The Application Of Fe₇₈Si₉B₁₃ Amorphous Alloy In The Treatment Of Simulated Oily Wastewater

In recent years,with the continuous development of oil exploration,oil pollution in the water has been continuously aggravated,which has a serious impact on the water environment.Oily wastewater is a type of wastewater that contains high levels of chemical oxygen demand?COD?and refractory pollutants.Nowadays,more and more oily wastewater treatment methods have been developed,especially the Fenton method.However,it is revealed that these methods have a series of restrictions.Amorphous alloys have many potential applications in terms of magnetism,mechanics and catalysis due to their special arrangement of atoms.In the existing research,the application of Fe-based amorphous alloy in wastewater treatment has solved the problem of slow reaction of zero-valent iron powder and opened up a new direction of the amorphous alloy as a functional material.Therefore,it is of great significance to study the treatment of oily wastewater by the Fe-based amorphous alloy to the degradation of high organic loading wastewater.In this dissertation,the effect of various factors on the removal of COD and oil content?O&G?and the reusability of Fe₇₈Si₉B₁₃3 amorphous alloy in wastewater treatment were studied by the Fenton-like process for the treatment of simulated diesel wastewater.Considering the high consumption of H₂O₂ in the Fenton-like process,Fe₇₈Si₉B₁₃amorphous alloy electrode was used as the electrode to treat the simulated diesel wastewater by the electro-Fenton method.COD removal rate and oil removal?O&G?removal rate were used as the monitoring indicators to further reduce the H₂O₂ consumption,thereby reducing the processing costs.The results showed that the degradation reaction of the simulated diesel wastewater which was treated with the Fe₇₈Si₉B₁₃3 amorphous alloy by the Fenton-like method conforms to the first-order kinetic reaction.Under certain experimental conditions,the COD and O&G removal rates could reach 80%and 84.6%,respectively.With the optimal conditions,the nature of Fe₇₈Si₉B₁₃3 amorphous alloy was maintained after being recycled for 3 times,showing its superior structural stability.The electro-Fenton process,in which the Fe₇₈Si₉B₁₃amorphous alloy was set as the anode and the graphite plate as the cathode,requires for the characteristics of acidic solution.This was consistent to the traditional Fenton process.Under the optimal conditions,after 100min electrolysis,the COD removal rate can be up to89.6%.The COD removal efficiency was increased with the increase of current density.The higher the initial COD or initial O&G concentration,the higher the reaction rate after 40minutes,and the higher COD or O&G concentration of the effluent.The amorphous nature of Fe₇₈Si₉B₁₃3 amorphous alloy was maintained after being reused for 4 cycles,and the COD removal rate of the same load of oily wastewater can reach 86.3%after 100min.Compared with the traditional Fenton method,the electro-Fenton method showed obvious superiority in reducing the consumption of H₂O₂ and the removal rate of pollutants.