Aerobic biodegradation and biodiversity characteristics of low-concentration octylphenol
低浓度辛基酚的好氧生物降解特性和群落多样性

The biodegradation performance of octylphenol(OP) in low concentration by aerobic bacterial community and the involved microbial biodiversity were investigated in this study with batch tests.Experimental results showed that the first order kinetic constant at OP concentration of 200,100,50 μg · L-1 was 0.131,0.219 and 0.431 d-1 respectively,indicating that the microbial metabolism was depressed with high levels of OP.Alkaline condition of pH 8 was found to be most favorable for OP biodegration in the range of pH 5 to 9.Moreover,addition of organic compounds,such as methanol,glucose,phenol and yeast extract could improve the biodegradation of OP,with the most significant effect associated with phenol and yeast extract.The half-life of OP was shortened from 5.3 d to 3.2 d and 2.3 d,respectively,with initial OP concentration of 200 μg · L-1.The dominant bacterial species were found to be γ-proteobacteria,β-proteobacteria and firmicutes,which was different from the result obtained from alkylphenol ethoxylates biodegradation at high concentration.