Construction Of Foamed Nickel Composite Electrode And Experimental Study On Electrolytic Dechlorination Of Desulfurization Wastewater

The problem of water shortage has always been a major problem that plagues our country’s sustainable development.The development of advanced industrial wastewater treatment technology,zero discharge of wastewater and reuse of reclaimed water is an important way to solve the problem of water shortage in my country.Based on the national conditions that my country’s industrial composition is mainly based on manufacturing and processing industries,industrial wastewater treatment and resource utilization are particularly important.At present,the water consumption in the power industry accounts for one-fifth of the total industrial water consumption in my country,of which zero discharge of desulfurization wastewater is the focus of realizing zero discharge of wastewater in the power industry.Desulfurization wastewater has the characteristics of high chlorine,high salt and high heavy metals,which determines that it has become the most difficult part of water pollution in coal-fired power plants.At the same time,the traditional chemical precipitation method used in coal-fired power plants can only effectively remove salts and heavy metals,but the treatment effect of chloride ions is not obvious.Therefore,under the background of the country’s implementation of zero discharge of desulfurization wastewater from coal-fired power plants,the membrane electrolysis process,which can effectively remove chloride ions from water,relies on its energy-saving and high-efficiency,no secondary pollution,and by-product chlorine and hydrogen can be used as resources and other characteristics,is increasingly favored by the industry in the field of wastewater treatment.In this paper,aiming at the high cost of electrode equipment for chlorine electrolysis used in the traditional chlor-alkali industry,two new membrane electrodes with reliable performance and low cost were constructed,which realized the advanced treatment of high-chlorine desulfurization wastewater and the recycling of chlorine and hydrogen by-products.This topic mainly studies the influence rules and mechanisms of factors such as current density,electrolysis temperature,and types of active substances loaded on electrodes on dechlorination efficiency by configuring simulated desulfurization wastewater and using single-factor experiment method.The results show that the loading of polypyrrole on the porous carbon electrode and the loading of nickel hydroxide on the nickel foam electrode can promote the dechlorination reaction,and the best dechlorination efficiency can reach 91.2%when the electrolysis temperature is 25℃and the current density is 83.3 m A/cm~2.Compared with traditional ruthenium-iridium-titanium anode and platinum-titanium cathode,the cost of polypyrrole-porous carbon anode and foamed nickel-nickel hydroxide electrode is only 1/53 and 1/7.8 of the former two.The chlorine efficiency greatly reduces the cost of the electrode,and provides a good theoretical basis and technical support for the large-scale industrial application of electrolysis to treat high-chlorine desulfurization wastewater.