Fe^(2+)(EDTA)-NO还原菌的固定化条件优化及还原性能  

Optimizing immobilization of Fe^(2+) (EDTA)-NO reducing microorganisms and their reduction performance

作　　者：荆国华[1] 孙亮[1] 周作明[1] 郑娜[1] 

机构地区：[1]华侨大学环境科学与工程系,福建厦门361021

出　　处：《化工进展》2009年第5期869-873,共5页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(20706022);福建省自然科学基金(D0610013)资助项目

摘　　要：采用海藻酸钠包埋驯化得到的优势还原菌,用于还原BioDeNOx工艺中吸收NO后形成的Fe2+(EDTA)-NO。最佳包埋条件为:海藻酸钠质量浓度4%,菌体质量浓度200mg/L,CaCl2质量浓度2%,包埋时间16h。此条件下制备的小球还原性能好,但机械强度不高,溶胀破裂现象严重。在此基础上,加入2%活性炭和4%硅藻土改良小球,并将制备的小球进一步用浓度0.02mol/L己二胺交联60min,得到的小球综合性能良好。与游离微生物相比,其还原性能、耐高温性和耐酸性也有较大程度提高。The optimum immobilization condition and the performance of the immobilized beads in reducing Fe^2＋ （EDTA）-NO was investigated. The beads embedded for 16 h with 4 % sodium alginate, 200 mg/L microorganisms and 2% calcium chloride had good performance in reduction ability. However, they had a low mechanical strength, and were easy to be ruptured and swelled. The mechanical properties of the immobilized beads were improved greatly by first adding 2% activated carbon and 4% diatomite into sodium alginate to embed the microorganisms, and then crosslinking the beads with 0.02mol/L hexanediamine for 60min. In comparison with free bacteria, the immobilized bacteria had a large improvement in reduction performance and resistance to high-temperature and acid.

关 键 词：NOx 固定化微生物 Fe2+(EDTA)-NO 还原菌 

分 类 号：X701[环境科学与工程—环境工程]