基于生物毒性的四溴双酚A降解工艺评价及优化
发布时间：2018-09-09 18:27
【摘要】：四溴双酚A(Tetrabromobisphenol A,TBBPA)是目前全球用量较大的溴化阻燃剂,具有持久性毒性、难以降解的特点,会对生态环境和人类健康造成难以逆转的危害。虽然,目前针对TBBPA的降解技术已有较多的研究,然而大部分研究仅局限于TBBPA的去除,对于降解产物可能存在的毒性方面的研究相对较少,且往往仅采用单一毒性检测方法,多为急性毒性检测,缺乏慢性毒性、遗传毒性等方面的研究,难以较全面评估污染物的毒害效应。而将以上不同类型的毒性检测方法结合起来,可形成综合毒性评价指标潜在生态毒性效应指数(potential ecotoxic effects probe,PEEP),该指标能够较全面对污染物的毒害效应进行评估。本文中将综合毒性评价指标与理化指标相结合,对目前研究中对TBBPA去除效果较好的高铁酸钾氧化法和臭氧氧化法去除TBBPA过程中的综合毒性变化规律进行研究,结合TBBPA的降解效率,评价并优化处理工艺。通过配水试验,研究了不同反应条件下高铁酸钾去除TBBPA过程中的毒性变化规律,结合TBBPA去除率对反应条件进行优化。结果表明,高铁酸钾去除TBBPA反应过程中,急性毒性和慢性毒性基本均呈先波动升高后降低的趋势;遗传毒性通过Ames试验检测,不具有致突变性,即不具有基因水平的遗传毒性。将各项毒性检测指标转化成为综合毒性评价指标PEEP,结合PEEP和TBBPA降解率,高铁酸钾氧化法去除0.15 mg/L TBBPA时,最佳反应条件为:高铁酸钾投加量为0.15 mg/L,pH为7或8,温度为25℃,反应时间为60 min。臭氧氧化法去除TBBPA过程,急性毒性变化规律与高铁酸钾氧化法去除TBBPA过程中的急性毒性变化规律基本一致,慢性毒性呈波动降低的趋势,遗传毒性同样不具有基因水平的遗传毒性。将各项毒性检测指标转化成为综合毒性评价指标PEEP,结合PEEP和TBBPA降解率,臭氧氧化法去除0.15 mg/L TBBPA时,最佳反应条件为:臭氧投加量为0.15 mg/L,pH为6,温度为10℃,反应时间为60 min。结合TBBPA去除率和综合毒性变化,对高铁酸钾工艺和臭氧工艺进行了对比分析,结果表明:两种工艺分别在最佳反应条件下,均可完全去除TBBPA,臭氧工艺对综合毒性削减的效果优于高铁酸钾工艺,反应终点PEEP值为1.64,综合毒性可由微毒降低至无毒;两种工艺在相同摩尔比氧化剂条件下,高铁酸钾工艺对TBBPA的去除效果较好,但臭氧工艺对综合毒性的削减效果优于臭氧工艺。
[Abstract]:Tetrabromobisphenol A (Tetrabromobisphenol An TBBPA) is a large amount of brominated flame retardants in the world at present. It has the characteristics of persistent toxicity and difficult to degrade, which will cause irreversible harm to the ecological environment and human health. Although there have been many studies on the degradation technology of TBBPA, most of the studies are limited to the removal of TBBPA, and there are relatively few studies on the possible toxicity of degradation products, and only a single toxicity detection method is often used. Most of them are acute toxicity detection, lack of chronic toxicity, genetic toxicity and so on, so it is difficult to evaluate the toxic effect of pollutants comprehensively. Combined with the above methods, the potential ecotoxicity index (potential ecotoxic effects probe,PEEP) of the comprehensive toxicity evaluation index can be formed, which can evaluate the toxic effect of pollutants in a more comprehensive way. In this paper, the comprehensive toxicity evaluation index is combined with physicochemical index to study the comprehensive toxicity change rule of potassium ferrate oxidation method and ozone oxidation method in the process of removing TBBPA, which is the better removal effect of TBBPA in the present research. Combined with the degradation efficiency of TBBPA, the treatment process was evaluated and optimized. The toxicity of potassium ferrate in the process of TBBPA removal under different reaction conditions was studied by water distribution experiment. The reaction conditions were optimized by combining with the removal rate of TBBPA. The results showed that the acute toxicity and chronic toxicity increased firstly and then decreased in the process of removal of TBBPA by potassium ferrate, and the genotoxicity was not mutagenic by Ames test, that is, no genotoxicity at the gene level. The optimum reaction conditions were as follows: the dosage of potassium ferrate was 7 or 8 mg/L,pH, the temperature was 25 鈩，
本文编号：2233215
[Abstract]:Tetrabromobisphenol A (Tetrabromobisphenol An TBBPA) is a large amount of brominated flame retardants in the world at present. It has the characteristics of persistent toxicity and difficult to degrade, which will cause irreversible harm to the ecological environment and human health. Although there have been many studies on the degradation technology of TBBPA, most of the studies are limited to the removal of TBBPA, and there are relatively few studies on the possible toxicity of degradation products, and only a single toxicity detection method is often used. Most of them are acute toxicity detection, lack of chronic toxicity, genetic toxicity and so on, so it is difficult to evaluate the toxic effect of pollutants comprehensively. Combined with the above methods, the potential ecotoxicity index (potential ecotoxic effects probe,PEEP) of the comprehensive toxicity evaluation index can be formed, which can evaluate the toxic effect of pollutants in a more comprehensive way. In this paper, the comprehensive toxicity evaluation index is combined with physicochemical index to study the comprehensive toxicity change rule of potassium ferrate oxidation method and ozone oxidation method in the process of removing TBBPA, which is the better removal effect of TBBPA in the present research. Combined with the degradation efficiency of TBBPA, the treatment process was evaluated and optimized. The toxicity of potassium ferrate in the process of TBBPA removal under different reaction conditions was studied by water distribution experiment. The reaction conditions were optimized by combining with the removal rate of TBBPA. The results showed that the acute toxicity and chronic toxicity increased firstly and then decreased in the process of removal of TBBPA by potassium ferrate, and the genotoxicity was not mutagenic by Ames test, that is, no genotoxicity at the gene level. The optimum reaction conditions were as follows: the dosage of potassium ferrate was 7 or 8 mg/L,pH, the temperature was 25 鈩，
本文编号：2233215
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