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Health, Safety, Green, Environmental protection

Microorganism can transfer and transform the tetrabromobisphenol A in environment


Date:

2017-06-01

Tetrabromobisphenol A (TBBPA) is an important brominated flame retardant, widely used in synthetic resins, polycarbonates, plastics, electronic product casings, integrated circuit boards

Tetrabromobisphenol A (TBBPA) is an important brominated flame retardant, widely used in synthetic resin, polycarbonate, plastic, electronic products shell, integrated circuit boards, textiles and other products to prevent the occurrence of fire. TBBPA may diffuse into the environment in the presence of TBBPA in environmental media such as the atmosphere, water bodies, sediments and soils as well as in animals and humans during the production, use, dismantling and recycling of these products. TBBPA is ecotoxically and bioaccumulative and has a biological and human health hazard when it comes into contact with the organism in the environment and accumulates to a certain extent. Therefore, it is one of the important environmental problems to study the migration and transformation of TBBPA in the environment and reduce its environmental risk.

Tetrabromobisphenol A has the characteristics of large octanol-water partition coefficient, low water solubility, lipophilicity and thermal stability, and is easy to accumulate in river sediments. Microbes can degrade TBBPA in TBBPA, and in water, soil, sediments, both aerobic and anaerobic conditions. The removal of TBBPA in river sediments mainly relies on biodegradation under anaerobic conditions. The microorganisms that can degrade TBBPA under aerobic conditions are isolated and cultured in river sediments. The biodegradation of TBBPA is divided into two stages. In the anaerobic stage, TBBPA is reduced by bromide to bisphenol A (BPA), and BPA is further degraded by microorganism in aerobic stage. The anaerobic de-bromination of TBBPA is related to the process of methane production or sulfate degradation. In the past, 24 TB plants were found in 26 sewage treatment plants in Switzerland, and TBBPA was detected in 15 of the 17 sewage treatment plants in Spain. In the laboratory and sewage treatment plant activated sludge anaerobic digestion process also found TBBPA degradation. At present, there is little concern about the migration and transformation of TBBPA in the process of denitrification and dephosphorization, and the ecological security of such emerging pollutants will be an important object of future water environment safety control. Therefore, the study on TBBPA in the biological nitrogen and phosphorus removal process migration and transformation, will be such emerging pollutants in the sewage treatment process to provide scientific basis and reference.

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