ELECTRON BEAM ACCELERATOR APPLICATION ON ENVIRONMENTAL RECOVERY

摘要

The necessity to decrease the environmental contamination caused by toxic flue gases, liquid and solid effluent delivered by industries, have resulted in search of new treatment technologies. The oxidation processes with OH radicals are the most efficient to mineralize organic compounds, and there are various methods to generate OH radicals as the use of ozone, hydrogen peroxide and ultra-violet radiation (AOP - Advanced Oxidation Process). The most simple and efficient method for generating OH radicals in situ is the interaction of ionizing radiation with water. The irradiation of aqueous solutions with high-energy electrons results in the excitation and ionizing of the molecules and rapid (10~(-14)- 10~(-9) s) formation of reactive intermediates. The most reactive species are the reducing radicals solvated electron (e_(aq)~-), and H atoms and the oxidizing radical hydroxyl, OH, the unique process that produce the reducing specie e-_(aq) is the electron beam irradiation These reactive species will react with organic compounds present in industrial effluent inducing their decomposition. The primary products from water irradiation tend to react with the functional groups present in an organic molecule rather than with the molecule as a whole. For these investigations, IPEN has one Electron Beam Accelerator from Radiation Dynamics and the gamma source Gammacell type. This paper presents the evaluation of ionising radiation effectiveness in actual effluents from different industries such as chemical, petroleum, wastewater treatment plant, and drinking water. The ionising radiation was efficient on destroying Geosmin (GEO) and Metilisoborneol (MIB) from drinking water, and organic compounds delivered in industrial effluents mainly chloroform, dichloroethane, methyl isobutyl ketone, benzene, toluene, xylene and phenol, independent on the physical-chemical characteristics and origin.