生物还原-化学沉淀去除烟气SO2中Na2SO3和硫化物的研究
REMOVAL OF SO2 BY COMBINED PROCESSES OF MICROBIAL DEOX IDIZATION AND CHEMICAL PRECIPITATION
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摘要: 利用硫酸盐还原菌(SRB)和金属离子沉淀剂对烟气SO2进行生物还原-化学沉淀去除,考察了碳源类型、乙酸(碳源)浓度、沉淀剂投加量和反应时间对SO32-去除的影响,研究表明,沉淀剂的加入导致SRB转化产生的S2-能很快生成硫化物沉淀,其它副反应被抑制.乙酸C原子/SO32-的浓度比为1时,SO32-去除最大.随着沉淀剂投加量的增加,SO32-去除率增大.ZnCl2生化反应培养14d后,SO32-去除趋于完全.FeCl2生化反应培养7d后,SO32-去除趋于完全.Abstract: In this paper, removal of SO2 and production of sulfide by combined pr ocesses of microbial deoxidization and chemical precipitation were proposed. The effects of carbon-source type, acetic-acid concentration, precipitant dosage and reaction time on SO32- removal were investigated. The results sh owed that presence of precipitant causes quick generation of sulfide precipitate due to chemical precipitation between metal ion and S2- from SO32- reduction by SRB, inhibiting the other reaction of S2-. It is optimu m for the SO32- removal that molecular concentration rate between ac etic-acid Cand SO32- equal to one. SO32-removal increa ses with the increase in precipitant dosage. The reaction for SO32- removal approaches to finish after 14 day incubation when the precipitant was ZnCl2. The reaction for SO32- removal approaches to finish after 7 day incubation when the precipitant was FeCl2.
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Key words:
- SO2 /
- microbial deoxidization /
- sulfate reduci ng bacteria (SRB) /
- chemical precipitation
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