Treatment Of Ion Exchange Resin Wastewater By Catalytic Oxidation Biodegradation Coupling Process

Ion exchange resins have many characteristics and have been widely used.However,its production wastewater has high concentration,poor biodegradability,and difficulty in reaching treatment standards,which has been widely concerned.This article conducts in-depth research on the treatment of ion exchange resin production wastewater,and constructs a combined process of ozone catalytic oxidation and biodegradation.Through catalyst screening,research on the influencing factors of ozone catalytic oxidation and biodegradation conditions control,the process process and various processing units are optimized,and process parameters and conditions are proposed.At the same time,the mechanism of target substance removal in each process unit is studied through chromatographic analysis.The following conclusions were obtained through research:(1)Under the same experimental conditions,the catalytic characteristics have significant differences in the removal efficiency of COD from ion exchange resin wastewater.The screening test results of three types of catalysts for wastewater treatment(multi metal type catalysts,Mn/Al type catalysts,and Mn type catalysts)show that the multi metal type catalyst has the best effect.By studying the influencing factors of the catalyst,it was found that under the conditions of ozone concentration of 75mg/L,catalytic oxidation time of 70 minutes,and wastewater pH=8,the COD removal efficiency was optimal.(2)Ozone catalytic oxidation can significantly improve the biodegradability of treated wastewater while removing COD.BOD5/COD increased to 0.38,UV254 decreased to 0.2419.(3)The wastewater treated by ozone catalytic oxidation is further treated using the anoxic aerobic anoxic(AOA)process,and the COD of the effluent can be reduced to below 30mg/L.After 53 days of operation,the AO A biochemical reactor showed stable pollutant removal,with HRTs of 4 hours,12 hours,and 4 hours,respectively;Due to the concentration of NO3--N in the effluent after aerobic treatment being around 15 5mg/L,sodium acetate was added as a carbon source in the second stage anaerobic reactor.(4)Through chromatographic analysis,it was found that the types and quantities of organic compounds in wastewater significantly decreased after ozone catalytic oxidation,mainly converted into small molecular weight organic compounds such as aldehydes.The organic compounds containing characteristic functional groups such as O-H bonds,C=N bonds,and S=O bonds in the raw wastewater almost disappear,and the C=C bonds of olefins and aromatic rings also almost disappear.The remaining organic compounds are mainly composed of aldehydes and ketones with C-C single bonds.(5)A coupling process of ozone catalytic oxidation AOA biodegradation was constructed for ion exchange resin wastewater,and the main process parameters were proposed.Under suitable operating conditions,the removal rates of COD and ammonia nitrogen in wastewater by this process reach 95%and 97%,respectively.The COD and ammonia nitrogen concentrations in effluent are lower than 30mg/L and 5mg/L,respectively.