摘要
提出了用微生物转化-化学沉淀法将烟气中SO2转化为ZnS的新工艺.考察了碳源类型、乙酸浓度、ZnCl2量和反应时间对SO32-去除和ZnS生成的影响,应用XPS和XRD对生成的ZnS进行了分析.研究表明,ZnCl2加入导致硫酸盐还原菌SRB转化产生的S2-快速生成ZnS沉淀,而其他副反应被抑制.当乙酸C原子/SO32-物质的量浓度比为1时,SO32-去除和ZnS生成最大.随着ZnCl2量增加,ZnS生成量增加,但过量ZnCl2造成Zn利用率下降和ZnS中Zn(OH)2杂质增多.随生化反应时间增加,SO32-的去除率与ZnS生成率也增加,并且X-射线衍射表明生成的ZnS为六方晶系α-ZnS.
With a view of SO2 resourse-making treatment to producing ZnS with microbial transformation and chemical precipitation; the influence of carbon-source type, acetic-acid concentration, ZnCI2 dosage and reaction time on SO3^2- removal and ZnS generation were investigated; and the generated ZnS applying XPS and XRD was analyzed. Addition of ZnCl2, inducing SRB transformation, S2- generated ZnS precipitation very quickly, and other attached reaction was inhibited. The SO3^2- removal and ZnS generation were the greatest when the molecular concentration ratio of acetic-acid C atom/SO3^2- was 1. ZnS generating amount increases with increase of ZnCl2 dosage; but ZnCl2 overdose resulted in lowering of Zn utilizing rate and increase of Zn（OH）2 foreign substances in ZnS. The SO3^2- removal and ZnS generation tended to be complete after 14 day incubation. The structure analysis showed that generated ZnS was hexagonal system α-ZnS.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2005年第4期455-459,共5页
China Environmental Science
基金
北京理工大学基础研究基金项目(BITUBF200305E19)
关键词
二氧化硫
生物转化
硫酸盐还原菌
化学沉淀
硫化锌
SO2
microbial transformation
sulfate reducing bacteria （SRB）
chemical precipitation
ZnS
