Treatment Of Landfill Leachate By Ozone-catalyzed Blast Furnace Dust-based Micro-electrolysis Fille

Landfill leachate is a complex and difficult to degrade wastewater,and traditional biological and physical-chemical methods cannot treat landfill leachate very well.Iron carbon micro-electrolysis can improve the biodegradability of wastewater significantly.It is increasingly being used to treat refractory wastewater.To improve the landfill leachate treatment efficiency,we prepared an iron carbon micro-electrolysis filler based on blast furnace dust（BFD）as raw material,which was used to treat landfill leachate under ozone-catalyzed conditions.Moreover,it was compared with different types of fillers in this paper.In order to further improve the treatment efficiency,an ozone-catalyzed micro-electrolysis coupled with ceramic membrane filtration system was constructed.The article determined the optimum raw material ratio and optimum iron to carbon ratio for filler preparation,and loaded the catalyst.It was investigated the elements changes before and after the filler sintered and reaction,and the reaction mechanism was explored using electrochemical and Electron spin-resonance spectroscopy（ESR）techniques.It provided a new idea for the landfill leachate deep treatment and the BFD resource recovery and reuse.Firstly,the optimum preparation parameters for blast furnace dust-based micro-electrolysis（BFD-IE）fillers were defined.The results showed that the best removal effect was achieved when the optimum raw material ratio（BFD/clay）was 1:1,the optimum Fe/C was 2:1 and 10%CuSO₄ solution was added.In the optimum preparation conditions,the waste leachate COD and NH₄⁺-N removal efficiency reached 60.5%and 45.7%respectively.In addition,XPS was used to characterize the filler before and after sintered,the Fe and Cu reduction in BFD was confirmed the method feasibility.Secondly,the ozone-catalyzed micro-electrolysis mechanism was analyzed in depth with electrochemical,XPS and ESR techniques.It was proved that the iron-carbon micro-electrolysis occurred in the system by electrochemical performance tests,which promoted electron transfer within the system.The XPS technique demonstrated that the main elements in the system are Fe⁰ and Cu⁰,both of which can activate the passivation layer by forming multiple micro-electrolysis and increased reactivity,thus improved the landfill leachate treatment efficiency.The ESR technique showed that the reactive radicals generated in the system are mainly·OH and·O₂^-.The excellent synergy between ozone-catalyzed and iron-carbon micro-electrolysis was further demonstrated by controlled experiments.The system with the ozone-catalyzed can take advantage of high chloride ion concentration in landfill leachate to achieve simultaneous NH₄⁺-N removal.Finally,an ozone-catalyzed BFD-Cu-IE filler-coupled ceramic membrane filtration system was constructed,and 3D-EEM and particle size distribution techniques were used to reveal the mechanism of ozone-catalyzed micro-electrolysis to mitigate membrane fouling.It can significantly degrade large particles in landfill leachate into small particles,reduced the amount of membrane interception in landfill leachate and reduced the blockage of membrane pores caused by large particles,which lead to mitigated membrane fouling.