Aiming at investigating the degradation of low concentration tetrabromobisphenol A (TBBPA) in water and toxicity controlling by ozone oxidizing technology

the degradation of TBBPA (concentration: 0.15 mg/L) was carried out by ozone reactor under different values of pH and different dosages of ozone. The variation and controlling of the acute

chronic toxicity

and genotoxicity of the samples during the reaction were investigated

the internal reasons of toxicity were analyzed

and the possible degradation mechanism was proposed. Results show that TBBPA could be completely degraded when pH is 7.0 and ozone dosage is 0.12 mg/L. At the beginning of the reaction

the acute and chronic toxicity increased rapidly

and it was mainly because of the production of more toxic organic intermediates. As the reaction proceeded

the toxic intermediates were further degraded

and both of the acute and chronic toxicities were effectively controlled and the toxicity was controlled more quickly and significantly with the increase of ozone dosage. When the dosage of ozone was 0.12 mg/L

the acute toxicity could be completely controlled within 20 min of reaction

and the chronic toxicity could be controlled to be 0.76 TU within 60 min. After the reaction

the acute and chronic toxicities of the water samples could meet the emission standard. During the reaction

the mutagenic ratios of the samples were all smaller than 2.0

which had no genotoxicity at the genetic level. The analysis of mechanism showed that the degradation of TBBPA by ozonation mainly included the reaction process of debromination

the beta scission

addition

dehydroxylation

methylation

and so on.