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Imazethapyr and imazapic are widely used in South Brazil to control weeds in rice fields, mainly through agricultural aviation. The environmental legislation requires that agricultural aviation companies have environmental licensing, which implies that the effluent treatment system must be compliant with the regulations of the Brazilian Ministry of Agriculture, which advises the use of an ozone-based...
In this study, the optimum conditions, the decolorization rate and the possible degradation mechanism were explored for the degradation of Acid Red B by the combined technology of ozonation and high voltage pulsed discharge (HVPD). The results suggested that the decolorization rate of the Acid Red B fitted the pseudo-first-order kinetics with initial dye concentration. The optimum ozone dose and pH...
With di-n-butyl phthalate as the model pollutant and Ru/Al2O3 as catalyst, this paper systemically investigates the removal of DBP in system. Our results have confirmed that Ru/Al2O3 can significantly increase the effect of ozonation. DBP removal in 30 min can reach 96% while only 55% with ozone alone. Efficiency is affected by the ozone dosage, initial concentration of reactants, RuCl3 concentration,...
The ozonation of three organ phosphorus pesticides, malathion, diazinon and dimethoate, was conducted in water. The influence of the concentration of ozonated water, ozone action mode, degradation time and ion scavenger was discussed. The three organ phosphorus pesticides could bed gradated completely in 15min by bubbling ozone in water. And additional ion scavengers could increase the degradation...
The ozonation of three chloronitrobenzene isomers (p-, m-, o-chloro-nitrobenzene, CNB) were investigated. CNBs was effectively degraded by ozone but cloud not be mineralized completely. During the ozonation of CNBs process, the inorganic carbon, Cl- and NO3- increased gradually, and chloro-(-Cl) and nitro-(-NO2) group all turn to Cl- and NO3- calculated by stoichiometry. The degradation products of...
Using dimethyl phthalate (DMP) as a phthalic acid esters (PAEs) probe, two candidate processes, ozonation (O3) and O3 combined with ultraviolet radiation (O3/UV), were evaluated for their efficiency in removing DMP and mineralizing the degradation products. The DMP degradation intermediates and final products were determined by capillary electrophoresis (CE). The results showed that the removal of...
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