气单胞菌（Aeromonas sp．D-4）降解LAS的研究

Aeromonas sp.D-4不能以LAS作为唯一碳源，它对LAS的利用是通过共代谢来完成的。LAS对D-4具有毒害作用，而且，起始LAS浓度越高，毒害作用越大。LAS的最大去除串与起始LAS浓度呈负相关。当起始LAS在40-120mg/L之间时，去除串较高；如果起始LAS在40mg／L左右，则去除率可达s096以上。研究还表明，Aeromonas sp.D-4纯培养对LAS的去除率(最大值84．97%)大于混合菌(最大值78．57%)。耗氧呼吸测定证实了Aeromonas sp.D-4对于LAS的共代谢和LAS对细菌的毒性，同时也证实了培养基中LAS的消失是细菌作用的结果。

A STUDY ON THE DEGRADATION OF LAS BY AEROMON AS SP. D-4

The degradation and utilization of the anionic surfactant LAS (Linear alkylbenzene sulfonate) by Aeromonas sp. D-4 were studied with flask shaking technigue. Results show that Aeromonas sp. D-4 cannot use LAS as sole carbon source directly, but it is able to utilize LAS through certain process during co-metabolism. LAS is toxic to D-4 and its toxicity appears to be higher when higher concentration of LAS is present in the medium. The maximum removal rete of LAS is negatively correlated with the initial concentration of LAS. When the initial concentration of LAS ranges 40-120 mg/l, comparatively higher removal rates can be obtained. And, in the experiment, over 80% of the pollutant was removed when an initial concentration of LAS was about 40 mg/1. Moreover, the removal rate (Max. 84. 97%) of pure culture of Aeromonas sp. D-4 was higher then hat (Max. 78.57%) of mixed bacterial culture.