高铁酸盐去除四溴双酚A及中间产物特性研究
发布时间：2019-06-12 11:24
【摘要】：四溴双酚A(TBBPA)作为全世界使用量最大的溴化阻燃剂,在河流、土壤等自然环境中都有所检出。TBBPA因广泛存在且对人体具有各种毒害作用,已有学者对其去除方法进行了研究,但大多数处理方式存在处理效果不佳的问题。高铁酸钾对难降解有机物有高效氧化脱除和絮凝作用,对TBBPA的去除方面具有潜在应用价值。本课题在高铁酸钾去除TBBPA规律研究的基础上,探索去除过程中间产物的生成特性,并最终通过强化、联用工艺对TBBPA进行高效、无害化去除。通过配水试验,考察高铁酸钾去除TBBPA的规律,试验结果表明:增加高铁酸钾投加浓度、减少初始TBBPA浓度、p H为酸性有利于高铁酸盐去除TBBPA,而在50℃的温度范围内,TBBPA去除率随文呈现先升高后降低的规律,在温度为30℃时达到最佳去除效果。考差了TBBPA存在水体中常见共存离子对高铁酸钾去除TBBPA的影响,结果表明,Fe~(3+)、Cu~(2+)、Cl~-、和SO_4~(2-)的存在有利于去除TBBPA,而HCO3-、NH4+和腐殖酸对TBBPA的去除有一定的阻碍作用。高铁酸钾去除TBBPA过程中急性生物毒性呈先升高后降低的变化规律,推测在该过程中生成了中间产物从而引起了急性生物毒性的升高。为了解高铁酸钾去除TBBPA过程中急性生物毒性变化的原因,对高铁酸钾去除TBBPA过程中生成的中间产物,包括无机和有机中间产物两方面进行了研究。无机中间产物方面,高铁酸钾去除TBBPA的过程中,不产生溴酸盐;溴离子的生成量与TBBPA的去除情况呈正相关关系;但在TBBPA基本完全脱除时,无机溴的脱除率依然很低。有机中间产物方面,通过进行定性研究,确定了去除过程中有机中间产物的种类,主要物质有双酚A和二溴苯酚;并推测出TBBPA的主要去除路径:脱溴反应和C-C键的断裂。最后以二溴苯酚的生成、急性生物毒性和去除规律为例对中间产物进行特性研究,进一步证明了有毒中间产物的生成是引起TBBPA去除过程急性生物毒性升高的原因。基于以上研究,为了达到对TBBPA良好去除的基础上,进一步提高脱溴率,控制中间产物和急性生物毒性的目的,通过对高铁酸钾氧化工艺、高铁酸钾强化工艺、高铁酸钾/臭氧联用工艺与高铁酸钾/过氧化氢联用工艺对比优选,表明高铁酸钾/臭氧联用工艺在对TBBPA完全去除的同时,脱溴率达89.9%,发光细菌衰减率仅为2%,推荐使用高铁酸钾/臭氧联用工艺对TBBPA进行去除。
[Abstract]:As the most widely used brominated flame retardant in the world, tetrabromobisphenol A (TBBPA) has been detected in rivers, soils and other natural environments. TBBPA has been widely existing and has various toxic effects on human body, and its removal methods have been studied by some scholars, but most of the treatment methods have the problem of poor treatment effect. Potassium ferrate has high efficiency oxidation removal and flocculation effect on refractory organic matter, and has potential application value for TBBPA removal. On the basis of the study on the removal of TBBPA by potassium ferrate, the formation characteristics of intermediate products in the removal process were explored, and the TBBPA was removed efficiently and innocuously by strengthening and combining the process. The removal of TBBPA by potassium ferrate was investigated by water distribution test. The results showed that increasing the concentration of potassium ferrate and reducing the initial TBBPA concentration, p H was beneficial to the removal of TBBPA, by ferrate. In the temperature range of 50 鈩，
本文编号：2497983
[Abstract]:As the most widely used brominated flame retardant in the world, tetrabromobisphenol A (TBBPA) has been detected in rivers, soils and other natural environments. TBBPA has been widely existing and has various toxic effects on human body, and its removal methods have been studied by some scholars, but most of the treatment methods have the problem of poor treatment effect. Potassium ferrate has high efficiency oxidation removal and flocculation effect on refractory organic matter, and has potential application value for TBBPA removal. On the basis of the study on the removal of TBBPA by potassium ferrate, the formation characteristics of intermediate products in the removal process were explored, and the TBBPA was removed efficiently and innocuously by strengthening and combining the process. The removal of TBBPA by potassium ferrate was investigated by water distribution test. The results showed that increasing the concentration of potassium ferrate and reducing the initial TBBPA concentration, p H was beneficial to the removal of TBBPA, by ferrate. In the temperature range of 50 鈩，
本文编号：2497983
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