不同碳源对固定化反硝化菌脱氮的影响  

Study on denitrification using different carbon sources

作　　者：谭佑铭[1] 罗启芳[1] 

机构地区：[1]华中科技大学同济医学院环境医学研究所,武汉430030

出　　处：《卫生研究》2003年第2期95-97,共3页Journal of Hygiene Research

基　　金：国家自然科学基金资助项目 (No .39870 664)

摘　　要：为寻找较为经济、高效的有机碳源 ,分别外加葡萄糖、蔗糖、甲醇和乙酸 ,以研究它们对固定化反硝化菌脱氮的影响。结果表明 ,固定化反硝化菌能有效利用上述碳源 ,进行反硝化作用。其中采用葡萄糖、蔗糖和乙酸的反硝化速率较快。HRT为 6h时 ,脱氮率达 96%以上。若碳源较丰富 ,反硝化过程中的氨化作用并不明显 ,被转化成氨氮的硝态氮低于被还原总量的 5 %。采用固定化反硝化菌处理COD NO-3-N较低 ,且不外加碳源 ,起始浓度分别为 45 2和 2 4 6mg L的实际水样 ,分别经过 60h和 3 2h后 ,脱氮率达 90 %以上。In this study, bench scale tests were conducted to study the potentials of immobilized denitrifier to reduce nitrate in the presence of 4 different carbon sources: glucose, cane sugar, methanol and acetic acid. The results showed that the carbon sources can be used by the immobilized bacteria as exogenous carbon sources. While using methanol, the average denitrifying velocity was lower than the others. Dissimilatory reduction to ammonium was not significant and accounted for less than 5% of reduced nitrate. By a 6-hour hydraulic residence time, the denitrification rates were higher than 96%. The nitrate enriched water of S lake was also treated by the immobilized denitrifier to study the character of denitrification, especially on the using of natural carbon sources as electron donotor. The results showed that more than 90% of the nitrate in the water could be reduced by the immobilized bacteria, and more than 20% of the natural carbon sources in the water could be used by the immobilized cells.

关 键 词：反硝化 碳源 固定化细菌 

分 类 号：R123.6[医药卫生—环境卫生学]