| 假单胞菌DN-1再生NO络合吸收液的特性 |
| 摘要点击 1555 全文点击 1537 投稿时间：2003-09-28 修订日期：2003-12-08 |
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| 中文关键词 NO吸收液 微生物还原 NOx 假单胞菌 |
| 英文关键词 NO absorption solution bio-rduction NOx Pseudomonas |
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| 中文摘要 |
| FeⅡ(EDTA)络合吸收脱除NO吸收速率快,吸收容量大,但是存在吸收液再生方面的缺陷.实验用自行分离得到的假单胞菌DN-1,将吸收液中的FeⅡ(EDTA)NO还原为N2而进行再生.考察了不同碳源种类、碳源量、菌种量、pH值、温度、络合物浓度等条件下该菌种对FeⅡ(EDTA)NO的还原情况.结果表明,葡萄糖比醋酸钠、柠檬酸三钠和乙醇等更适合于作为该体系的外加碳源.当FeⅡ(EDTA)NO浓度为6.50 mmol·L-1时,添加250 mg·L-1的葡萄糖就能满足微生物的反应需要;DN-1还原适宜温度范围为40～45℃,适宜pH值为6.9～7.2;还原速率随菌体接种量的增多而加快;而FeⅡ(EDTA)NO浓度小于11.8 mmol·L-1时,还原速率随着络合物浓度的增加而增加;超过这一浓度,还原速率不再随络合物浓度的增加而增加,反应速率基本不变.
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| 英文摘要 |
| Metal chelate absorption is deemed as a promising method of NO removal in FGD system,but the difficulty in the regeneration of the absorption solution hinders its further development.An original method with microbial reduction is proposed in this paper.With the adding of Psudomonas sp.DN-1,which was newly isolated from wastewater treatment plant,FeⅡ(EDTA)NO will be reduced to the environmentally benign gaseous product of N2,and thus FeⅡ(EDTA) was regenerated simultaneously.The effects of the types and amount of carbon source,FeⅡ(EDTA)NO concentration,pH,temperature and the biomass inoculation on bio-reduction efficiency were investigated.The results showed that the microorganism exhibited good performance on bio-reduction of FeⅡ(EDTA)NO with the carbon sources of glucose.250 mg·L-1 glucose was enough for microorganism to reduce 6.50 mmol·L-1 FeⅡ(EDTA)NO completely.The rate of FeⅡ(EDTA)NO reduction did not increase with adding a larger amount of carbon source.The bio-reduction could be achieved efficiently among the temperature range of 40～45℃ and a pH range of 6 9～7 2.The bio-reduction rate increased with the increasing of biomass inoculation.When FeⅡ(EDTA)NO concentration is less than 11 8 mmol·L-1,the reduction rate increased as the concentration increases,while the concentration is over 11.8 mmol·L-1,the reduction rate keeps constant. |
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