[Accumulation and biodegradation of anthracene by Chlorella protothecoides under different trophic conditions]

The bioaccumulation and degradation of anthracene by the green alage(Chlorella prothecoides) under autotrophic and heterotrophic conditions were studied. About 29% and 20% of anthracene(original concentration 1.0 mg.L-1) were degraded by light and by Chlorella protothecoides under the autotrophic condition, respectively. About 33.53% of anthracene (original concentration 2.5 mg.L-1) were degraded by C. protothecoides under the heterotrophic condition. The resistance and degradation ability of C. protothecoides under the heterotrophic condition was higher than that under the autotrophic conditions. More than 80% of residual anthracene was accumulated by algal cell under the two conditions. The bioaccumulation factor were 9064 and 1899, under the autotrophic and heterotropnic conditions, respectively. The net accumulation of anthracene, however, was much higher under the heterotropnic condition (202.29 micrograms) than that under the autotrophic condition (69.687 micrograms).