Influence Mechanisms And Control Strategies Of Bromate Byproduct Generation In Electro-heterogeneous Ozone Catalysis Process

Based on the advanced oxidation of ozone oxidation technology in repair containing bromine water,because the ozone has strong oxidation ability,through a series of hydroxyl free radical reactions in aqueous medium could quickly into bromate bromide ion by-products,thus controlling bromate by-products produced is an important task of advanced oxidation researchs.Electrical and ozone heterogeneous catalytic technology?E-catazone?is a new kind of ozone catalytic technology development in recent years.The technique combines ozone aeration,electrocatalysis and ozone polyphase catalysis by using a tubular porous aerator loaded with titanium dioxide nanoribbon as the anode and carbon coating as the cathode.As is known to all,bromide ions,as an important inorganic ionic pollutant,widely exist in groundwater,oil and gas exploitation water or other surface water.However,in previous studies,there has been no relevant research on the oxidation of bromide ions and bromide by-products in E-catazone.Therefore,this paper focuses on the study of the effects of different operating conditions?gaseous ozone concentration,current density?and water quality parameters?p H and co-existing anions?Cl^-,HCO₃^-,NO₃^-??on Br^-,HOBr/Br O^-and Br O₃^-conversion in E-catazone.Explore the influence mechanism and establish bromate control strategy.In the end,the kinetic model of bromine ion oxidation in E-catazone is studied.The main conclusions are as follows:?1?The influence of different factors on the generation of bromate in the E-catazone system were systematically studied and the control methods of inhibiting the generation of bromate were obtained:reducing the concentration of ozone in the gas phase could inhibit the amount of bromide by-products;When current intensity was increased above40 m A,bromate production could be inhibited.Water quality conditions with initial p H of 3 and 11 could effectively inhibit the production of bromate.When the initial solution contained 0-100 mg/L Cl^-,the bromate yield increased by 7%;when the initial solution contained 150 mg/L chloride ion,the bromate yield decreased by 16%,when the solution contained 0-100 mg/L Cl^-,the bromate yield decreased by 16%.The existence of HCO₃^-could promote the formation of bromate by-products.Co-existence anion NO₃^-could inhibit bromate production.?2?The basic element reaction kinetics model of E-catazone for bromine ion oxidation to produce bromate was established,and the conversion process of bromine substance was simulated and the law was analyzed,and the key speed limiting steps affecting bromate production were identified.The above results provided prediction and data support for effective control of bromate production.There are 59 figures,11 tables,and 73 references.