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The high concentration of ammonium chloride in the wastewater from the precipitation of rare earth carbonate was studied by an electrolytic method in this paper. The decomposition rate of ammonium chloride is obtained by electrolysis experiment, and the main components of wastewater can be transformed into raw and auxiliary materials that can be reused in the rare earth smelting process, so as to achieve the purpose of treating rare earth carbonate precipitation wastewater and provide a new method for the treatment of rare earth carbonate precipitation wastewater. The principle of the electrolysis process is analyzed in this study, and the optimum electrolysis factor is determined by the condition experiment. The changes in membrane materials and electrode materials before and after use are discussed. The experiments of stripping ammonia water and the reaction conditions of the formation experiment of ammonium bicarbonate are studied. The rare earth carbonate precipitation wastewater with the initial ammonium chloride concentration of 50 g/L was electrolyzed. The concentration of ammonia chloride was reduced to 3.5 g/L after electrolysis, and the electrolysis rate exceeded 90%. The purity of the ammonium chloride after electrolysis could exceed 93%. No industrial reagent was introduced in the electrolysis process, and no other pollutants were produced. [ABSTRACT FROM AUTHOR]

Theeffect of several parameters, such as peak voltage, frequency,and geometry, on the NO removal efficiency and energy utilizationefficiency of a dielectric barrier discharge (DBD) reactor has beeninvestigated in this work. NO removal efficiency and specific inputenergy (SIE) was augmented with the increase of voltage from 2.5 kVto 6.5 kV. For a given voltage, the maximum of NO removal efficiencyand SIE were attained at resonance frequency. Single-dielectric DBDreactor with a discharge gap of 3.5 mm obtained the highest dischargepower and NO removal efficiency. The energy utilization efficienciesof different DBD reactors were also compared. [ABSTRACT FROM AUTHOR]