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  • 孙涛,唐顺,杨琦,尚海涛.自养反硝化菌对硝酸盐氮去除动力学及影响因素研究[J].环境工程学报,2009,3(11):1943-1946.DOI:    [点击复制]
  • Sun Tao,Tang Shun,Yang Qi,Shang Haitao.Removal of nitrate by supported autotrophic denitrifiers[J].,2009,3(11):1943-1946.DOI:   [点击复制]
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自养反硝化菌对硝酸盐氮去除动力学及影响因素研究
孙涛, 唐顺, 杨琦, 尚海涛
0
(中国地质大学(北京)水资源与环境学院,北京 100083)
摘要:
为更经济有效地去除污水中的硝酸盐,从兼性污泥中分离获得6株能氧化单质硫和还原硝酸盐的自养反硝化菌。根据各菌株的降解曲线筛选出优势菌种N-I,并研究影响菌株N-I降解性能的环境因素,如pH、温度、碳源及硝酸盐的降解动力学。实验表明,菌株N-I对硝酸盐的降解符合一级反应动力学方程,反应的半衰期t1/2为1.42 h,反应速率常数为0.488 h-1。最佳反应pH=7,最佳反应温度为30℃,最佳NaHCO3浓度为大于或等于2.5 g/L。
关键词:  自养反硝化  硝酸盐  动力学
DOI:
投稿时间:2008-11-11修订日期:2009-02-15
基金项目:国家自然科学基金资助项目(40102027,50578151);北京市自然科学基金资助项目(8052017,8092025);北京市教委校企合作项目(51900265005)
Removal of nitrate by supported autotrophic denitrifiers
Sun Tao, Tang Shun, Yang Qi, Shang Haitao
(School of Water Resources and Environment, China University of Geosciences, Beijing 100083,China)
Abstract:
In order to find a more effective and economical way to remove nitrate in wastewaters,six kinds of autotrophic denitrifying bacterial strain,which could oxidize elemental sulfur and reduce nitrate,were screened from facultative sludge.The strain N-I was the dominant strain according to the degradation curve of each strain.The environmental factors,including pH,temperature and carbon source,which had great influence on the degradation of strain N-I and the degradation kinetics of nitrate were investigated.Through a series of studies,the removal of nitrate by strain N-I conformed to first order reaction kinetics equation with a half-life of 1.42 hours and rate constant of 0.488 h-1.The optimum reaction conditions were obtained as follows:a neutral pH of 7,30℃ and concentration of sodium bicarbonate greater than or equal to 2.5 g/L.
Key words:  autotrophic denitrifiers  nitrate  kinetics