Evaluation And Optimization Of TBBPA Degradation Based On Toxicity Process

Tetrabromobisphenol A as the current biggest production and usage of the bromide flame retardants, posed a threat to human health and ecological environment, with persistent, cumulative and biological toxicity characteristics. At present, the research on TBBPA mostly use the traditional water quality evaluation method, which can only measure the content of pollutants, can not reflect the comprehensive effect and long-term effect on the environment directly. Biological toxicity test can reflect the effect of pollutants on the ecological environment and human health, as an effective method of environmental monitoring and management, and the combination of different types of biological toxicity experiments can forme a comprehensive toxicity evaluation index potential ecotoxic effects probe which can evaluate the potential ecological risks of the pollutants systematically and comprehensively. In this paper, the comprehensive toxicity evaluation index and the removal efficiency of TBBPA were combined, to evaluate and optimize the process of potassium ferrate oxidation and ozone oxidation, which both can remove TBBPA efficiently.The toxicity change regulation of the TBBPA removal process by potassium ferrate on different conditions was researched through static experiment, the results show that: the acute toxicity and chronic toxicity change regulation of the reaction process of potassium ferrate remove TBBPA was volatility increases first and then decrease; the genotoxicity by Ames test has no genotoxicity at genetic level. Combined with the PEEP index and the TBBPA degradation rate, the optimum reaction conditions of potassium ferrate oxidation was: potassium ferrate concentration 0.15 mg/L, pH of 7 or 8, the temperature is 25 ?, reaction time 60 min.The acute toxicity change regulation of the reaction process of ozone remove TBBPA was basically the same as the reaction process of potassium ferrate remove TBBPA, the chronic toxicity change regulation was reduce volatility, the genotoxicity by Ames test has no genotoxicity at genetic level as well. Combined with the PEEP index and the TBBPA degradation rate, the optimum reaction conditions of ozone oxidation was: ozone concentration 0.15 mg/L, pH of 6, the temperature is 10 ?, reaction time 60 min.Combined with the PEEP index and the TBBPA degradation rate to compare and evaluate the potassium ferrate oxidation and ozone oxidation. The results show that: under the optimum reaction conditions, the potassium ferrate oxidation and ozone oxidation both can remove TBBPA completely, the ozone oxidation has a better effect on the comprehensive toxicity reduction, the PEEP index is 1.64 at the end point of reaction, the comprehensive toxicity can be reduced from slightly toxic to non-toxic. On the same molar ratio oxidant conditions, the potassium ferrate oxidation is better on TBBPA removal effect, but the ozone oxidation is slightly better on the effect of comprehensive toxicity reduction.