A high - efficient ammonia - degrading strain DA - 1 was isolated from the anaerobically digested wastewater, and it was identified as Arthrobacter arilaitensis by 16S rDNA sequence analysis. Under the conditions of different carbon sources, C/N ratios and ammonia concentrations, the ammonia degradation ability of DA - 1 was studied. The results showed that: when the C/N ratio was 10 and the inoculation amount of DA - 1 was 1% (v/v) , the degradation rate of 100 mg/L ammonia by this strain could exceed 80% within 2 days. Along with the increase of the ammonia concentration, the ammonia degradation rate decreased, when the ammonia concentration was up to 1000 mg/L, the degradation rate decreased to 26. 3%. The ammonia degradation ability of DA - 1 to the anaerobically digested wastewater samples was also investigated by regulating C/N ratio with ethanol, the ammonia concentration of the anaerobically digested wastewater sample was decreased by over 70% after being treated for 5 days.%一株高效的氨氮降解菌株DA-1从沼液中分离,16S rDNA序列分析将其鉴定为Arthrobacter arilaitensis.实验研究了不同碳源、C/N比及氨氮浓度对菌株DA-1氨氮降解性能的影响.结果表明:多种有机碳源条件下,当C/N比为10、菌液接种量为1％ (v/v)时,在2d内,菌株DA-1的氨氮降解率达到了80％以上(100 mg/L),随着氨氮浓度的上升降解率随之下降,当氨氮浓度高达1000 mg/L,降解率下降至26.3％.实验还考察了菌株DA-1对沼液样品的氨氮降解能力,通过添加乙醇调节沼液的C/N比,处理5d后,沼液样品的氨氮浓度下降了70％以上.
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