Degradation Properties Of Two Kinds Of Wastewater By Using Three Kinds Of Amorphous Alloys

Water is a necessity for life and economic development.Water pollution threatens seriously the survival of various species.A large amount of wastewater was discharged in the fields of dyeing,oil exploitation,which further cause serious pollution of water resource if it is treated not in time.As a kind of metal material,amorphous alloy shows a great advantage in treating various printing and dyeing wastewater due to its characteristics of high atomic energy state,good structure uniformity and corrosion resistance.It is note worthy that little research has been reported on the treatment of oily wastewater by using amorphous alloys up to now.At the same time,different amorphous types correspond to different methods in treating wastewater with high efficient.By using Fe-based,Al-based and Cu-based amorphous alloys,the degradation ability and degradation mechanism of simulated Direct Blue 6(DB 6)printing and dyeing wastewater and simulated oily wastewater was investigated with methods of Fenton,zero-valet metal reduction and electrolysis,etc.The decolorization efficiency and chemical oxygen demand(COD)removal are used to characterize the degradation capacity of printing and dyeing wastewater and oily wastewater,respectively.The Fenton reagent composed of Fe₇₈Si₉B₁₃amorphous ribbon has the characteristics of short treatment time and remarkable efficiency compared with the zero-valet metal reduction method in treating the DB 6 wastewater.Under the optimized process conditions,the decolorization efficiency can reach 99.91%in 30 min with the degradation efficiency constant of 0.160 min^-1,and the degradation mechanism of which is consistent with the traditional advanced oxidation method.The Cu₄₆Zr₄₅Al₇Y₂amorphous ribbon is used to degrade DB 6wastewater using reduction method.Under the optimized process parameters,the decolorization efficiency can reach 98.76%in 60 min.The degradation mechanisms are mainly corrosion in acidic conditions and reduction degradation of zero-valent metals.When Al₈₆Ni₁₀Y₄amorphous alloy is used as the anode and graphite as cathode,DB 6 dye wastewater can achieve good degradation efficiency in acidic and alkaline by electrochemical method,and the decolorization efficiency can reach 95.22%in 20 min.The main degradation mechanisms are electrolytic oxidation,electrolytic reduction and electrocoagulation.From the perspective of shortening the process flow and practical application,the electrochemical method is preferred for the degradation of DB 6 wastewater,when Al₈₆Ni₁₀Y₄amorphous alloy is used as the anode and graphite as cathode.In terms of increasing ribbon recycling times,zero-valent metal reduction method can be selected when Cu₄₆Zr₄₅Al₇Y₂amorphous alloy is used as a catalyst.Considering the best degradation efficiency,Fe₇₈Si₉B₁₃amorphous ribbon can be selected by Fenton-like method.The simulated oily wastewater is degraded by electrochemical method when Cu₄₆Zr₄₆Al₇Y₁,Al₈₆Ni₁₀Y₄and Fe₇₈Si₉B₁₃amorphous alloys are used as the anode and graphite as cathode respectively.By optimizing the current density,p H,electrolyte addition and the initial concentration of wastewater,the COD removal can reach 73.15%,75.68%and 91.24%respectively in 100 min.Compared with the electro-Fenton method,the COD removal of oily wastewater by Fenton-like method is only 82.23%,while the dosage of H₂O₂is increased by5.6 times.From the analysis of the degradation efficiency of three amorphous alloys on oily wastewater,Fe₇₈Si₉B₁₃amorphous ribbon has the highest COD removal by electro-Fenton method.