氯氰菊酯降解真菌的筛选及其降解特性研究

用富集培养的方法从农药厂污水排放口的污泥中分离筛选到3株以氯氰菊酯为唯一碳源进行生长的真菌,分别命名为TS-203、TS-205和TS-306。经鉴定3株真菌分别属于土生曲霉组(Aspergillus terreus)、毛链孢属(M onilochaetes)和镰孢霉属(Fusarium)。分别测定了不同碳源、pH、培养温度及氯氰菊酯浓度对真菌生长量和降解能力的影响。结果表明,以氯氰菊酯为唯一碳源且浓度为50~150 mg/L,pH 6.0~8.0,培养温度30~40℃时,真菌的生长量较大,降解效果较好。本研究对氯氰菊酯农药残留的生物修复研究和应用具有十分重要的意义,可为今后治理氯氰菊酯残留污染提供参考。

Screening and degradation characteristics of cypermethrin degrading fungi

Using the method of enrichment culture, 3 cypermethrin-degrading fungi,with cypermethrin as sole carbon source,were isolated from sludge at sewage outlet of the pesticide factory and named TS-203, TS-205 and TS-306. The 3 fungal isolates were identified as Aspergillus terreus, Monilochaetes and Fusarium. The effects of different carbon sources, pH, temperature and cypermethrin concentration on fungal growth and biodegradation ability were determined. The results showed that the fungal growth and biodegradation rates were higher when cypermethrin was the sole carbon source with concentration of 50～ 150 mg/L, pH 6.0～8.0 and temperature 30 ～40 ℃. The study has the extremely vital significance for bioremediation of cypermethrin residue as well as its application, and has provided references for the residue pollution control of cypermethrin in the future.