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摘要
In this study，the influencing factors of ozonation treatment of printing and dyeing wastewater were carried out，and the free radical species，degradation products and succinate dehydrogenase activity were measured. results showed that the aniline removal efficiency decreased with the increase of pH，and increased with ozone dosage，respectively. the aniline removal efficiency was the highest at ozone concentration of 24 mg·L-1. The suitable condition for ozonation of aniline was pH 7.0，24 mg·L-1，200 mg·L-1，and 4 mg·min-1. At this time，the removal efficiency of aniline was 47.2%. Ozonation of aniline was a reaction process of direct oxidation with hydroxyl radical. After deamination of aniline and the cleavage of benzene ring，glutaric acid or L-pyroglutamic acid was generated until mineralization. The enzyme inhibition rate of E. coli. in raw water and ozonated wastewater were 83.4% and 24.7%，respectively. After ozonation pretreatment，the removal efficiency of chroma，SS，COD，TN，TP，sulfide，and aniline through coagulation increased by 0.72%，0.46%，31.40%，9.40%，22.80%，31.40% and 63.30%，respectively. This study provided a basis for the application of ozonation in printing and dyeing wastewater treatment. ? 2022 Science Press.
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