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硫化氢降解菌包埋条件及降解特性研究

Embedding Conditions and Degradation Characteristics of Combined Hydrogen Sulfide Degrading Bacteria
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摘要 筛选获得2株硫化氢(H2S)高效降解菌株(T3和B3),分别鉴定为根瘤杆菌属和人苍白杆菌属。采用改进的海藻酸钠(SA)-聚乙烯醇(PVA)对2株菌的混合液进行包埋,并对最佳包埋条件及包埋后的降解效果进行研究,结果表明:SA-PVA包埋的最佳条件:复合载体的配比为2%SA和7%PVA混合溶液;在1%氯化钙和4%硼酸混合溶液中交联24 h;制得粒径为2 mm左右的固定化凝胶小球;包菌量为0.3 g/L;在pH 5.0~10.0、温度为25~40℃时,固定化细胞对H2S具有较高的降解能力和抵抗性,当H2S浓度提高到700 mg/m3以上时,48 h后固定化细胞能达到93%以上的降解率,并且其重复脱硫能力明显优于游离态细胞,为工业应用提供了可能性。 Two hydrogen sulfide degrading bacteria(T3 and B3)isolated and identified as Rhizobium sp.and Ochrobactrum sp.were embedded with improved sodium alginate(SA)-polyvinyl alcohol(PVA),and the optimal embedding conditions and efficiency of degradation after embedding were studied.It was found that the optimal embedding condition was fixed on 2% SA and 7% PVA,24 h for cross-linking time in mixed solution of 1% calcium chloride and 4% boric acid,2~3mm for particle size of embedded cells,0.3 g/L of package bacteria.At pH 5.0~10.0,temperature 25~40 ℃,the immobilized cells had higher H2S degradation ability and better resistance to H2S than that in free-state cells.When H2S concentration was raised above 700 mg/m3,the removal rate of degrading bacteria can reach 93% after 48 h reaction.Its desulfurization ability was significantly higher than that in free-state cells,which would provide possibility for industrial applications.
出处 《环境科学与技术》 CAS CSCD 北大核心 2013年第1期25-30,共6页 Environmental Science & Technology
基金 国家"863"计划项目资助(2009AA062603)
关键词 硫化氢 高效降解菌 包埋条件优化 降解特性 hydrogen sulfide degrading bacteria optimization of embedding condition degradation
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