生物还原-化学沉淀去除烟气SO_2中Na_2SO_3和硫化物的研究  

REMOVAL OF SO_2 BY COMBINED PROCESSES OF MICROBIAL DEOX IDIZATION AND CHEMICAL PRECIPITATION

作　　者：程为[1] 辛宝平[1] 霍祥明[1] 李玉平[1] 

机构地区：[1]北京理工大学化工与环境学院环境工程系,北京100081

出　　处：《环境化学》2005年第5期506-509,共4页Environmental Chemistry

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,SO23-去除趋于完全.FeCl2生化反应培养7d后,SO23-去除趋于完全.In this paper, removal of SO2 and production of sulfide by combined processes of microbial deoxidization and chemical precipitation were proposed. The effects of carbon-source type, acetic-acid concentration, precipitant dosage and reaction time on SO3^2- removal were investigated. The results showed that presence of precipitant causes quick generation of sulfide precipitate due to chemical precipitation between metal ion and S^2- from SO3^2- reduction by SRB, inhibiting the other reaction of S^2-. It is optimum for the SO3^2- removal that molecular concentration rate between acetic-acid C and SO3^2- equal to one. SO3^2-removal increases with the increase in precipitant dosage. The reaction for SO3^2-removal approaches to finish after 14 day incubation when the precipitant was ZnCl2. The reaction for SO3^2- removal approaches to finish after 7 day incubation when the precipitant was FeCl2.

关 键 词：二氧化硫 生物还原 化学沉淀 去除率 Na2SO3 硫化物 SO2 硫酸盐还原菌(SRB) 烟气 SO3^2- 

分 类 号：X701.3[环境科学与工程—环境工程]