异养硝化细菌Alcaligenes sp.S3除氮特性及动力学

从湘江生活污水排污口分离纯化的一株菌Alcaligenes sp.S3,在氨氮浓度为400 mg/L时,经过192 h的降解,氨氮的去除率达到88%,并且NH2OH和NO2--N并没出现积累。在对不同浓度的氨氮进行一级动力学拟合时发现,只有氨氮浓度较高时才很好地符合,浓度为500 mg/L时R2达到0.9923。酸性环境对Alcaligenes sp.S3生长有抑制作用,在pH7.5～10生长较好。摇床转速对Alcaligenes sp.S3除氮影响不大,C/N过低或过高对Alcaligenes sp.S3除氮都有影响。

Character of ammonia removal by heterotrophic nitrifying bacteria Alcaligenes sp.S3 and its kinetics

A stain heterotropic nitrifier Alcaligenes sp.S3 was isolated from drain outlet of domestic sewage of Xiangjiang River.After 192 hours incubation,the removal rate of ammonia nitrogen by Alcaligenes sp.S3 was 88%,with the initial concentration of 400 mg/L,and the NH2OH and NO-2-N were not accumulated.When fitting with fist-order kinetics at diffrent concentrations of ammonia nitrogen,the removal rate of ammonia nitrogen was fitted better only at higer concentration,such as 500 mg/L,with the R2 of 0.9923.Alcaligenes sp.S3 grew badly in acidic environment,and grew well at pH of 7.5~10.The shaker speed had little effect on the removal efficiency of ammonia nitrogen,but the C/N ratio had great influence on the removal efficiency.