The glucose mass transfer in the biosynthesis of succinic acid with immobilized Actinobacillus succinogenes cells has been comparatively analyzed for a bioreactor with mobile bed vs. a stationary basket bioreactor. Th...The glucose mass transfer in the biosynthesis of succinic acid with immobilized Actinobacillus succinogenes cells has been comparatively analyzed for a bioreactor with mobile bed vs. a stationary basket bioreactor. The process has been considered to occur under substrate and product inhibitory effects. The results indicated that the bioreactor with mobile bed is more efficient for biocatalyst particles with a diameter over 3 mm, while the basket bioreactor is more efficient for smaller biocatalyst particles and basket bed thickness below 5 mm. The performances of both configurations of immobilized A. succinogenes cell beds were found to be superior to the column packed bed bioreactor.展开更多
针对污水处理厂深度脱氮需求,选用黄铁矿(FeS_(2))和聚羟基丁酸戊酸酯(PHBV)两种材料,构建应用于污水处理厂二级出水深度脱氮的反硝化生物填充床,通过进出水水质监测、材料结构表征(扫描电镜)、高通量测序等技术手段,探究了FeS_(2)-PHB...针对污水处理厂深度脱氮需求,选用黄铁矿(FeS_(2))和聚羟基丁酸戊酸酯(PHBV)两种材料,构建应用于污水处理厂二级出水深度脱氮的反硝化生物填充床,通过进出水水质监测、材料结构表征(扫描电镜)、高通量测序等技术手段,探究了FeS_(2)-PHBV协同自养-异养反硝化体系的工艺运行效果及机理.结果表明,FeS_(2)-PHBV协同反硝化体系脱氮速率优于单独FeS_(2)自养体系,当水力停留时间为2h时,脱氮效率为90%以上,且产生更少的硫酸盐副产物.相比于单独PHBV异养体系,协同体系在达到相同总氮去除效果的同时释放更低的DOC(23.62mg/L).FeS_(2)-PHBV协同体系中两种材料表面结构均较利用前发生了显著变化,这是由于材料表面生物膜的富集和利用.共混反应器内优势菌群为厌氧发酵菌属(Sporomusaceae)和梭菌属(Clostridium sensu stricto 7),两者实现了共混体系异养-自养的协同反硝化效果,其中Fe代谢相关梭菌属(Clostridium)主导的自养反硝化在共混系统脱氮过程中可能发挥着重要作用.展开更多
基金Supported by the Grant PN-II-PT-PCCA-2011-3.1-1268 authorized by The National Council for Scientific Research-Executive Unit for Financing Higher Education,Research,Development and Innovation(CNCS-UEFISCDI)
文摘The glucose mass transfer in the biosynthesis of succinic acid with immobilized Actinobacillus succinogenes cells has been comparatively analyzed for a bioreactor with mobile bed vs. a stationary basket bioreactor. The process has been considered to occur under substrate and product inhibitory effects. The results indicated that the bioreactor with mobile bed is more efficient for biocatalyst particles with a diameter over 3 mm, while the basket bioreactor is more efficient for smaller biocatalyst particles and basket bed thickness below 5 mm. The performances of both configurations of immobilized A. succinogenes cell beds were found to be superior to the column packed bed bioreactor.
文摘针对污水处理厂深度脱氮需求,选用黄铁矿(FeS_(2))和聚羟基丁酸戊酸酯(PHBV)两种材料,构建应用于污水处理厂二级出水深度脱氮的反硝化生物填充床,通过进出水水质监测、材料结构表征(扫描电镜)、高通量测序等技术手段,探究了FeS_(2)-PHBV协同自养-异养反硝化体系的工艺运行效果及机理.结果表明,FeS_(2)-PHBV协同反硝化体系脱氮速率优于单独FeS_(2)自养体系,当水力停留时间为2h时,脱氮效率为90%以上,且产生更少的硫酸盐副产物.相比于单独PHBV异养体系,协同体系在达到相同总氮去除效果的同时释放更低的DOC(23.62mg/L).FeS_(2)-PHBV协同体系中两种材料表面结构均较利用前发生了显著变化,这是由于材料表面生物膜的富集和利用.共混反应器内优势菌群为厌氧发酵菌属(Sporomusaceae)和梭菌属(Clostridium sensu stricto 7),两者实现了共混体系异养-自养的协同反硝化效果,其中Fe代谢相关梭菌属(Clostridium)主导的自养反硝化在共混系统脱氮过程中可能发挥着重要作用.
