氧化硫(SO_2)和一氧化氮(NO).本研究在厌氧反应器中实现烟气脱硫脱硝吸收产物硫酸盐和Fe(Ⅱ)EDTA-NO/Fe(Ⅲ)EDTA的同步去除.结果表明,水力停留时间为16 h,p H维持在7.0时,硫酸盐的平均去除率为95.16%,Fe(Ⅱ)EDTA-NO的平均去除率为96.61%.硫酸盐的还原产物主要以液相中硫离子和气相中硫化氢的形式存在,Fe(Ⅱ)EDTA-NO的最终还原产物为N2.反应运行的各个阶段均可实现Fe(Ⅲ)EDTA的还原,但还原率会随HRT降低而下降.第5阶段反应器中主要的硫酸盐还原菌为Desulfomicrobium,同时存在异养反硝化菌Pseudomonas与两种硫自养反硝化菌Sulfurimonas与Sulfurovum,并发现了两种具有还原单质硫功能的菌属Thermovirga与Mesotoga.
Based on Bio-FGD and BioDeNOx, a novel bioconjugation-absorption simultaneous desulfurization and denitrification process was proposed. This process utilizes Fe (II) EDTA Alkaline absorbent absorbs sulfur dioxide (SO2) and nitric oxide (NO) in the flue gas at the same time.In this study, the flue gas desulphurization and denitrification products sulfate and Fe (II) EDTA-NO / Fe Ⅲ) EDTA.The results showed that the average removal rate of sulfate was 95.16% and that of Fe (Ⅱ) EDTA-NO was 96.61% when the hydraulic retention time was 16 h and p H was maintained at 7.0. The reduction products of salt mainly exist in the form of sulfide in the liquid phase and hydrogen sulfide in the gas phase, and the final reduction product of Fe (Ⅱ) EDTA-NO is N2. The reduction of Fe (Ⅲ) EDTA can be achieved in all stages of the reaction operation, But the reduction rate will decrease with the decrease of HRT.The main sulphate reducing bacteria in stage 5 reactor are Desulfomicrobium with the simultaneous existence of heterotrophic denitrifying bacteria Pseudomonas and two sulfur autotrophic denitrifying bacteria, Sulfurimonas and Sulfurovum, Species Thermovirga and Mesot with the function of reducing elemental sulfur oga.