Abstract:

By using the method of light irradiation in the biofilm system, we investigated three kinds of bioactivity inhibitors with different inhibitory effect on generation of H₂O₂ and degradation of typical organic pollutants of sodium dodecyl benzene sulfonate (SDBS) in natural biofilm/water simulation systems. The results show that inhibitors of photosynthesis and respiration have a significant inhibitory effect on the generation of H₂O₂ and degradation of SDBS, and the inhibitory effects of both of them are almost the same. The photo expiration inhibitor has little or no effect on the generation of H₂O₂ and degradation of SDBS. Therefore, the biological photosynthesis is the main reason for the generation of H₂O₂ and other reactive oxygen species, as well as the degradation of organic pollutants. Whereas, the contribution of other physiological role is relatively small.

Key words: sodium dodecyl benzene sulfonate (SDBS), biofilm, visible light, bioactivity inhibitor