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。
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.
出处
《环境工程学报》
CAS
CSCD
北大核心
2009年第11期1943-1946,共4页
Chinese Journal of Environmental Engineering
基金
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)
关键词
自养反硝化
硝酸盐
动力学
autotrophic denitrifiers
nitrate
kinetics
